Main motor barrings

[tri-valleyracin]

after riding it once around my main barrings went. i had put a new topend on it and it had no spark so i took it to a local shop to see if they can fix it. they told me the main barrings are so bad the flywheel hit the stator and shorted it out. they told me it would be $600 to fix. what do i have to do to fix it my self. the barrings and seals are cheaper. i have the motor on the bench and i was thinking of building a hybrid instead but i like the 2 stroke. should it buy a bottom end and put my good topend on it. this is a 1986 quadracer 250r

[sblt500r]

you have to split the cases. plus you'll probably need a new stator. that must have been knocking real bad, you must have heard it.

[tri-valleyracin]

u would think it was knocking but it wasnt it ran vary smooth. and sounded good.

[sblt500r]

are you sure its main bearings then? did you grab the flywheel and see if it moves up and down, left and right?

[tri-valleyracin]

Yup it moves. the stator was brand new so idk. the shop told me it was the barrings and the crank moves up and down were the stator is.

[Kane]

1st of all, shorting out is what the pick-up is DESIGNED to do. It creates a short which in turn signals the CDI to do it's thing. While your pick-up coil MAY have been BEAT to death, touching will not "short" it out. It will, however, "confuse" the pick-up and stop it from sending the signal. Before you go wasting money, test the pick-up to the manuals specs. Likely you just need to get those bearings replaced and get the proper spacing between the stator and pick-up, restoring the correct magnetic field.