when suspension is compressed chain tightens

[bryceheinz]

its a 87 quadsport and its doing just as the title says. The chain is real loose when standing or no ones on the quad and its chewing up the swing arm, when i sit on the quad the chain tightens up to exactly where it should be. also the chain pops off every time i give it some hard throttle. any help is appreciated.

[rooster300ex]

Tighten it alil more. Your chain may be really really wore out or something. Get a new chain & sprocket kit and start from there if you can't get it to quit coming off.

[bryceheinz]

Heres a pic of the swingarm and the other two are of the thing that surrounds the front sprocket, whats its purpose?

http://img263.imageshack.us/img263/4714/spa0607bl5.jpg
http://img263.imageshack.us/img263/2664/spa0602gq8.jpg

http://img528.imageshack.us/img528/9830/spa0599ft1.jpg

[rooster300ex]

Your chain guide on the top pic is wore smooth out. You need to get a new chain guide,new sprocket&chain kit and be done with it.

[bradley300]

the chain will always get loose then tight again as you go thru the travel. its because the sprockets arent on the same arc as the swingarm pivot and axle