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Scooters - 50cc => Super 8 => Topic started by: Super8boy29 on December 08, 2021, 10:28:31 PM

Title: New piston but top end speed decreased kymco super8
Post by: Super8boy29 on December 08, 2021, 10:28:31 PM

Hello, I have a super 8 50 2t 2014 model and I recently cracked the cylinder head so I had to get a new top end, I purchased it online and it said it was compatible for my bike.However this piston had a cut out window on it which my old one didn’t. I used to get 39-40 mph now it won’t go any faster than 34-35. Wondering if anyone knows what could’ve caused the decrease in top end speed. Thanks

Title: Re: New piston but top end speed decreased kymco super8
Post by: Mark James on April 27, 2022, 03:39:50 AM

Air leak.  Pressure test your engine.

Title: Re: New piston but top end speed decreased kymco super8
Post by: souzamoto on April 27, 2022, 03:00:27 PM

Pull the carb/intake manifold and look into the barrel. Rotate the crank till the piston is at BDC, if the cut out in the piston is still visible
 then that's your problem.