Hello All:
I have tested and the quad will go all but full throttle.
It bucks back and forth at full throttle.

always starts right up no issues:
It has new oil and filter, new gas filter, new plug and proper gap, has new carb kit and doing the same thing as before all of the new stuff.

will run 1/4 throttle and 1/2 throttle but full it bucks like a mule

what to check ?
timing?
gap of valves
cam lobe worn on exhaust side?

HELP!

Thanks all