MOPED ARMY

compression and a pipe that hits at the same rpm your clutch does that tops out at 50 i would try a dirt bike expansion chamber should get you some more bottom end.

not actual knowledge just read junk

A 15mm carb or drill yours with a 19/32 drill bit or more radically a 5/8ths. You don't need such high gearing. How do you get on the pipe? You can get the speed through higher RPM. Those high gear sprocket combos do best for a high torque cyl. Assuming you have the all aluminum nikasil cylinder widen the transfers in the cyl and raise them only 1mm. If you put a stone wheel on the dremel and put the tool in the cylinder with the stone perpendicular to the cyl bore you can do it. Raise the exhaust port 1mm and go as wide as possible minding the ring gaps. A 6P Homoet would be better. 16X45 sprockets will get you there. A Simonini pipe is a bit better yet. You will probably be too rich at the bottom if you have the right jetting at the top. You could get a 16 PHBG to remedy that. I f you have the double number cyl it will all be different

You must be doin' something wrong... I ported a stock 1hp cylinder, and got up to 38mph gps with a stock pipe and 12mm bing. I had decent low end with 16/45 gearing.

Your gearing might be too tall. Actually lowering your gearing will give you better low end, and the top end will be nearly the same. I think your problem is that you are hitting the point where you can't put out any more hp and therefore your bike will only go so fast no matter how tall you gear it. Try 18/45.

what are the port maps for the #22 cylinder?