a description of British Seagull Little Forty models and the differences with later Seagulls and the problem with parts.

Little Forty.

This page is dedicated to the Little Forty models.

In it I include the (F), FV, FVP, LM, and LS (The 'F' here is not to be confused with the 'F' of the later Featherweight. To date we have not found an original 'F', they only appear on the engine numbers sheet for the first year, 1949.) March 2007! Mike Williams in Australia has sent me some mobile phone pictures of a 1951 model 'F'!!! They did exist! Better pictures to follow we hope. Now, 2014, we have several and I have one at SOS!

All These models had radically different engine to drive shaft attachment, they were clamped, so should be easy to distinguish apart from the later motors. Sadly virtually none of the major parts are still available, so cannibalizing dead British Seagulls is often the only way to keep these running. When I say running, I do think it worth saying that these motors have now gone beyond there 'Use by' date and I would suggest they are mostly curios now. After all if you break it out there, you are not easily going to be able to repair it!

October 2017. Some hard to get parts are available!

Steel head and base plates, newly made in the correct thickness, limited number available £15.00 a set.

Little Forty thrust bobbins, newly made limited number available. £10.00 a pair.

The following table has been compiled by Jeremy Prince my thanks to him for this.

If you have a Little Forty and wish to add information to the register,

please contact Jeremy using the contact form. Please click the button below (opens a new tab)

