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2007 Rancher new carb will idle then a very high rev anybody had this problem?

959 Views 8 Replies 5 Participants Last post by  TRXStudent
I put on a aftermarket carb and didn’t adjust anything normally they work fine. This one upon start will idle for s second then rev up really high for a few seconds then back to idle and keeps repeating. Also the speedometer got some water in it and needs replacing would this make it cause that problem? TIA David
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What ATV is it?

The main issue is the aftermarket carb, scrap it and buy a used known good OEM replacement and overhaul with an OEM or known good brand service kit such as shindy.
It’s a 2007 Rancher
Are you sure it's a 07? Thats the year they started putting fuel injection in the rancher and made it a 420, or did you put a new throttle body on it?
They said it was a 07 and this is what it looks like.
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