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Message: [QUOTE="motoB, post: 740052, member: 28816"] I hope this question is ok to post here. If not I apoligize I have a pocket bike, and a stock xr50 carb. They mate up almost perfectly, can use dremel to port and match. Now the question, can I use a 4 stroke carb for a 50cc on a 2 stroke 40cc motor? Would I need to go up or down on the main? I would really appreciate any feedback, cuz i'm getting my back side handed to me for a friend w/ exact same bike :ugg: Thanks alot motob [/QUOTE]