Hi Peter;Tim,
The clue will be in the gearbox internals. It might be you just have a BAPCA outer cover; but if the gears have 5 dogs on them they are close ratio gears (with high bottom gear - or even low ratio trials gears). Let me know the numbers of teeth and I can identify them for you. I might even buy them from you if you're in selling mode.....
Peter B
Bristol, UK
I know the TTR's came with close ratio dog style gears, however I can tell you that there are standard ratio dog style gears out there. I have a set in my TTR. I think they came from and AJW. Dan bought the whole box from somewhere in the South of the UK and put it in the AJS V4 but the gears howled like a banshee so a set of standard type gears went in. When I was building the TTR we were talking about dog gears and he allowed as that he had a set on the shelf, but were very noisy. About a week later he called and said I owed him $50 bucks. When questioned for what, he just quietly said "the steel for the new double gear and out put gear for the dog gear set. It was those that were the noise problem. Oh and for the steel for the broach for the double gear internal spline"
They have the same No of teeth as the standard type gears.
Plus for those that don't know, many of the pre and post war internals (gears in particular) are the same. I raided a late Ariel Sq 4 box for better internals on the A twin, but kept the original bits with all the right numbers on them.
Cheers Robert