430 wr running bad

only if you put batteries in the light

My experience with failing SEM stators is that the bike does run very badly at high rpm when the engine is hot. My most recent case the bike ran 100% normal for maybe first 15 minutes.
The bike often will start normally when cold and will not start when the engine is hot.

If the Engine runs badly when it hot the stator or coil could have a broken wire heat makes it open up wider. Cold it runs.

The pic above is the flywheel from the 430. I'm not sure if the piece missing is a problem. That part of the magnet passes a single pickup.

I finally found why this bike ran bad. It was weird, it would seem lean on the bottom and break up from 1/4 throttle to wide open. I went to the husky gathering with it and it ran terrible. Felt lean on the bottom and would break up from 1/4 throttle on up. I went thru the carb the other night. When I went to test ride it, it wouldn't start and flooded. Gas was running on the ground. I looked at where it was coming from and I traced it to the mag cover. I pulled the ignition and the screws holding the plate for the crank seal had come loose. Gas was coming from behind the plate. I put some sealer on the gasket and now the bike runs great! I never had a bike run so bad from something like that.

That crank seal is the easiest to replace. Lucky you!