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2010 Crf450R won't run

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Earlier this summer I was ridding my bike and it was working fine down a trail until I went to pin it. When i did there was nothing but a massive hesitation before after bucking and spitting before it would start to pick up speed. After this the bike would run but it would stall at random times but always start right back up until eventually it wouldn't start anymore, not even fire. There is spark, gas, in an attempt to fix it new piston, valves were put in but this didn't fix it and in a last ditch effort a whole new cylinder head was put on it and still nothing. After this I doubt it is mechanical, everything is to spec and it cannot be figured out, if anyone has run into this or something similar or if you have any ideas it would be much appreciated.

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Dirty fuel filter on the fuel pump inside the tank

Edited by Aus450

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