Standup Scooter

[a]

Hi,
I'm new here and I don't know very much about engines or parts...
I have a 49cc standup scooter, and I can only get up to 25mph. 
I've heard that I should beable to reach at least 35mph.
 
Is there a problem with my engine?
   One thing I noticed is that after riding a few miles, the air filter feels moist with gas, and the carburetor end with the air filter drops
    liquid like gas for a few minutes after shutdown.

How can I reach higher speeds?

[Fox]

Hi a,

This forum in particular isn't really geared toward the stand up type scooters. Not to say there isn't someone here that knows about them but I think you would have a better chance of getting better advice on the Goped forum or Google the brand name of your scooter + forum and you might get a more specific forum for your exact scooter.

[90GTVert]

Myself and friends had midbikes years ago powered by the same engines as a lot of stand up scooters. 25MPH sounds about right to me in stock form. Our little bikes never went 35 until we did some work. I have noticed that some stand up scooters appear to have a tuned pipe stock. I really don't know how well they work or if they are just a muffler designed to look like a performance pipe. If they're the real deal, then 30-35MPH would be more likely. One thing to keep in mind any time you read info about speeds is to keep in mind that some people trust very inaccurate methods of measuring speed.

It's not unusual to notice a little gas on the filter. It's a piston port engine if I'm thinking of the right thing, so there's really not much to stop pressure from pushing fuel out of the carb. If you've got puddles, something is wrong, but a little gas residue is not a big deal.

It's been so long since I've owned one, I can't remember all the details. I know my aftermarket carb used high and low speed screws to tune the mixture. If the stock carb is the same way, you may want to spend some time working with those to see what settings give you the best results with a smooth idle and good performance.

The biggest change I made with my old 49cc piston port bike was a tuned pipe. Not sure what's out there for the stand up scooters, but do some research and find a good one. The right exhaust will really wake up a two-stroke. Boost bottles worked a bit. I had tried the ADA Racing "Juice Box" and the homemade boost bottles did the same thing for less money. I've got a how to about making boost bottles here... 49ccscoot.com/boost.html . I honestly can't remember how much change there was with the aftermarket carburetor. The open air filter was a good change, but it looks like most of the stand up scooters already come with that. If yours has electric start, removing that helps to wake the throttle response up. The downside I had was that the pull starters were cheaply made and broke often.

Here's the engine I had, and suspect you have. If I'm way off, just ignore my comments above.


Good luck with it. We'll answer anything we can, but I agree with Fox that there are probably forums that deal with your exact scooter and all of it's issues and upgrades on a regular basis that could give you great advice.

[a]

Thanks! Thats the same engine.
ill try another site.
As with the intake dripping, there are puddles with a tablespoon or more in volume.