Model			Serial Number	Carburettor				Tiller		Tank/Fuel Pipe								Magneto (Flywheel)							Propellor		Transom Bracket			Misc				Last Known Location/Date
Letter prefix			No.	Amal or Villiers. (No) Throttle Stop. (No) Hole in Choke Shutter. (No) Hole in Bowl				Stub or Tilting Length (inch). Dover Grip 3 long + 6 short Grooves. Grip 6S for later grip with 6 long grooves		Small Round/ Canted Oval. Looped or ‘U’ metal Fuel Pipe. Plastic Fuel Pipe (Black/Clear). Fuel cap:- Short/Tall Ears Narrow/ Wide Slot For LS:-Early 3/4" or late 7/16” rad ends.								Plain or In or For the World Cover. (Half) Rimless Baseplate Flywheel Date. 3453 Mag							3 blade 4 blade Clover-leaf For LS gearbox: Number of inlet Holes		4” depth Plated or Unplated. 5.4” depth Security Bar on Port side.			Original Decal. For F, FV&FVP:-1 or 2 piece Champion Plug Cap. OESL – Original Engine Support Lug. NESL – New Engine Support Lug. CBPH – Clamp Bolt Pump Housing.
F			100	From documents rescued from BS by John Williams, this would appear to have been the first engine of this series and was produced in 1949.
F			201	Amal*				S 5 DG3+6			SR SENS								P RB 10/48 3453 mag						3C		4”P ‘inside’			Small block- 40cc. 2pc Champion PC. ‘3453’ Mag				Gloucestershire
F			341	Amal				S 5			SR								P RB						3C		4”P*’inside			Small block- 40cc				Holland
The 40cc engines have a bore of approx 38mm with a stroke of approx 35mm. Up to S/No 1080 they have a small block with ¼” studs. Thereafter the F, FV and FVP have bigger blocks with 5/16” studs and a larger bore of 45mm. They retain the same stroke of approx 35mm to give a capacity of approx 55cc.
VF			1065	V 7/16TS NHC NHB				S 5 NS				SR LFP							P RB 10/49						3C		Later			Large Block				Uxbridge
F			1082	Amal				S 5 DG3+6				SR SENS							P RB 3453 mag						3C		4”P ‘inside’			Large Block Original decal Non webbed crankcase				Poole
FV			1146	V				S 5 DG 3+6				SR SENS							P RB 1/50						3C		4”P			Large Block Original decal Non webbed crankcase				Guildford
FV			1166	V 1/2TS				S 5				SR							P						3C					OD-Seagull				Dorset
F			1207	Amal				S 5 DG3+6				SR SENS							P RB 1/49 3453 mag						3C		4”P*			Large Block OD-Seagull. 2pc Champion PC. Non-webbed crankcase.				Gloucestershire
VF1325 was the last to be produced in 1949. F1326 was the first to be produced in 1950.																	The first and last serial numbers for each year are my interpretation of the data in the BS documents which John Williams has placed on the SOS site.
FV	1528			V				S				SR																						On e bay 4/14
FV	1580			V7/16NTS NHC NHB				S 5 NS Grip				SR LFP								P RB 1/50					3C		4”P			Non-webbed crankcase 2 pc Champion PC				Australia
FV	1585																													Scrap crankcase assy. Non webbed				Cirencester
FV	1623T																																	On e bay 4/16
FV	1740																																	Walton on the Naze
FV	1782			V				S				SR								LFP					3C		later							Glasgow
FV	1786			V 7/16TS NHC NHB				S 5 DG3+6				SR LFP SENS								P RB 12/49					3C		4”P			OD-Seagull 1 pc Champion PC. Non webbed crankcase				Gloucestershire
FV	1823																																	On e bay 6/18
FV	1867T			V 7/16TS NHC NHB				T 10 DG3+6				SR* LFP* SENS								P RB 12/49					3C		4”P			Webbed crankcase				Gloucestershire
FV	1884T							T Stub m/c off				SR LFP*																		Powerhead. Non webbed crankcase. T font is different				Bristol
FV	1958			-				S				-								-					-		-			Non webbed crankcase only - scrapped				Gloucestershire
FV	2091			V ½ NHC HB				S G 6S				SR LFP SEWS								In* RB					3*		?			Non webbed crankcase				New York
FV	2168			V 7/16				S												P RB 3/50										Corroded crankcase assy Non webbed crankcase				Gloucestershire
FV	2247																																	On e bay 6/18
FV	2265T			V 1/2TS				T 10				SR								P					3C		?			ODSeagull				Dorset
FV	2306			V 7/16TS NHC NHB				S 5				SR LFP SENS								P RB 3/50					3C		4”P			Non webbed crankcase				Gloucestershire
FV	2380			V 7/16TS NHC NHB				S 5				SR LFP SENS								P RB 5/50					3C		4”P			Non webbed crankcase				Gloucestershire
FV	2405T																																	Suffolk
FV	2461			V				S NS				SR LFP								P RB					3C		4”
FV	2549			V				S Long				Later PFP								F/In ?					4 Later		Later							Italy
