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Hey all, I bought a 07 Yamaha rhino 660 project. I starts up just fine but when I step on the gas it starts to rev up and then tries to die. It also backfires. It has a chinese carb on it, but I got the mikuni with it that I will be going to rebuild. Any ideas what could be causing this and what a stock carb should be set at? Also, what idle speed should I set this at. As always, thanks for your assistance.
 

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Check all the basics. Everything tight, no vacuum leaks? Sufficient fuel getting into the carb float bowl, float level correct, air filter and intake ducts clean with no obstructions? That's where I would start. Since it's idling, don't think it's an ignition issue.
 

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Racer,
I took of the Chinese carb and rebuilt the mikuni but when I was taking it apart I found the rear boot from the carb to the intake had a big tear in it. I ordered one and am waiting for it to come in. Will let you know what I find out. Thanks for the assistance.
 

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Racer,
I took of the Chinese carb and rebuilt the mikuni but when I was taking it apart I found the rear boot from the carb to the intake had a big tear in it. I ordered one and am waiting for it to come in. Will let you know what I find out. Thanks for the assistance.
If you have a tear in that rubber boot, that will cause a huge vacuum leak, which will in turn cause all kinds of problems. Once you replace that it'll run much better.
 
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