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07 KX250F won’t start

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I bought this bike with a blown motor. I have replace the crankshaft bearings, new pro circuit hc piston, new valves all of it. Finally got the bike put back together. The bike will not start. I get a back fire every now and then but nothing more. I have rechecked my timing multiple times. I checked the spark and it’s getting good spark(new plug). And I have cleaned the carb and I’m for sure getting fuel. I don’t know what else to do at this point.

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Oh and forgot to mention I did put a new cylinder and a new head on the bike as well. Any help is greatly appreciated

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