i have a new sbp exhaust on my 66cc chinese bike. now its sluggish in the top end

[Pablo]

It came with some bubble wrap, some bubble gum and some appleheads.

????

 

[motorpsycho]

it's normal for these engines to spit gas back out of the carb and into the air filter because there are no reed valves. reed valves are one way valves that go in the intake port. they allow gas and air to get into the engine, but they will not let the gas get spit back out into the carb and filter.

 

[brandenclrk]

yea, just the expansion chamber and some candy.

yea just the sbp expansion chamber and some candy. I ordered it from www.piratecycles1.com. Oh yea they also sent one of their stickers with their logo and some business cards. Sticker ain't goin' on my bike now. Sad thing is it was my first time buying from them and I would've probably ordered more parts if they didn't leave me hangin with no instructions whatsoever.

 

[Ghost0]

Since they get the expansion chambers from us they should at least give you a link to the instructions. Here it is.
http://www.sickbikeparts.com/Manuals/Tuned Pipe Installation Instructions.pdf