SEM strikes again!!!

Have you measured the resistance in the linings?

JJW501 said:

To exclude CDI or aother wiring problem, put wires form my stator onto his bike and we got spark. next we put his stator in my bike and only got intermittent spark.

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If your stator worked in his bike, and his stator would not work in your bike, then his new stator is defective.

Only problem I've heard of with the SEM flywheels is one had the magnets come loose & another got busted trying to pull it off.

I once had an outboard (~'75 model) where I left the flywheel off for a couple of months without the stator inside it. After reassembly it had no spark at normal crank speed, pull the plugs out & let it spin faster & it had spark. Got the ***** with it & left it (assembled) a fortnight. Tried it again - it worked OK & then never missed a beat??? Seems the magnets must have lost some of their magnetism without the stator in place to act as an iron core "keeper". I've since seen mentioned in old books that say not the leave magnets open for long without a keeper core in place.

Don't know if this could be a problem with the later magnets. If it is it might help explain why 'berg only sells stators & flywheels as pairs. I have no idea if KTM sell a flywheel without a keeper core inside?