20mm carb upgrade.

[locxdog]

I need some help. I upgraded my stock carburetor on my gy6 50cc motor to a 20mm carb. It came with an 82 main jet. I am not seeing an increase in speed from my stock carb. Should I upgrade the jet size? If so what is a recommended size I should start off with. I dont want to take the carburetor apart so many times. Thanks!!

[FrankenMech]

Does not sound like an 'UPGRADE' to me. Unless you are prepared for a long session of carb tuning put your stock carb back on.

[GrumpyUnk]

Nickel to a donut hole Frank hit the nail right on the head. A stock 39mm will not give much appreciable increase in performance with a larger 'upgrade' carb. Most sold are actually the same size, and if you want to get buried in words, find this link:

49ccscoot.proboards.com/thread/11639/real-20mm-carburetors-fakes-pictures?page=1#scrollTo=395063

Then read a dozen more pages...
tom