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Discussion Starter #1
So I have a 2002 trx 450es that was given to me. The last person to ride it told me that it was backfiring a lot on decel and then it died and would not crank anymore. So I've checked for spark with a brand new ngk plug and it did have a bright blue spark against the frame. I've checked all the wiring. Adjusted both intake and exhaust valves to .006. Bought a new carb and installed properly. New oil cooler. Checked the timing chain tensioner, which is all good. Checked the fuel delivery, which has no issues.
Since all the new parts it turns over just fine and seems like it has really good compression (using the old finger over the plug hole trick) but it will not run. It just lets out a shotgun type backfire out of the exhaust. Anyone got any ideas?
 
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