AT gearbox sprocket/shaft size
 

Any of you AT buffs out there know what other model's gearbox sprocket will fit the AT output shaft? The reason for my question is as follows....A friend of mine has fitted an AT motor into an EML enduro outfit chassis fo make a pretty much go-anywhere,do-anything sidecar outfit (which works extremely well!).The EML uses Talon hubs and the standard rear sprocket runs with a 50(520) pitch chain.The AT runs a 525 pitch chain which is being used at the moment on the 50 pitch rear sprocket(same tooth pitch just narrower).What he wants to do is find a 50(520) front sprocket that fits the AT splines of the output shaft.Any ideas fellas?

What year motor is it? I will look thought the micros (i dont know if it varies year to year but the codes did change).

Honda Dominator's run a 520 chain and the front sprocket spines are the same as the Africa twin and Transalp.

Steve