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Im loosing my mind over this dumb bike 05 kx250f New top end Brand new head all new valves i have rebuilt the carb again rebuild kit for jets and gaskets plus ap rebuild new choke jets only jet i didnt replace was the power jet.(didnt come with one) it takes for ever to start and when it does as...

Hi All, I've been battling to get my sons PW50 started, so far I have changed the ignition coil, spark plug, ht lead and still nothing. I have taken out the plug and earthed it against the crank casing and can see a good strong blue spark but it just won't run. After around 30 odd kicks it...