FV	2682			V 7/16TS NHC NHB				S 5 DG3+6				SR LFP SENS								P RB 7/50					3C		4”P*			Non webbed crankcase				Gloucestershire
FV	2700T			V ½ TS NHC NHB				T 10				CO								P RB 7/50					3C		4” P			OD 1 pc Champion PC				Flintshire
FV	2723			V				S				SR LFP								P RB					3C		4”			Dismantled				Ashford
FV	2802T							T				CO																						On e bay Oct 2013
FV	2821			V 7/16TS NHC NHB				T 10* DG3+6				SR LFP SENS								P RB 7/50					3C		4”P*			ODSeagull Webbed crankcase				Gloucestershire
FV	2844			V NHC				S NS				SR NSFP								P RB					3C		4” P			NSESL Non webbed crankcase				W. Australia
FV	2886			V				S c10				SR LFP								P					3C		4”P							On SOS site
FV	2923			V				S NS				CO															4”P			Non webbed crankcase				Fife
FV	3048			V 7/16TS NHC NHB				S 5 DG3+6				SR								P RB 7/50					3C		4”P			Non webbed crankcase				Gloucestershire
FV	3302			V 7/16 TS NHC HB				SENS				SR LFP SENS								P RB 8/50					3C		4” P			Non webbed crankcase				W. Australia
FV	3364			V NHC				S 5 DG3+6				SR LFP								P RB					3C		4” P			2pc Champion PC. Webbed crankcase				Tasmania
FV	3481			V 1/2 TS				S Long				SR PFP								P RB					3C		4”P			Non webbed crankcase Previously Champion PC				Australia
FV	4105			V				S				SR LFP													3C		4”P							New Zealand
FV	4123T			V				T				CO LFP								P					3					Webbed crankcase				New Zealand
FV	4163			V				S 5 DG3+6				SR LFP SENS								P HRB 11/50					3C									New Zealand
FV4342 was the last to be produced in 1950. FV4343 was the first to be produced in 1951.
The FVP was introduced at about this point, FVP5090 being the first one to date, recorded on this list. The FVP was identical to the FV, except that it had the bigger 10:35 ratio gearbox with bigger prop, and longer drive and exhaust tubes. Also, probably about this time, the top crankcase was modified by the addition of a web above the cast aluminium tiller stub – no doubt to stiffen and thus enhance the crankcase sealing in that area.
FV		4520																												Non webbed crankcase				Australia
FV		4807																																UK
FV		5090		V 7/16TS				S 5						SR					P						3C		4”P			OD –Seagull				Holland
FVP		5131						S						SR					P															Holland
FV		5141		V 7/16TS NHC NHB				S 5 DG3+6						SR* LFP					P RB 2/51						3C		4”P			Webbed crankcase				Gloucestershire
FVP		5215T		V NHB				T						CO											3C					Webbed crankcase				UK
FVP		5425		V 7/16TS NHC NHB				S 5						-					P RB						3C		4”							Holland
FVP		5428		V 7/16TS NHC NHB				S 5											P RB						3C		4”			Stripped-not complete				Holland
FVP		5560		V 7/16TS NHB NHC				S 5*						SR LFP					P RB						3C		P 4”			Webbed crankcase				Hertfordshire
FVP		5608		V 7/16TS NHB				S 5*						SR LFP					P RB						3C		P 4”			Webbed crankcase				Hertfordshire
FVP		5750		V 7/16TS NHC NHB				S 5 No G						SR LFP SEWS					P RB 5/51						3C		4”P			Non webbed crankcase				Australia
FVP		5778		V 1/2				T NS						SR TEWS					P RB 1/51								Later			Been restamped EVR Webbed crankcase				Bristol
FVP		5813																												Webbed crankcase				Australia
FVP		5846						S											P											OD				W. Australia
FVP		5942		V NHC				NS T						SR SENS					For RB						3C					Webbed crankcase				Belfast
FV		5950		-				S						-					-						-		-			Webbed crankcase, Chromed crankcase support lug surface				Gloucestershire
FVP		5959		V TS				S Long						SR					P											Webbed crankcase. LS internals				Skye
FVP		5964						S						SR																Chromed crankcase support lug surface				On ebay 2/18
FVP		6046		V NHC				S 5						CO LFP					P RB						3C		Later							Maldon
FVP		6152		V NHC				T						CO					RB						3C		Later			Webbed crankcase				Fife
FVP		6189		V NHC HB				S						SR LFP					P RB						3C		4”P			Webbed crankcase Stripped and bits sold				Kent
FVP		6222		V				S & T						CO LFP													Later			Clutch gearbox				Australia
FVP		6284		Later V				S NS						NS Tank					P RB						NS 2H		Later			On e bay March 2017				Goole
FVP		6296						S						SR LFP SENS					P RB						3C 2H		4” P							Brisbane
FVP		6304		V TS NHC HB				S NS						SR LFP SENS					P RB						3C 2H									Yorkshire
FVP		6317		V TS				S5						SR PEP SENS					P RB						3C		4”P							Ripponden
FVP		6343		V ½ HB HC				S long G 6S						CO LFP TEWS					P 6/51						3C		4”P							New York
