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2008 SXF 250 starts hard when hot

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My 250sxf 2008 has a sxs 280 big bore kit, i run JD jetting and FMF Q silencer.

I built this bike for woods and man does it work awesome. The engine runs amazing at all times, no pops nothing. After riding for a while when the engine gets hot the bike is a bear to start. If you pop start it it starts up fine. I have had the valves checked by local dealer and they said they are still like bran new with about 50hrs on the engine. Leakdown and compression test all check out great. I run 93 octane in it. I am thinking maybe it is the coil when the it heats up it possibly doesnt throw enough spark to spark the engine??

Any ideas?????

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