KLE wont rev flat out smoothly when riding
i have totally rebuilt my kle apart from the engine, which is a recon engine.
It ticks over lovely and revs when stationary cleanly, but when riding it and you give it a handful it stutters and stammers (no back firing though) then runs smooth and then stutters and stammers, i have cleaned all of the carbs out, and it has not been rejetted any ideas of what to try next? could it be something earthing out? dodgey plugs?
any help gratefully recieved