FV		6347		V				S Long						SR					RB						4C		Later?							On the web
FV		6353		V 7/16TS* NHC NHB				S 5* NS Grip						SR UFP					P* RB 6/51						3C*		4”P*			Webbed crankcase				Gloucestershire
FV		6400		V 7/16TS				S 5						SR					P						3C					ODSeagull				Dorset
FV		6405		V 7/16TS NHC HB				S5 DG3+6						SR LFP SENS					P RB 7/51						8” NS 3C 2H		4”P			Webbed crankcase Al impeller FVP prop				Jersey
FVP		6493						Integral cast T bracket																						Crankcase assy only. Later LS size c’case.				Gloucestershire
FV		6569		V 1/2TS				S 5						CO					P						4C					ODSeagull				Dorset
FV		6661						S						NS tank											3C									On e bay 5/19
FV		6798T		V				T						CO PFP											3C		4”P							You Tube
FVP		6842T																	7/51															Dorset
FVP		6870		V				T						NS tank? LFP					RB						NS gearbox		4”P			Champion PC				New Zealand
FVP		7089		V HB				S						CO SENS					P RB 8/51						3c 2H		4”P			OESL				Fife
FVP		7118																																New Zealand
FVP		7135						S5 DG3+6																			OESL							New Zealand
FVP		7383		V NS				S5						SR LFP					RB 9/51						3C		4”P			OESL Webbed c,case				Melbourne
FVP		7739																																New Zealand
FVP		7751		V TS NHC NHB				S 5						CO LFP					P RB 3/51						3					OESL				New Zealand
FVP		7767		V TS				S –T (NS)						SR LFP					P RB 11/51						3					OESL				New Zealand
FVP		7837												None																				Australia
FVP		7862		V NTS				S 5 NS Grip						SR LFP SENS					In RB						3C		Later			OESL Webbed crankcase				e bay June 2017
FVP		7893		V NHC HB				S 5						SR LFP					P RB						3C		4”P			OESL Later head				Australia
FVP		7896						S 5						SR					RB						3C		4”			OESL				On e bay 4/19
FVP		8035		V 7/16 NHC NHB				S 5						SR LFP					P RB 10/49						3C 2H		4”P Plastic CR			OESL 2pc Champion PC Webbed crankcase				Scotland
FVP8041 was the last to be produced in 1951. FVP8042 was the first to be produced in 1952.
FVP			8090	V				NS							Later				Later PB						Later 4”?		Later			OESL				Holland
FVP			8190	V				S Long											P						4C					OESL				Bury St Edmunds
FV			8222	V7/16 TS NHC HB				S 5							SR LFP SENS				In RB						3C		4”P			OESL Webbed crankcase				Notts
FV			8250	V7/16 NHC NHB				S 5 DG3+6							SR LFP SENS				P RB 12/51						3C 2H		4” P			OESL Webbed crankcase				Fife
FV			8297																															e bay Sept2013
FVP			8369	V				S 5							SR UFP				HRB						3C 2H					OESL				Fife
FVP			8582	V NHC NHB				S 5							SR				None						3C		None			OD OESL Webbed crankcase				Flintshire
FVP			88??																															Walton on the Naze
FV			8905	V				S long							SR UFP				RB						3C		Later			OESL				Skye
FVP			8925	V 7/16TS NHC*NHB				S 5 DG3+6							CO* UFP SENS				P RB 3/52						3C 2H		4”P			OESL Webbed crankcase				Gloucestershire
FV			8964	V NTS NHC HB				S							SR UFP SENS				P RB 2/52						3C		4”P			Webbed crankcase OESL				Lincs
The Engine Support Lug, according to the BS parts list, was changed at S/No.10000. The original ones are described in the parts list as ‘Engine Support Lug fitted to bottom half of crankcase’ and were fitted up to 10000. The later ones were described as ‘Engine Support Lug fitted to top end of Transmission Casing Tube’ and were fitted from engine number 10000 upwards. I am therefore now only recording the type of Engine Support Lug for those engines with serial numbers in the range 7000 to 13000 and using the acronyms OESL (Original Engine Support Lug) and NESL (New Engine Support Lug). We can speculate that the Original Engine Support Lug (OESL) was possibly last fitted in the 9000s, and the new Engine Support Lug (NESL) was probably first fitted at 10000. This probably means that not all the numbers in the 9000s were allocated, and indeed, to date, the recording of known engines before 10000 seems to come to a halt at 8964.
FVP			10021			V 7/16TS NHC HB			S 5						SR UFP							P RB		3C			P 4”			NESL UFP			Greece
FVP			10048						S 5						CO									4C						NESL			Flintshire
FVP			10056			V HB			T NS						CO PFP(B)							RB		3C			5.4”SBPort			NESL			On e bay 7/19
FVP			10090																														Notts
FVP			10152			V									CO							Wipac											Suffolk
FVP			10327			V			S 5 NS Grip						CO UFP SENS							P RB		3C			NESL						On e bay 3/16
