I ordered it and the 23mm got a uni air filter and threaded rod to make longer studs. The cylinder I'm using is a big bore 48mm iron sleeved. I'm wondering if it will be able to go 40 too. I'll be using a NGK plug (the thing is idk if I should have got the longer plug since I got a B5HS), one of the banana pipes, VM18 and the reed valve. I was thinking of getting the OZ magneto too and a stage I CDI. Already put alot of money into it though so probably stick to stock. I want to build a road legal bike soon maybe with a small 4 stroke honda or other japanese engine. The only problem is how to make a charging system work since in my states to make one legal you NEED lights if you want a moped registration. I was thinking GXH50 but those are pretty expensive and I'd have to mess with the governor and carb atleast that's what terry blow said in a video I would still want the Honda over the Huasheng though.