chain keeps popping off sprocket

[madaneerg]

always heard a bit of a "click" once in awhile, but yesterday the whole chain seemed to climb off the rear sprocket under speed and popped off.

I can't seem to get it back into alignment now. & not sure what's wrong as I adjust the tensioner (cheap nasty one) that came with the kit and looks dead on. Then I wheel the bike and it climbs up again.

Strangest thing is when I roll it in reverse, no problems.

Any ideas? Sure it's right under my nose

 

[Alaskavan]

It just about "Has to be" alignment. The only other possibility (that I can think of) would be that your chain has stretched on one side (possible half broken link?). I'd put a straight edge on the rear sprocket and see if it lines up with the front one.

 

[madaneerg]

ok, like the straight edge idea - didn't think of that. better than guessing

 

[Al.Fisherman]

String would most likely be easier to thread through frame. Pull on both ends for a straight line.

 

[madaneerg]

thanks Al.Fisherman - and thanks for being so helpful in other threads.

 

[Lazieboy]

chain

Is your tensioner pushing up on bottom of chain. maby this is a stupid responce but i screwed this up at first build.

 

[Lazieboy]

Al, I also did that but only on the motor's sprocket.

 

[Al.Fisherman]

Al, I also did that but only on the motor's sprocket.

I do both on all builds weather they look like they need it or not. Had a issue on my first build and the rear sprocket was more of a PITA on then off.

 

[gearhead222]

FWIW, the stock chains are, in a word, ca-ca. I had mine for about 200 miles and she stretched and stretched and STRETCHED! A heavier duty chain is highly recommended. My .02-Gearhead