What do I need to do to get the power back on my scooter?

by Chris
(Virginia Beach, VA)

150cc scooter starts and idles great but sputters over speeds of 25mph... I have a SC150cc Baja Scooter with 688 miles on it. Starts and idles great. Spark plug and oil changed at 500 miles. The problem I am having is when I am driving 25mph and up the scooter sputters and does not go over 40mph.

I have drained the tank, changed fuel filter added new gas. Still the same response from the scooter. This scooter would go 50mph with me and my girl friend on it. What do I need to do to fix the scooter so it does not sputter and get its power back?

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Aug 31, 2012
Work around for lose of power at 25 mph NEW
by: Rick

I have 3 150 cc bikes that all have displayed this same behavior. They are different manufacturers and even different years of build (all chinese bikes). One started experiencing the issue at 100 miles. The second at 1 year old and 4000 miles. The third at 2 years and 2000 miles. The temporary fix that has worked on all three is to remove the rubber intake hose at the carburator and run without a filter. Note the key is no intake manifold. IE, you can remove the filter and leave the filter cover off and it will not work any better (ie, not a blocked filter). I have rebuilt the carburator without any improvement. I call this a work around as it does mean you are running without an air filter and I am still trying to get to a root cause, final solution. can

Jul 14, 2012
Same NEW
by: Allan

I also have a very similar problem. It would seem that a simple air/fuel adjustment on the carb would not suffice. I have tinkered with it back and forth and even cleaned out the carb. Perhaps for a new scooter, however, that could be all it needs.

Apr 23, 2012
A few more items to inspect NEW
by: Anonymous


Have you checked your air to fuel ratio on the carburetor, it might need to be adjusted.Since you have low mileage it could only need to be adjusted. I also have a problem with having power and next not having much power and I found out that it could be the CDI unit. I am not at home right now so I cannot give you specifics but check these two things starting with the carb adjustment. Hope this helps.

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