chassis flex?

kartboy63

Member
I have a 2015 kart that we have been running SA motors on, I went to a big block 390 and cant keep a chain on now, any ideas on what it could be? Could it be axle flex, chassis flex, I use lock collars on the frame to keep the motor mount from moving so its not that. I ran without a jackshaft and slung the chain several times and now with the Burris style jackshaft it comes off the jackshaft gear to the rear sprocket.
 
Probably a combination of things. Make sure you have a quality motor mount, as I've seen that be the problem. Have you tried a new gear hub? A floating one certainly wouldnt hurt.
 
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