Hi all. My little brain is getting a headache sorting out model names. What I've got is a 1971 Featherweight reg shaft and a 76 Forty plus long shaft. External both look the same except the 40+ longshaft is obviously taller. I've got an original page from a factory brochure that gives some basic specs for a few models: Forty Plus, Forty Minus, Century and Century Plus. Is the Featherweight a variation of the 40- or a different model category all together? Similar question on the Century models. Might have a chance to pick up a Century(I think plus version) but notice there are also Century Silver models out there. I've got the specs of the Century and Century Plus but wondering where the Silver fits in.
Thanks,
What's in a name?
Moderators: John@sos, charlesp, Charles uk, RickUK, Petergalileo
Re: What's in a name?
Leaving out the first attempts at a smaller range of motors, the 64cc Forty Plus and Forty Minus in 1955 started a long production run that lasted until 1996 with a few variations.
The SJM became the F (ie the Forty Minus became the Featherweight) in the late sixties when the magneto was changed from Villiers to Wipac. Essentially it was the same motor all the way through. It was only ever available in one shaft length, shorter than 'standard'
The Forty Plus was known as such all the way, and was available in 'standard' or 'long' shaft versions. The power heads of these motors was the same, in other words intechangeable. It was the smaller prop and geabox of the Featherweight/Forty Minus that made it less powerful
The difference between a Century and a Silver Century is that the latter had a slightly larger diameter spigot on the block to accept an Amal carburettor, which gave a useful boost in power.
Hope that helps
The SJM became the F (ie the Forty Minus became the Featherweight) in the late sixties when the magneto was changed from Villiers to Wipac. Essentially it was the same motor all the way through. It was only ever available in one shaft length, shorter than 'standard'
The Forty Plus was known as such all the way, and was available in 'standard' or 'long' shaft versions. The power heads of these motors was the same, in other words intechangeable. It was the smaller prop and geabox of the Featherweight/Forty Minus that made it less powerful
The difference between a Century and a Silver Century is that the latter had a slightly larger diameter spigot on the block to accept an Amal carburettor, which gave a useful boost in power.
Hope that helps
Re: What's in a name?
Thanks Charlesp, helps a lot.