I put a reed valve kit on my 80cc 2 stroke from bikeberry and I bought the windowed piston off of ebay. I measured the stock piston before buying the windowed one and measured it when it came in the mail, and it is the right one. My problem is, is it will idle fine, but when I go to accelerate, it basically shuts off under full throttle. If I go easy on the throttle, it will stay running but has very little power. Such little power thatr I have to pedal it sometimes to help it get the RPM's higher. Once the RPM's get up there, it runs fine and has good power. Any ideas? I did put a bigger jet in it after the reed kit install. I'm stumped. Any help will be appreciated.