blaster swingarm/chain problem

[djack12]

i have a +4 extended swing arm in my blaster with a yfz450 rear shock. the problem i am having is the chain keeps falling off. it seems like if i adjust it with 1-1.5 inches of slack when i sit on the quad it gets really tight. when i looses the chain alot so when i sit on it it still has slack if falls off when i go over large bumbs/jumps. any help on what to do would help. thanks

 

[pittboss45]

IF you have a lower chain guide the upper rollers are in good shape, and the chain is aligned properly then the chain will stay on. I'll bet there is something out of alignment.