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Scooters - 50cc => Super 9 => Topic started by: Dieselcamino on July 08, 2023, 12:25:54 AM

Title: Super 9 runs great but no power
Post by: Dieselcamino on July 08, 2023, 12:25:54 AM

Hey everyone, I'm working on a (new to me) super 9 2stroke liquid cooled,  I've just rebuilt the carb and did a new spark plug and battery.  Starts right up and idles nicely, but once you go to take off it has almost no power. On flat ground it can maybe get up to 10mph, on a hill you have to kick and help it along. Motor sounds fine though.  Does anyone think I should be looking at a CDI issue or a cvt problem?
 Should also note it is tough to push around not sure if that is normal. I can walk a full size motorcycle easier than this.

Title: Re: Super 9 runs great but no power
Post by: Neil955i on July 08, 2023, 08:36:58 AM

Do the wheels spin freely when off the ground?

Oh yeah, welcome to the forum!

Title: Re: Super 9 runs great but no power
Post by: Dieselcamino on July 08, 2023, 10:53:47 AM

The front does but the rear takes a lot of strength to turn it at all, not sure if that's normal on a cvt,

Title: Re: Super 9 runs great but no power
Post by: Ruffus on July 08, 2023, 01:12:53 PM

Would do a compression test. My guess is on a two stroke, worn out piston or rings or both.

Title: Re: Super 9 runs great but no power
Post by: Stig / Major Tom on July 08, 2023, 01:34:36 PM

Should not take a lot of strength to rotate rear tire up on the center stand.
I'd take a look in the CVT.....for a mouse nest....or?
Stig

Title: Re: Super 9 runs great but no power
Post by: Neil955i on July 10, 2023, 10:43:50 AM

Quote from: Stig / Major Tom on July 08, 2023, 01:34:36 PM

Should not take a lot of strength to rotate rear tire up on the center stand.
I'd take a look in the CVT.....for a mouse nest....or?
Stig

Or even a binding rear brake caliper?...

Title: Re: Super 9 runs great but no power
Post by: jmacken37 on July 28, 2023, 06:09:50 PM

This does not sound like a piston is blown. I'd check the CVT and the brake.