BS standardising perhaps? Just out of interest what diameter are the inlet stubs on the later model 40's (SJP,FP etc.)??
AJ
LS 26125
Moderators: John@sos, RickUK, charlesp, Charles uk
-
Adrian Dale
- Posts: 758
- Joined: Wed Apr 16, 2014 7:58 am
- Location: Tasmania, Australia
-
Collector Inspector
- Posts: 4199
- Joined: Sun Jun 29, 2008 4:32 am
- Location: Perth Western Australia
- Contact:
Re: LS 26125
Progress.
In the dark of night I found a baby Amal that is 7/16 and slipped on to the stub without a problem. 359/087B. 60cc British application about the same year.
I also found a few more similar so chose the richest slide. The needle I put at 2nd from the top out of five steps and the main jet is #80.
Put it together in the carport and 1st pull....................ran crisp as an Old Dingo's Thingy. Looking good for Monday public holiday.
Monday and into the tank...................
First pull and idled right down for me to grab my phone camera (Set on anti shake video if you wonder at the vid quality)
Crisp again.......................nearly tempted to put a twist grip throttle on it actually.............sounds like and responds like a two stroke that is not exactly a Seagull sound?
Sounds and responds nicely..............let it run for 1/2hr.............the test was to check that the base gasket/shim was sealing and testing my other thorts as to WTF is this not happening as planned earlier post.
Prop on next time after gearbox swilling........................
Conclusion....................these things need small carbs.
here is a pic of the plug after extended run in a tub (NOT on a transom)
I see no possible damage being done so far. Mix was 12:1 TCW3. Dry fluffy centre and 1/2 of electrode with semi wet/wastage oiling about circumference.............. 
Here is the vid. Listen closely...................the Old Man is relaxed and happy. Mechanically all my doubts are done and dusted
Could someone fix the Smilies please?
B[/color]
In the dark of night I found a baby Amal that is 7/16 and slipped on to the stub without a problem. 359/087B. 60cc British application about the same year.
I also found a few more similar so chose the richest slide. The needle I put at 2nd from the top out of five steps and the main jet is #80.
Put it together in the carport and 1st pull....................ran crisp as an Old Dingo's Thingy. Looking good for Monday public holiday.
Monday and into the tank...................
First pull and idled right down for me to grab my phone camera (Set on anti shake video if you wonder at the vid quality)
Crisp again.......................nearly tempted to put a twist grip throttle on it actually.............sounds like and responds like a two stroke that is not exactly a Seagull sound?
Sounds and responds nicely..............let it run for 1/2hr.............the test was to check that the base gasket/shim was sealing and testing my other thorts as to WTF is this not happening as planned earlier post.
Prop on next time after gearbox swilling........................
Conclusion....................these things need small carbs.
here is a pic of the plug after extended run in a tub (NOT on a transom)
Here is the vid. Listen closely...................the Old Man is relaxed and happy. Mechanically all my doubts are done and dusted
Could someone fix the Smilies please?
B[/color]
A chicken is one egg's way of becoming others
Re: LS 26125
Bruce,
Well done for getting it going so nicely. have a great time with it!
Adrian,
Some LS (or possibly might be FV/FVP) blocks have inlet dia of 1/2". Some, perhaps a lot, have 7/16".
Its not correct as a general statement, to say that LSs have a 7/16" dia inlet.
Although the evidence points that they were all originally fitted with a 7/16" carb.
The 7/16 carb on a 1/2 inlet dia might seem initially not to be technically sensible. However, did the 1/2" inlet allow better/different port timing compared to the 7/16" inlet? Certainly if the different size inlet ports were machined on the same centres, then the inlet port duration would be longer with the 1/2". Probably not significantly so, but I really don't know. I expect Charles could answer that??
My early SJM (SJM35) has an inlet dia of 7/16". So clearly the 'new' Forty Minus didn't (at least not all of them) have a 1/2" dia inlet.
All a bit of a puzzle.
Some blocks have a brass sleeve in the inlet. Some of these are 1/2" dia and some 7/16". Perhaps a different supplier to BS? Perhaps another reason?
Jeremy
Well done for getting it going so nicely. have a great time with it!
Adrian,
Some LS (or possibly might be FV/FVP) blocks have inlet dia of 1/2". Some, perhaps a lot, have 7/16".
Its not correct as a general statement, to say that LSs have a 7/16" dia inlet.
Although the evidence points that they were all originally fitted with a 7/16" carb.
The 7/16 carb on a 1/2 inlet dia might seem initially not to be technically sensible. However, did the 1/2" inlet allow better/different port timing compared to the 7/16" inlet? Certainly if the different size inlet ports were machined on the same centres, then the inlet port duration would be longer with the 1/2". Probably not significantly so, but I really don't know. I expect Charles could answer that??
