Motorcycle Discussions > Japanese Bikes
1962 YD3 250 not firing PTO side
willis78:
Hello, I have a 1962 YD3 250 that will only fire on PTO side every once in a while. Compression good, carb clean, point set, timing checked, has good spark with it running on mag side. Seal behind clutch looks good. I'm stumped. Inner crank seal? Any ideas!?
Thanks!
Aaron
Rex:
Don't see why a failing crankseal would allow it to fire "once in a while", so I'd go for electrical swap-overs...plug, capacitor, coil etc before thinking about engine strips.
Neoprene seals rarely seem to fail much these days, in my experience.
willis78:
Thank for the reply Rex. It is odd that it will only fire once in a while. I have it running on mag side and I have put a new plug in PTO cap while its running and spark is great. I hear every once in a while from some folk that spark can fail "under compression" Maybe that is whats happening here. Can I just swap the plug wires from side to side? Do the coils fire the same? They are a pain to get at. Stamped frame and they are inside. I have run new wires from the mag to each coil so I know they are not the issue.
iansoady:
I don't know the bike but if a 2 stroke twin would expect 180 degree crank therefore firing position will be different side to side so no can't just swap plug leads. You could swap all connections to the coils and then swap plug leads however.
willis78:
Thanks Ian,
I didn't think about that...I ran new wires to coils from the mag and left lots of slack for routing so i will swap them out there. I will keep posted.
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