I have a 2002 derbi gp1 and had the metrakit 70cc big bore kit put on as well as the metrakit sp carbon fiber exhaust. The bike flies but when i get up to about 55 mph the it sounds like it wants more fuel and starts sputtering, and will sputter for a while as i feather the throttle and wil get up to about 65 but with alot of sputtering. I have the original dell orto 17mm carb on it. My question is, do i have to re jet the carb or shoud i buy the dell orto 19mm which i have heard may solve my problem. If anyone can help please do. Thanks, Jeff.
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