top speed problem

[dylan]

when my 80cc 2 stroke engine hits full speed it starts to cut back and get a little bit slower what is causing this ?

 

[pghewins]

it has reached its maximum rpm for the set up you have and has likely started to go into 4 stroke it wont ever do 100 mph however much you spend on it just be happy enjoying your freedom without having to pedal

 

[dylan]

it has reached its maximum rpm for the set up you have and has likely started to go into 4 stroke it wont ever do 100 mph however much you spend on it just be happy enjoying your freedom without having to pedal

how do i make it stop doing that i want to go faster

 

[Deleted member 12676]

lean out the main jet
http://www.dragonfly75.com/motorbike/jetting.html

 

[Steve Best]

I also had this happen where it started detonating at top speed.
Higher octane fuel and/or timing retard helped, but really the answer was a better timing curve.
See Jag's CDI.

Steve