Dellorto main jet size

Hi, I've got a 50cc Suzuki Minicross, with an upgraded racing exhaust system, and the bike heats up too quickly, signifying the main jet being too small. its a 12mm dellorto, but i want to change the jet, not the whole carburetor... it currently has a 64... any suggestions at a rough size to upgrade to??

Re: Dellorto main jet size

The #64 is pretty big for a 12mm carb.

What does your plug look like? Any color showing?

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