Hey guys first post here. I have been around dirt bikes forever and street bikes even longer and this is driving me a little batty.
The chain is fine works great until I load the crap out of it. IE riding up a river bank or steep hill. I hear it jump once or twice and BANG off it comes.
I can't seem to get this right, the chain is straight as straight can be? I was wondering if the front sprocket could be sloppy or flexing and causing the issue?
Anyway I could use some suggestion and would really appreciate any help.
Dave

 

Does anybody know if I can use a 520 chain with a 13 tooth cs sprocket and rear for said 520 and if so where can I get the sprokets? my quad is a 250 b

 

i presume you've tightened the chain? does it have these on the rear?
chain tensioner

 

Yes it it quite tight and I only have the problem when it's heavily loaded on the climb or a sudden WOT of the throttle going uphill. I am a prtly bastid I might add 285

 

Oh well I fixed the problem...
I bought a Polaris phoenix, 2 of them actually