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I just picked up a 2001 kawasaki lakota 300 from the original owner. When I got it, it back fired a little but other than that it worked perfectly. He said that it just needed a new carb and everything would be good. Fast forward a couple days and I put a new carb on and its still not running right. I did a little reading into what could be causing it to backfire. I have adjusted the air/fuel to around 2 turns out, checked valve clearance and changed the air filter. After doing all of that it idles perfect and revs up nice, but as soon as it goes into gear it backfires and bogs down. It gets worse as it gets up to temp. I don't know what it could be. Any help would be greatly appreciated.
 

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Try this. Partially tape off the air intake. See if it runs better or worse. Backfiring into the airbox
indicates it's lean. If you replaced the carb with a Chinese knockoff it's probably not jetted for
your quad. If nothing changes I'd take a look at the cam timing. It could have jumped a tooth.

Mad
 
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