chain popping

[imSRB]

so I have my 35# or 40# chain on my 60T sprocket and my 10T clutch, and i had to put to links in it to reach but ever time I start up my engine and rev it the chain pops off what could it be? please help me cause this is the last thing I have too do to my kart and then i'll be down the rode so any help would be greatly welcomed

 

[freakboy]

wrong size chain for wrong size sprockets? chain to loose? not ligned up good enough?

 

[imSRB]

well I don't now what size chains are so if you could tell me how to determine how, and alighnment should be good so i don't now but if the chain sags a little is that to loose, thanks

 

[freakboy]

ok well it shouldnt sag down more then bout quarter inch? not exactly sure tho and someone should chime in a little while here to help you determin pitch and all that.

 

[imSRB]

thanks for the help i'll post pics up when I get it running. hope I get some more help

 

[anderkart]

Here's some chain sizing info: http://www.lawnmowerpros.com/Azusa/Azusa-Roller-Chain.asp
You should be able to use this same info to help confirm what pitch sprockets you have.

If your chains are the corect size for your sprockets, make sure everything is perfectly lined up and you have about a 1/2 or so of freeplay in your chain. Then if your still having trouble, your probably fighting a wore out or meybe a defective chain and/or sprockets and its time for some new ones.

 

[imSRB]

i'll try that i just have to go measure it?

 

[bajagokart]

most common chain sizes are #35 and #40 or #41
you can tell what it is by measuring in between the teeth on your sprockets
#35 is 3/8"
#40,41 is 1/2"

 

[Doc Sprocket]

I would think it's be pretty obvious if the chain and sprockets were not of the same pitch, but check all the same. If you can, lay a straightedge across the face of both sprockets to check alignment. Not only do they have to be inline with each other, you need to make sure they're dead parallel. Perhaps your engine had twisted slightly on it's mounts. Another thing worth checking is to go over every link, wiggling it to make sure you don't have one that's stuck or very sticky. That'll throw the chain every time.
Cheers- Chris

 

[Linksep]

The chain size may be stamped on the outer links, look for a number. How's the clutch bushing feel? If there's a lot of slop you may have to replace the bushing or clutch.

 

[imSRB]

thanks guys, I'll go check all that this weakend its a little too cold out to do anything. but thanks for all the help! ;=)