FVP			10341																														On e bay 7/18
FV			10349			V			S						SR									3C						NESL			e bay July 2014
FVP			10359
FVP			10422						T 10*													P HRB 5/52		3C 2H						NESL			Gloucestershire
FVP			10469			V			S						SR UFP							RB		3C									On e bay 9/17
FVP			10495			V 1/2			S 5						CO NSPFP(B)							P RB		4			Later			NESL			Cheshire
FVP			10528						S then T						SR															1952 owner was Mr F Peters. Modified to T by BS in 1955			St Mawes
FVP			10562			V			S 5						CO							P RB		4C			Later			NESL			On e bay Mar 2015
FVP			10693			V7/16 TS NHC HB			S						SR*UFP							P RB 5/52								NESL			Fife
At approx this point, the Long(er) Stroke LS was introduced; producing a capacity of 64cc whilst retaining the same 45mm bore as the FV/FVP. It had a different, bigger crankcase to the FV/FVP and was the first engine of this capacity. It utilised the big 10:35 ratio gearbox with prop, and long tubes from the FVP which it appears to have replaced. S/No 11408 is the earliest LS of which I have a record. It is perhaps possible that the LS was introduced at around S/No 11000; or it might have even been at 10000. I suspect that the New Engine Support Lug (NESL) which locates around the drive shaft tube, was present from the start on this model. The parts list also infers that the Stub Tiller was not fitted after 11000. The evidence collected here would support that inference. The evidence would also suggest that the tilting tiller was possibly never an option on new FV/ FVPs. With the introduction of the LS, all tillers appear to be tilting. Earlier FV/FVPs appear to be sometimes fitted at overhaul/repair with a tilting tiller. This must have been especially so, when stocks of crankcases with tiller stubs were no longer available after 11000. The use of the ‘T’ suffix appears to be inconsistent; probably due to which company carried out the repair. Other changes which might have occurred at about this point were:- 1. The change to the magneto from a Rimless Baseplate (RB) to a Half Rimless Baseplate (HRB) ie a rim was added around half of the baseplate. 2. The introduction of the drain Hole in the top of the Bowl (HB) of the carburettor. 3. The introduction of a small air Hole in the Choke shutter (HC). 4. The metal ‘U’ Fuel Pipe (UFP), superseding the Lopped Fuel Pipe (LFP).
FVP		11267		V 7/16 TS NHC HB				T NS									CO PFP				For RB 4/52			4C 2H		5.4”SBPort			NESL Webbed crankcase. 4 extra water inlet holes.					Australia
FVP		11296																											Crankcases driveshaft tube					Australia
FV11364 was the last to be produced in 1952. FV11365 was the first to be produced in 1953.
LS	11408			V				T 12							¾” UFP SENS							P RB		4C			4”P			NESL				ebay Aug 2017
LS	11413			V				T																4			U			NESL				e bayApril2014
LS	11510			V HB				T							3/4"							P												SOS Site
FV	11716			V 7/16TS HC HB				T 10							CO* UFP*							P RB		3C			4”P			NESL				Bristol
LS	11751			V7/16TS HC HB				T 10							3/4"							HRB		4C 2H			4”P			Dismantled and bits sold				e bayJan2015 Kent
LS	11755			V NHC				T 10							3/4" NS FP							P HRB		4C 3H			None			CBPH NESL				On e bay Feb 2015
LS	11897																													NESL Later CBPH				On e bay 3/18
LS	11947			V HB				T							3/4” UFP							In RB		4C			5.4”SBPort			NESL				On e bay 3/19
FV	11973							T																						NESL c’case assy only				Gloucestershire
FV	12044			V				NS T							SR UFP									3C						NESL				E bay July 2017
FV	12112			V NTS				T 10 DG3+6							SR UFP SEWS							In HRB		4C						NESL				Stevenage
FV	12206			V7/16 HB NHC				T 10 DG3+6							SR UFP							In HRB 12/52		4C 2H			5.4”SBPort			NESL Champion PC				Guildford
FV	12460			V				T							3/4"UFP							In		4C			UL			NESL				e bay Aug2014
FV	12508			None				T?							None															NESL. Dismantled/scrapped				Fife
FV	12644			V TS											-							P HRB 4/53		-			-			NESL P’head only				Gloucestershire
LS	12667			V 1/2				T 12														P HRB 1/53		4C						NESL				Canada
FV	12828							T Long							SR									3			U			NESL				On the web
LS	12991							T G 6S																4C 2H			5.4”SBPort			NESL				New York
LS	13081			-				T							-							-		-			-			Crankcase assy				Gloucestershire
