1985 125 atc chain issues

[elitespecialkid]

I've been working on a friends 85 atc, and finally after spending weeks fixing carb issues, the chain decided to start slipping off of the rear sprocket. I thought oh, easy fix and put it back one, but it was really loose, and after 15ish minutes of riding and one good bounce, the chain popped back off. Is there a way to tighten the chain or is it time to replace? The rear sprocket is worn to a degree, but still seems usable to me, but i could be wrong

[C Kerley]

Yes, it has some adjustment. Look here for a downloadable manual, and it'll explain it...pretty easy project.

[mrmello]

Yes there is an adjuster. You have to loosen the rear bearing carrier bolts on both sides. This means opening the brake drum if the bolts turn. Then usually on the lower left side when behind the bike there is a tensioner on it similar to a bicycle only bigger. Tighten the nut until you get the desired tension and tighten the bolts up.

Hope this helps!

[elitespecialkid]

Thats helpful, thanks guys. i'll try and find a manual just to make it that much easier. Thanks again, i'll try and post the progress i make

[MonroeMike]

Look here.
http://www.3wheelerworld.com/showthread.php?126529-ATC90-110-125m-(84-85)-amp-TRX125-(85-86)-Service-Data

[elitespecialkid]

Thanks for your help guys, went riding around all weekend and it ran like a champ! Except for the fact that i was up against a 350 rancher and 400 eiger lol. It ran great though no chain issues thanks again guys

[mrmello]

Good to hear ya got it tightened up!!

[elitespecialkid]

I'm sure come this summer i'll practically be living on this website lol. i'll most likely be rebuilding several atc 70's for a guy along with my own atc 110