Master link derailing chain?

MarkM

New Member
Joined
Jun 22, 2008
Messages
15
Just finished my very first build and I can't keep my chain on the sprocket long enough to try and fire up my engine. It keeps coming off the chain wheel. I start off well with the correct tension. I pedal my bike, dump the clutch and the chain comes off the wheel and the chain tensioner gets twisted down 180 degrees. Then I have to dig the chain out from between the spokes and the chain wheel. I've done this three times and can't figure out how to keep the chain on trac. :confused:

I notice that the master link makes a noise or bumps as it goes through the tensioner and on to the chain wheel and counter sprocket. Could the master link be a problem? Appreciate any tips, thanks, Mark M :cool:

Chain: #415
 
Last edited:

Skyliner70cc

Active Member
Joined
Nov 17, 2007
Messages
1,340
Is your rear sprocket chromed? If so, I'd grind the chrome off the sprockets. Do this for most of my rides to prevent similar issues.

Also, check to ensure master link is lubed and not binding from being dry.
 

MarkM

New Member
Joined
Jun 22, 2008
Messages
15
Yes, the chain wheel is chrome. I'll take your advise and give it a try. I'm also thinking about removing the master link all together.

Happy 4th of July to all! Mark M :)
 

fatboy67

Member
Joined
Mar 29, 2008
Messages
107
So you say that the master link bumps when going over the chain tensioner wheel. So you must be able to have the chain rotating when the clutch is disengaged correct? My old 415 chain master link use to bump as well this was no prob. The only reason I changed chains was because the 415 stretches. Are you sure nothing is locked in the motor. I had a chrome rear sprocket, it was never a prob. Please for future reference let us know if grinding the chrome off worked.
 

Mountainman

Active Member
Joined
Jun 15, 2008
Messages
3,564
As mentioned above -- I think the way to go would be to get a chain tool and remove the master link totally -- might have to add more chain ? -- we don't want these kinds of things happening -- at high speed or any speed -- BUMMER ! Happy Riding from - Mountainman
 

MarkM

New Member
Joined
Jun 22, 2008
Messages
15
First I'm going to buy a chain tool to replace the master link with with one of the links I took off. I'll give that a try. Yes there may be an alighnment problem, could be off by an 1/8 of an inch or less.

The smaller chain Idea sounds real good to me. I'm in Fontana, CA. Where can I pick up a #410 chain? Thanks guys for your posts. Your helping me through this. Mark M :D
 

kaploink

Member
Joined
May 28, 2008
Messages
30
First I'm going to buy a chain tool to replace the master link with with one of the links I took off. I'll give that a try. Yes there may be an alighnment problem, could be off by an 1/8 of an inch or less.

The smaller chain Idea sounds real good to me. I'm in Fontana, CA. Where can I pick up a #410 chain? Thanks guys for your posts. Your helping me through this. Mark M :D

I ended replacing my masterlink with a normal link. My chain was not derailing, but the pop from the masterlink on the idler drove me up the wall.
 
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