This is an odd question but I'm at a loss 50cc Maddog

[Jbower]

Hello everyone,

I purchased a 2022 Ice Bear Maddog Gen 1 with a 50cc motor. The engine is a 1P39QMB.
Since I've had it I replaced a couple items.
* Installed a PE19mm Nibbi Carburetor with the open air filter attachment.
* Changed the stock CDI box out with the Red AC
CDI box
* Installed new throttle cable (to fit with the
Nibbi carb)
* Replace the fuel hoses with better quality clear
hoses
* Removed the center portion of the exhaust pipe
so it is now open straight through.
* Changed the oil with new oil.
* Replaced the spark plug.
This is pushing 30mph on flat road. It feels like something is holding it back from going and faster.

So for the odd part. We put it on a lift in order to lift up the back tire and started it. I wanted to see what it would do. We were shocked! The no rev limiter works as the rpms kept on climbing and that tire was flying. It was doing and sounding like what it should have been doing on the ground. It can't be my 6' self at 210 pounds that drops this from being a beast to a turtle.

What would be stopping it while it is on the ground from pushing out the hoarse power and speed that it got on the lift? I am thinking it has something to do with the CVT assembly. There is no restrictor on the variator as we checked it already. But to me it's pointing to something in there. If it's a belt, variator or clutch I do not know.

Any help would be greatly appreciated.

[kz1000st]

My opinion would be look for vacuum leaks. Start the scooter and listen for a hissing sound. It could be a cracked manifold or hose. Go simple before digging in search of the unknown.

[VOLD]

my moped used to go 60km on flat and the way i figured out something was wrong was when i went downhill achieved the top speed of 90 and it just kept going without loosing speed on flat ground. My rollers were too heavy and my variator couldnt open up all the way. the hill helped my variator open up. I made my rollers lighter and it worked. it would be helpful to know what rpm your scooter is at when you are going max speed.