OK
moment
The James "Captain" was fitted with either a 197 cc villiers engine with seperate "bolt on" gearbox
Or the AMC 197 cc engine (unit construction)
The James Cadet was a 150 cc engine also available in both types
Both were two stroke singles
The AMC engines were a "later" fitment (around 58/9) when the factory* decided that they "needed" their own engine ?
(possibly as Villiers were winding down their production of the "E" series engines)
My 1957 150 Cadet had the Villiers engine with the enormous brass flywheel magneto/generator
It was my 1st real road going solo
My elder brother bought it to run about on while he rebuilt his Gold Flash
Then "sold" it on to me for the same price as he paid for it (£8)
[ that was two weeks wages ! ]
I rode as it was, all stripped down and tuned up with "ace" bars and rearsets, for a couple of months
But the timing kept slipping as the BIG flywheel would move on the crankshaft being on just a taper
NO wudruff key, yes that's the way they were made by the factory,
The points cam was in the centre of the inside of the flywheel, and a "loose" sleeve nut was what held it all onto the crank
It was a real pain without the correct "hammertite"
spanner ( special factory tool *)
Arkid got fed up of coming out to fix it when that happened
So he made me take the bike apart, every last nut and bolt
I was gutted
But it was the biggest favour he ever did me
I rebuilt that little bike and learned so much about basic bike mechanics
Bit I'm still "learning"
*AMC owned AJS, Matchless, James, Francis Barnet and the Ambassador marques
Possibly a few more that I've forgotten the names of too ?
*which was a large "full hexagon" single ended ring spanner with a block of metal on the end to "hit with a hammer" !