FV	13521			V ½ TS HB HC				T 10 DG 3+6							SR UFP							In HRB 5/53		3C			4”P							Flintshire
LS	13824			V 1/2TS				T 10 Dover Grip							3/4"UFP							HRB		4C										Dorset
LS	13906			V HB HC				T12 DG3+6														HRB		4C 2H			NS 5.4”			NESL CBPH				On ebay 8/17
LS	14248			V				T 10							3/4” PFP©									NS			5.4”SBPort							On ebay 3/18
FV	14847			V				T							CO							In		3C										e bayAug2014
LS	14905																																	Ebay May 16
FV	14942			-				T							-							-		-			-			Crankcase only				Fife
LS	15005			V HB NHC				T							UFP							In HRB		4C										Hertfordshire
FV	15020			V				T DG3+6							CO UFP									3C						NESL TPH				Skye
LS	15046							T																						Powerhead assy only				e bay Nov2014
FV	15425																																	Scotland
LS	15703			V				T							3/4"							In		4C			Fixed							SOS site
LS	15869L
LS	16445			V 7/16 NHC				T 10 DG3+6							3/4” NSPFP							In HRB		4C 2H			5.4”SBPort			NESL TPH				e bay Mar 2015 Australia
LS	16727			V NHC				T NS							7/16 PFP(B)							For		4C			Later			NESL TPH				e bay Feb2016
LS	17028																													NESL				New Zealand
LS17828 was the last to be produced in 1953. LS17829 was the first to be produced in 1954.
LS	18407			V7/16NTS HC* HB*				T 10							3/4"NS? UFP							In HRB 1/54		4C 3H*			5.4” SBPort							Tasmania
FV	18785			V				T NS							CO UFP							In HRB		3C			5.4” SBPort			TPH NESL				Bermuda
LS	18849			V 7/16NTS HC HB				T 10							Long range UFP							In HRB		4C 2H*			5.4”SBPort			NESL TPH				Bristol
FV	18928			V				T							SR							Not P		3C										e bay June2014
LS	19267			V HB				T							Long range PFP(B)							In HRB		4C			5.4”SBPort Cotton reel			Straight Villiers Lever				e bay Mar 2015
FV	19304														None																			Holland
It was possibly around this point that the metal ‘U’ Fuel Pipe (UFP) was replaced by the Plastic Fuel Pipe (PFP).
FV	19309			V 7/16NTS NHC HB				T 10							CO LFP*							In HRB to RB*		3C			5.4”SBPort							Greece
LS	19441			V				T 10							7/16” PFP							In		4C			5.4”SBPort			TPH				Hampshire
FV	19742			V				T							CO									4			?							e bayApril2014
LS	20101			V HB HC				T 10 DG 3-6							PFP(B)							In HRB		Later 3H			Later			TPH				Brockenhurst
LS	20187							T							7/16” SEWS							In HRB		4C			5.4”SBPort			TPH				Nova Scotia
LS	20440			V				T							7/16”							In HRB		4C						TPH				Lytham St Annes
LS	20623			V NHC				T 10							7/16” PFP(B)							HRB		4C						TPH				Orkney
LS	20964L			V 1/2				T 10							3/4"									4C						TPH OD-Sailorman				Dorset
LS	21487			V				T																4C			?							On e bay 4/14
LS	21885			V				T							¾”							HRB		Later			5.4”SBPort			TPH				Fife
LS	22022			V																														Taunton
LS	22367			V				T10 NS G							3/4” NSPFP							In or F HRB		4C			5.4”SBPort Cotton reel			TPH				e bay Oct 2015
LS	22689																													In bits				e bayAug2014
It is possible that approximately around this point the LS 3/4" radius tank (of dims L=10.45 W=4.47 H=3.09) was replaced by the 7/16” radius one (of dims L=10.00 W=5.00 H=3.39). These dims recorded here are based on measuring just a few dented tanks, so should be used with great caution. It is worth noting that the FV/FVP canted oval tank has the same overall dimensions as the 3/4" radius tank. It is probably that the FV/FVP canted oval tank was developed after the introduction of this first horizontal LS tank. Indeed the roots of this first LS tank can be traced back further, as the first tank in this range – the small round tank - had the same length of 10.45 and diameter/height of 3.09.
LS	22721			V				T								Later PFP								4 Later			Fixed			TPH				e bay Oct2014
LS	22723																													Powerhead only				Orkney
LS	22741							T																						Powerhead only				e bay Nov2014
LS	22768			V7/16 NTS HC HB				T 10 DG3+6								7/16”						In HRB		4C 2H			5.4”SBPort			TPH Very little use				Greece
LS	23321			V HC HB				T10 Not DG								7/16”? PFP(B)						In HRB		4C Slots			Later			TPH				e bay Mar2015
LS	23745							T 10																4C										Flintshire
LS	23846			V				T 10 DG3+6								NSPFP						HRB		4C			Later			CBPH Seized				Illminster
LS	24100			V7/16NTS HC HB				T 10 DG3+6								7/16"PFP(B) SENS						In HRB 7/54		4C 3H			5.4”SBPort			TPH				South Africa

