2005 Honda 300EX putters out

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I have a 05 300ex, i ride for about an hour when its good and warmed up and during the end of the 1st, 2nd, 3rd gears it putters out. Rides fine before its really hot, kinda stumped. Changed cdi, still doing it. Rejetted, still doing it. New plug and actually new carb too. I also have white bros pipe and kn filter. Valves are moving good. Thanks

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Have you checked the valve lash? An external oil cooler helps keep engine temps down. You could also try running a cooler plug, it will allow more heat to dissipate from the combustion chamber.

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