I picked up a small 50cc dirtbike, its made by Madami the model is a pb50jr. I can barely find anything online about it, but its got a small mikuni carb with one jet. I was wondering if anyone might know what the jet size might be? and/or what size i could rejet it to. or even where to start looking to find out. Its a peppy little thing, but everyone knows you always want to make it a little better than stock. Anything else i might be able to do to get gains out of it?

Probably uses a LIFAN engine. If you'll google on that you'll probably come up with the information your looking for.

Its actually  Linmax, at least thats what the covers say on the side of the engine. And i tried that and couldnt come up with anything, thanks for the reply though

yeah sorry man wish i coulda helped you more.