ive had the bike going on my 4th season, the first 3 seasons i barely ever opened the throttle wide open. the engines in great shape i think.............
when the throttle is wide open the engine boggs down, just changed the spark plug......... the old one had black tar like stuff on the outer rim of the plug, and only 8 rides or so on that one. i assume its over fueling, took the carb apart, all the jets everything is crystal clean, the float appears to be seating the inlet valve correctly, i adjusted the depth of the jet needle both ways, leaned out the pilot s***w which supposedly corrects your fuel input similarly to adjusting the jet needle.
i dont know what iam missing here, unless the throttle position sensor is done/ out of adjustment, maybe it doesnt have enough compression for open throttle( top end rebuild), the hot start valve isnt seating?
also my chain put a hole in the crankcase, if backpressure is required in the gearbox i dont know
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