Why won't my Velocity scooter go faster than 25 mph?

by Shawn Roy
(Lumberton, NC)

I changed the trans belt on my Velocity scooter in the proper fashion, but now it won't accelerate like it used to... used to go 35 plus mph, now only goes 25, and is slow on acceleration?

Any idea what might be wrong and what I can do to remedy it?

Comments for Why won't my Velocity scooter go faster than 25 mph?

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Jun 24, 2011
Same Problem here
by: Anonymous

My Velocity is doing the same thing.
Where can I buy the electric choke?


Mar 14, 2011
If only it was so simple.......
by: ScooterMan

You're dealing with the same thing most 50cc scooter owners do when the electric choke goes bad on the carb. Good news is, they cost only $19 to replace.

Bad news, running without the choke means that the scooter will accelerate even if you let off the gas. (Makes stopping very hard)

If you are not sure if your choke is bad, take it out of your carb, plug it into your electrical connector for the carb, and turn on your bike. If there is movement on the choke, then you are OK, if no movement then you can be sure that it is your electric choke.

The choke opens to give you more gas when you start the bike, and while the bike is warming up. Then the choke will close to save gas and keep a steady idle. The choke will open up again at high speeds to allow for maximum fuel into the carb.

I have the same QJ copy 50cc Chinese scooter, the Vento Zip R3i, so far I have gotten the scooter up to 44mph. I have a K&N style air filter, new spark plug (very important) and a performance CDI and Ignition Coil. Total $80.

I have also stripped all the crap off the bike that I could. About 5-7 pounds of crap.

Nothing else needed really.

My next investment into speed will be the expansion chamber exhaust pipe.

I've heard that you can increase your compression ratio by replacing the cylinder head to a thinner one that gives the piston less room to compress the air/gas ratio. Catch is that 87 octane will not work afterward. You have to use 89 octane and you really should buck up for the 93 octane gas if you don't want to hurt your scooter.

Oct 05, 2010
by: Jim Zeiser

Assuming you put the correct size belt back in, you should have roughed up the face of the variator with a light sandpaper. They become glazed and let the new belt slip a little.

Also, it might be time to adjust your valves. We had somebody with a Ruckus who had the same problem as you. After a valve adjustment, he was back up to speed.

Are your rollers in the variator in correctly? If stuck, they might hinder acceleration.

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