My early SJM (SJM35) has an inlet dia of 7/16". So clearly the 'new' Forty Minus didn't (at least not all of them) have a 1/2" dia inlet.
All a bit of a puzzle.
Some blocks have a brass sleeve in the inlet. Some of these are 1/2" dia and some 7/16". Perhaps a different supplier to BS? Perhaps another reason?
Jeremy
-
Collector Inspector
- Posts: 4199
- Joined: Sun Jun 29, 2008 4:32 am
- Location: Perth Western Australia
- Contact:
Re: LS 26125
Hmmmm
Would an investigation as to barrel port heights between discussed be something to consider?
Not the end of all port timing stuff......(NO Charles).................just something that could be done with an engineers rule kind of thing with something else to ponder?
Port timing with whatever piston...................Breathing.
I never knew about brass sleeves...........more info at your leisure if you can aye.
B
Would an investigation as to barrel port heights between discussed be something to consider?
Not the end of all port timing stuff......(NO Charles).................just something that could be done with an engineers rule kind of thing with something else to ponder?
Port timing with whatever piston...................Breathing.
I never knew about brass sleeves...........more info at your leisure if you can aye.
B
A chicken is one egg's way of becoming others
-
headdownarseup
- Posts: 2484
- Joined: Thu Apr 04, 2013 2:26 pm
- Location: bristol
Re: LS 26125
Just following on with the carb sizes here, my SJM210 also has a 7/16 carb fitted. Runs like a grandfather clock,really sweet old thing.
Not quite sure when BS made the transition to the 1/2" carb though.
Port timing i'm sure will be something different entirely,and possibly quite difficult to measure with any degree of accuracy.
Both Jeremy and myself know how far out some of these cylinders can be. (not just 40's either-100's,102's to mention a few)
Another topic perhaps?
jon
Not quite sure when BS made the transition to the 1/2" carb though.
Port timing i'm sure will be something different entirely,and possibly quite difficult to measure with any degree of accuracy.
Both Jeremy and myself know how far out some of these cylinders can be. (not just 40's either-100's,102's to mention a few)
Another topic perhaps?
jon
-
Collector Inspector
- Posts: 4199
- Joined: Sun Jun 29, 2008 4:32 am
- Location: Perth Western Australia
- Contact:
Re: LS 26125
Port measurements made using an engineers rule from the base......................no rocket science.
Basics
B
Basics
B
A chicken is one egg's way of becoming others
-
Collector Inspector
- Posts: 4199
- Joined: Sun Jun 29, 2008 4:32 am
- Location: Perth Western Australia
- Contact:
Re: LS 26125
I just had a thort in that my above proving the mechanical integrity (As of right now...............future may be somewhat uncertain with use) LS 26125, using another carb from something else is rather something best left to those having a very firm grip as to how all of this smoke and mirrors work.
I have been around for a while...........previous to S.O.S. by more years than I can remember.........SO
Especially on an Old Dear such as LS 26125, and any other Gull for that matter, please refrain from experimentation for "Something Better" than what they were supplied with.
I am now in search of the correct carb so if anyone has a spare..............let me know aye.
Keep a Gull as it should be.
Not what it could be.
B
I have been around for a while...........previous to S.O.S. by more years than I can remember.........SO
Especially on an Old Dear such as LS 26125, and any other Gull for that matter, please refrain from experimentation for "Something Better" than what they were supplied with.
I am now in search of the correct carb so if anyone has a spare..............let me know aye.
Keep a Gull as it should be.
Not what it could be.
B
A chicken is one egg's way of becoming others
-
Adrian Dale
- Posts: 758
- Joined: Wed Apr 16, 2014 7:58 am
- Location: Tasmania, Australia
Re: LS 26125
I agree B I have 10 running and all are as close as I can get them to original. right down to steel plates . That reminds me.. Ill get your in the post tomorrow!!
AJ
AJ
Re: LS 26125
Yes, I belong to that same group - keep or get the engine to as an original specification as possible.
But, the difficulty comes in trying not to make it look too new, or heaven forbid, more polished and 'shiny' than when it was new.
This is really difficult to achieve when repairing and painting the tank for example. Although a bit of useage on the back of a boat will usually (unfortunately!) soon make it look used again!
Jon and I have discussed this aspect - I am not too sure if we reached any real conclusion. I have got to be really careful with the tank on FV2821 as Jon made a superb job of painting it. The real advantage of these small round tanks is that you can use your old socks over the ends to give the paint some protection against the inevitable knock when moving it around the workshop.
Jeremy
But, the difficulty comes in trying not to make it look too new, or heaven forbid, more polished and 'shiny' than when it was new.
This is really difficult to achieve when repairing and painting the tank for example. Although a bit of useage on the back of a boat will usually (unfortunately!) soon make it look used again!
Jon and I have discussed this aspect - I am not too sure if we reached any real conclusion. I have got to be really careful with the tank on FV2821 as Jon made a superb job of painting it. The real advantage of these small round tanks is that you can use your old socks over the ends to give the paint some protection against the inevitable knock when moving it around the workshop.
