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Hello. 

I am writing to you about some problems I have with my scooter.

Kymco super 8 4 stroke 72cc.



I hope you guys can help me out.

My scooter do not really reach high rpms when I give it full throttle, as you can hear in this sound clip



Which in turn limits my top speed..



I have removed the following restrictions:

Cut one of the small wires at the cdi box.

New sliding tube and new polini variator 4.5 gr.



In addition to a 72cc bbk I've also fitted a larger cylinder head with bigger valves. I have had to increase my main jet size, following the installation of the new bigger cylinder head. Right now I'm running with a 110 which I think is pretty high. I have also tried higher and lower main jets with no increase in performance. The rpm does not go up nor does the top speed.



I have thoroughly checked for leaks but found none.

The scooter starts immediately and keeps idle fine.



Timing is correct and valves are adjusted.



My setup:

72cc gy6

47mm cylinder head 21 in / 19 out

Performance camshaft

Polini variator 4,5 gr

Unifilter

Leovince exhaust

15% stronger torque spring

Stock carburator