It would appear that around this point, the Clamp Bolt Pump Housing (CBPH) superseded the Threaded Pump Housing (TPH). I am therefore now only recording the type of Pump Housing for serial numbers in the range 20000 to 30000.
LS	24747			V7/16 NTS HC HB				T 10 DG3+6							7/16”PFP(B)					In HRB 8/54					4C 3H					CBPH				Tasmania
LS	25120																													Crankcase assy only				New York
LS	25322			V				T							7/16”PFP(B) SE?S										4C		5.4”SBPort			CBPH				New South Wales
LS	25408			V HC HB				T 10 DG3+6							7/16” PFP(B)					In HRB 8/54					- 3H		5.4”SBPort			CBPH				Durham
LS	26004			V				T DG3+6							7/16” SE?S NSFP					HRB					4C		5.4”SBPort			CBPH				New South Wales
LS	26125			V7/16NTS HC HB				T 10 DG3+6							7/16” NSPFP					In HRB 10/54					4C 3H		5.4”SBPort			CBPH				W. Australia
LS	26344			V HC				T 10 NS Grip							7/16” FP(B) SENS					HRB					4C 3H		5.4”SBPort			CBPH				On e bay 3/19
LS	26565			V HC				T 10 DG3+6							7/16” SE?S PFP(B)					IN HRB					4C		5.4”SBPort			CBPH. Top clamp bolt & NESL screws wire locked				N W Australia
LS	26707			V				T NS							PFP(C) TE?S					HRB					4C		5.4”SBPort CR			CBPH				ebay Jan2017
LS	26743																																	NSW
LS	26748			V				T 10 DG3+6							7/16” PFP(B)					In HRB					4C 3H		5.4\|”SBPort			CBPH				NSW
LS27084 was the last to be produced in 1954. LS27085 was the first to be produced in 1955.
LS	27327L			V Later				T 10								7/16”						HRB		4C 3H			5.4”SBPort			CBPH				NSW
LS	27489L			V7/16NTS HC HB				T 10														HRB		4C			?			CBPH OD-Seagull				Holland
LS	28457			V												Later PFP(B)								4C			Later			CBPH				e bay Sept2014
LS	28708			V HC				T 10 DG3+6								Later tank PFP(C)						In HRB		4C 3H			5.4”SBPort			CBPH				NSW
LS	29086			V				T								Later PFP						In		4C			Later			CBPH				e bay Aug2014
LM	29462			V HC				T DG3+6								7/16”PFP(B) SE?S						In HRB		4C			5.4”SBPort			CBPH				On e bay 4/19
LS	29789			V NTS HC HB				T 10 DG3+6								PFP(C)						In HRB								CBPH Dismantled and parts sold				e bayMarch2016
LM	29941			V7/16NTS HC HB				T 10* DG3+6								7/16”* TEWS* PFP(B)						In HRB 3/55		4C(6”)			5.4”SBPort			CBPH				Gloucestershire
The LM is identical to the LS except it has the small 10:21 ratio gearbox and smaller prop and the shorter drive shaft and exhaust tubes as per the FV. These two production numbered LMs proves conclusively, if that was ever required, that the LM was a genuine production model.
LS	30008L																															Maldon
LS	30121			V ½ NHC NHB				T							UFP ?EWS							In* HRB		4C			Later					New York
LS	30524			V				Later T							7/16”PFP©							In HRB					5.4”SBPort			Slotted gearbox CBPH		Orkney
LS	30581			V HC				T NS							7/16”PFP(B) TEWS							In/For		NS			Later			Slotted gearbox		Whitchurch
LS	30749																													Cramkcase only		Flintshire
LS	31003			V7/16NTS HC HB				T 10							7/16” PFP							In		4C			UL			OD		Australia
LS	31101			V HB				T 10							7/16” PFP(B)							In		4C 3H			5.4”SBPort					e bayMarch2015 Australia
LS	31369			V HB				T 10 DG3+6							‘Long range’									4C 3H			5.4”SBPort CR					ebay Feb 2017
LS	32661			V 7/16” HB HC				T 12														Wipac		4C								Flintshire
LS	32668			V				T 12							7/16”PFP(C) BE?S							For		4C			5.4”SBPort					e bay May2015
LS	32827			V				T10							7/16”PFP(B)							In		4C			5.4”SBPort					On e bay 7/19
LS	33186			-				-							-							7/55		-			-			Powerhead only		Gloucestershire
LS	33346			V 7/16 HB HC				T 10							7/16” PFP(B)							In HRB 8/55		4C			5.4”SBPort					Flintshire
LS	33642			V HB				T10 DG3+6							7/16”							In HRB		4C 3H			5.4”SBPort					South Australia
LS	33945L			V																		In HRB										Sweden
LS	34482			V				T NS Grip							7/16” SE?S PFP(C)									4C			NS					South Australia
LS	34640							T														In HRB		4 Later			Later					Australia
LS35003 was the last to be produced in 1955. LS35004 was the first to be produced in 1956.
LS	35006			V HC HB				T 12 6SGrip							7/16”PFP(C) SE?S							In HRB		4C 3H			5.4”SBPort					Melbourne
LS	35222			V HC				T 10							7/16”PFP(C)							In HRB		4C			None					e bay Mar 2015
LS	35744			V7/16NTS HC HB				T 10							7/16” PFP							In HRB		4C 3H			?5.4”SBPort Plated*					Bristol
LS	35887			V				T 10							7/16” SEWS PFP(C)							In HRB		4C			5.4”SBPort					e bay May 2017 Burgess Hill
LS	36402?																													Possibly 36442		Kent
LS	36442?																													Crankcase only		Kent
LS	36688			V7/16NTS HC HB				T 10 No Grip							7/16” PFP(C)							For HRB		4C 3H			5.4”SBPort Ali thrust now CR					Bristol
LS	37004							T																4C 3H						1 small hole in exhaust Incomplete/in bits		ebayAug2017
LS	37229			V				T 10? DG3+6							7/16”SEWS PFP(C)							For HRB		4C			5.4”SBPort			Sailorman		EBay March 2016
LS	37648 Poss 36748																													Rebuilt by Classic Seagulls using crankcase from LS14248 inFeb2016
LS	37845L			V				T 10							7/16”PFP(C)							For HRB		4C			Later					LythamStAnnes
LS	37902																															Fife
LS	38004			V											7/16”									4C								London
LS	38087			V				T 12							Later PFP							Wipac		Later 3H			Later					Fife
LS38324 was the last to be produced in 1956. LS38325 was the first to be produced in 1957.
LM	383R				V 1/2TS RH Choke			T 10							3/4”										4C					CBPH NESL OD-Sailorman				Dorset
FVP	None																													Serial number is not stamped				Australia
FV	1XXXX							T							SR															Number ground off. Powerhead and tank only				Gloucestershire
SPS	64082				V HC			T							PFP(C)							HRB			3C (FVP) 3H		5.42SBPort			CBPH
LS	38344				From documents rescued from BS by John Williams, this would appear to have been the last engine of this series
After the LSs came the SJMs and the SJPs. Well not quite, as there was an overlap when the all three were being produced simultaneously. Probably also some LMs were produced as well during this period. It is interesting how the Early Series Forty models were developed during their production. The introduction of the ‘big’ gearbox for the FVP was a success, as was the introduction of the LS, which I have suggested stood for Long(er) Stroke. This longer stroke unit, compared to the FV/FVP, increased the capacity by about 9cc to 64cc. The crankcase corrosion issue was addressed by the introduction of the SJM/SJP, which I have suggested stood for Sealed Jacket Minus/Plus. In this unit the cooling water was in a Sealed Jacket cylinder block design and thus water could not be in contact with the crankcase to cause corrosion. In the last 2 years or so of the production of the Early Series Forty Models, the SJM/SJPs were being produced alongside them in steadily increasing numbers as the following table shows. This overlap allowed efficient commonality of parts between the two designs and time to resolve any potential design or production problems. The following production figures assume all the serial numbers were allocated.
Year							SJM/SJP Serial #s						SJM/SJP Quantity										LS/LM Serial #s					LS/LM Quantity			Total Annual Quantity
1955							10 to 586						577										27085 to 35003					7,919			8,496
1956							587 to 3903						3,317										35004 to 38324					3,321			6,638
1957							3904 to 9772						5,869										38325 to 38344					20			5,889

