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Old 10-16-2019, 05:18 PM
Weezy Weezy is offline
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Default Firefox 620 - Need Help With Chain

I have a Firefox 620 go kart with a 6hp Mitsubishi motor. The kids managed to break the chain and I was not able to locate it so I could order a new one. Any help in determining what chain goes on it would be most appreciated. I did a search in the forum and found someone with a similar situation but the post was closed and I could not reply on that post. Newbie here. Hopefully someone can point me in the right direction.

From what I have read, I need to count the teeth on the sprocket???

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Old 10-16-2019, 05:46 PM
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No, tooth counting is not necessary.
With a tape measure, please measure the distance between teeth, as well as the width of the teeth.
If it's 3/8" between teeth, it's 35 pitch chain.
1/2" between teeth means 40, 41, or 420 pitch chain.

P.S - Just so you know, asking your own question in someone else's thread is generally considered rude. Just a note for the future.
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Old 10-16-2019, 06:57 PM
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JT - I need to measure the teeth on the large sprocket correct?

If it’s the 40, 41 or 420 chain, how do I know which of these to purchase or is it the same?

Sorry if this is a dumb question, I’m not savvy with this stuff.


Thanks for the advise.
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Old 10-16-2019, 07:18 PM
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40 chain will be narrower than 41 and 420.
420 is the heaviest duty.
40 chain is 0.312" wide, and 41 and 420 are 0.25" wide.
The sprocket is generally the easiest to access to count the teeth.
Not really a dumb question, happy to help!
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Old 10-16-2019, 07:20 PM
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Assuming it’s one of these (40, 41 or 420) how would I narrow down between these to know which one I need?
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Old 10-16-2019, 07:25 PM
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If the sprocket teeth are ~0.312" wide, you will need 40 chain, since the others will be too narrow.
If it's 0.25" wide at the teeth, you can do any of the 3, but I'd do 420 for extra durability(your kids already managed to break the chain once *hint hint*.
Chances are it's 35 though.
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Old 10-16-2019, 07:41 PM
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Great info and I’ll have the kids karting again in no time!!!
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Old 10-16-2019, 07:42 PM
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Glad to hear it! It'd be hard to find a kid that wouldn't smile after riding a go kart!
From the sounds of it they're *cough cough* enthusiastic with their driving.
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Old 10-16-2019, 08:32 PM
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Talk to these people, looks like they carry or know of that belt.

https://alpha-sports.com/Parts/AS_FI...omberlin-parts
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