Jeremy
-
headdownarseup
- Posts: 2484
- Joined: Thu Apr 04, 2013 2:26 pm
- Location: bristol
Re: LS 26125
you can use your old socks to polish 'em as well 
As mentioned many times before, each to their own when it comes to restoration.
I personally like to see dings and dents,scratches and a bit of missing paint here and there. Keeps it looking honest!
Patination can often be removed, this is what i try to retain (as much as possible) on my motors.
Clean and tidy but presentable and above all functional. Simple---just as a seagull should be.
Nothing wrong with "Bling" either (just not too much)
B
any news with making up crates to put the old dears into for safe keeping?
I have far too many in my small shed and they seem to be leaning against one another now. (not good for tank ends)
jon
As mentioned many times before, each to their own when it comes to restoration.
I personally like to see dings and dents,scratches and a bit of missing paint here and there. Keeps it looking honest!
Patination can often be removed, this is what i try to retain (as much as possible) on my motors.
Clean and tidy but presentable and above all functional. Simple---just as a seagull should be.
Nothing wrong with "Bling" either (just not too much)
B
any news with making up crates to put the old dears into for safe keeping?
I have far too many in my small shed and they seem to be leaning against one another now. (not good for tank ends)
jon
-
Collector Inspector
- Posts: 4199
- Joined: Sun Jun 29, 2008 4:32 am
- Location: Perth Western Australia
- Contact:
Re: LS 26125
headdownarseup wrote: B
any news with making up crates to put the old dears into for safe keeping?
I have far too many in my small shed and they seem to be leaning against one another now. (not good for tank ends)
jon
Crate.....yes.......I still have to measure that...............My Bad...........Soon.
Leaning on each other................See post just recently.
Again my Bad aye.
viewtopic.php?f=2&t=5241
Cheers
B
A chicken is one egg's way of becoming others
-
Collector Inspector
- Posts: 4199
- Joined: Sun Jun 29, 2008 4:32 am
- Location: Perth Western Australia
- Contact:
-
Collector Inspector
- Posts: 4199
- Joined: Sun Jun 29, 2008 4:32 am
- Location: Perth Western Australia
- Contact:
Re: LS 26125
Carb Sorted!
Thank you very much Charles.
B
[/color]
Thank you very much Charles.
[/color]
A chicken is one egg's way of becoming others
-
headdownarseup
- Posts: 2484
- Joined: Thu Apr 04, 2013 2:26 pm
- Location: bristol
Re: LS 26125
That will sort the old dear out B.
The correct carb will work SOOOOO much better than any old replacement that fits and sort of works!
Fuel mix screw might need to be "fiddled with" to get it spot on. (i bet you end up at around 1/2 turn down from flush or somewhere very near to that)
Have you done a basic compression test on it yet?
Most of mine push out between 90-105 psi and run quite sweet at that, although the latest one i'm working on is quite a bit lower at 75psi and is a PIG to start.
The 3 LS's that i have now seem to be about right at 1/2 turn down from flush. Plugs not too sooty (grey/brown) with just a little bit of wasted oil mess around the outside of the electrode. (10:1 fuel mix)
All 3 of mine have a 7/16 carb, the newest being 36688 so one of the last ones, which might confirm that all LS's have (or should have) a 7/16 carb for best results.
Going back to earlier in this thread, copper head gasket? Sounds like it's been apart some time ago.
Steel base gasket sounds right. (all of mine have steel gaskets top and bottom)
Even my little SJM has a steel head gasket!
Curious little things aren't they... all of them slightly different in their own way!
Good luck when it fires up in the bin again. (another vid perhaps?)
Jon
The correct carb will work SOOOOO much better than any old replacement that fits and sort of works!
Fuel mix screw might need to be "fiddled with" to get it spot on. (i bet you end up at around 1/2 turn down from flush or somewhere very near to that)
Have you done a basic compression test on it yet?
Most of mine push out between 90-105 psi and run quite sweet at that, although the latest one i'm working on is quite a bit lower at 75psi and is a PIG to start.
The 3 LS's that i have now seem to be about right at 1/2 turn down from flush. Plugs not too sooty (grey/brown) with just a little bit of wasted oil mess around the outside of the electrode. (10:1 fuel mix)
All 3 of mine have a 7/16 carb, the newest being 36688 so one of the last ones, which might confirm that all LS's have (or should have) a 7/16 carb for best results.
Going back to earlier in this thread, copper head gasket? Sounds like it's been apart some time ago.
Steel base gasket sounds right. (all of mine have steel gaskets top and bottom)
Even my little SJM has a steel head gasket!
Curious little things aren't they... all of them slightly different in their own way!
Good luck when it fires up in the bin again. (another vid perhaps?)
Jon