Jeremy L Prince (Contactable on the SOS Owners Forum, username Gannet) Updated February 2021

Little Forty.

These notes are to assist in understanding the information in the Data Sheet. The columns in the table are headed:-

1. Model
This consists of F, FV, FVP, LM or LS.

2. Serial Number
The unique serial number of each engine.

5. Tank
The photo shows 4 types of tanks. From left to right they are:-
a) Small Round - SR as fitted to F, FV and FVP.
b) Canted Oval - CO for F, FV and FVP.
c) The early LS oval tank wth the large edge rads of approx. 3/4".
d) The later LS oval with the smaller edge rads of approx. 7/16".

Flywheel
The date of the Flywheel is shown as the last few digits at the end of an ident number, stamped as shown in the bottom of this photo, as a month and year. In this example it is 7 -50 ie July 1950. Recorded as 7/50.

7. Propellor.
The number of blades and their shape are recoded. A three blade Cloverleaf is recorded as 3C.
For the FVP and the LS the number of water inlet holes, which is either 2 or 3 are recoded.

9. Miscellaneous.
This column is used for a variety of different information.

A. The Engine Support Lug.
The Original Engine Support Lug (on the left in the photo) is recorded as OESL. The New Engine Support Lug (on the right in the photo) is recorded as NESL

Little Forty.

These notes are to assist in understanding the information in the Data Sheet. The columns in the table are headed:-

1. ModelThis consists of F, FV, FVP, LM or LS.

2. Serial NumberThe unique serial number of each engine.

5. TankThe photo shows 4 types of tanks. From left to right they are:-a) Small Round - SR as fitted to F, FV and FVP.b) Canted Oval - CO for F, FV and FVP.c) The early LS oval tank wth the large edge rads of approx. 3/4".d) The later LS oval with the smaller edge rads of approx. 7/16".

FlywheelThe date of the Flywheel is shown as the last few digits at the end of an ident number, stamped as shown in the bottom of this photo, as a month and year. In this example it is 7 -50 ie July 1950. Recorded as 7/50.

7. Propellor.The number of blades and their shape are recoded. A three blade Cloverleaf is recorded as 3C.For the FVP and the LS the number of water inlet holes, which is either 2 or 3 are recoded.

9. Miscellaneous.This column is used for a variety of different information.A. The Engine Support Lug.The Original Engine Support Lug (on the left in the photo) is recorded as OESL. The New Engine Support Lug (on the right in the photo) is recorded as NESL

1. Model
This consists of F, FV, FVP, LM or LS.

2. Serial Number
The unique serial number of each engine.

5. Tank
The photo shows 4 types of tanks. From left to right they are:-
a) Small Round - SR as fitted to F, FV and FVP.
b) Canted Oval - CO for F, FV and FVP.
c) The early LS oval tank wth the large edge rads of approx. 3/4".
d) The later LS oval with the smaller edge rads of approx. 7/16".

Flywheel
The date of the Flywheel is shown as the last few digits at the end of an ident number, stamped as shown in the bottom of this photo, as a month and year. In this example it is 7 -50 ie July 1950. Recorded as 7/50.

7. Propellor.
The number of blades and their shape are recoded. A three blade Cloverleaf is recorded as 3C.
For the FVP and the LS the number of water inlet holes, which is either 2 or 3 are recoded.

9. Miscellaneous.
This column is used for a variety of different information.

A. The Engine Support Lug.
The Original Engine Support Lug (on the left in the photo) is recorded as OESL. The New Engine Support Lug (on the right in the photo) is recorded as NESL