On a '74 TY240 there are 3 coils inside the mag. Only one (I guess) feeds the spark, other two for lights. Is there any reason to leave the lighting coils inside a "non-lights" Trials only bike?

Second question: what is 434-81332-10-00 PLATE, TIMING since there is no adjustment to the timing what does this plate do?

Thanks

Alan

Taking out the lighting coil will not affect the ignition system.

If you are talking about the stator backing plate, then it just a slight issue with the english translation from Japanese. What do you reckon it should be called?

That plate allows different ignition systems to be fitted to a generic inner case casting ie a trailbike or MX bike that shares the same LH motor casting with the TY250A may have a points ignition with mechanical advance, or it might have an internal rotor elctronic ignition.

That plate also allows the ignition to be removed and replaced to inspect or replace the crank seal, without having to reset the points when reassembling.