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Old 11-12-2013, 03:00 PM
motorman99 motorman99 is offline
Motorized Bicycle Newbie
Join Date: Oct 2013
Location: los angeles
Posts: 3
Default Power issues

Hello, I bought a kit used and it's fully installed but i'm still having issues getting it to run properly. The bike starts up very easily, only takes a couple pedals before I pop the clutch and it starts right up, however I have absolutely no power.

If I engage the throttle at all the engine drops in pitch sounding kind of bogged down and soon dies. I have tried to get it warmed up by riding down long hills but it won't really idle when stationary.

My question:
Could someone please go over the various issues that could cause the bike to start easily but be unable to run for any amount of time? It seems like it'd have to be something dramatic but could it be things as simple as chain tensioning? The exhaust pipe looks clear enough but I have noticed some leakage from there and around the spark plug.
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Old 11-12-2013, 04:38 PM
mr42ndstblvd mr42ndstblvd is offline
Motorized Bicycle Senior Member
Join Date: Nov 2013
Location: oklahoma
Posts: 52
Default Re: Power issues

i would start at the carb adjust your idle screw on the left side of the carb run it in all the way and turn it out 3 and a half turns. if this helps pull in your clutch and set the idle to where you want it

if your leaking oil its from your exhuast gasket if there not installed just right they heat up and melt and burn off and oil will leak all over your motor i recomend you get the thickest exhuast gasket you can and put on there i made my own out of high temp gasket material and put 3 stacked on top of each other and never had a problem but it was thinner gasket material no power could indicate that you dont have back pressure on your pipe and a leaking gasket would do that also try taking out your plug and seeing if its fouled out if so buy a new plug see if it helps try putting your thumb over the spark plug hole to check for compression pop the clutch and keep it locked and rotate the engine over while pressing down at the spark plug hole there should be lots of pressure there pushing against your finger if it was me i would suspect the carb spark plug cdi or magneto all of these are cheap and easy to replace
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Old 11-12-2013, 07:29 PM
crassius crassius is offline
Motorized Bicycle Elite Member
Join Date: Sep 2012
Location: USA
Posts: 2,787
Default Re: Power issues

I've seen main jets come out of the factory VERY rich - a new engine will also run rich till broken in. Try moving the needle down to the last notch for a while till it runs in a bit more.

note: one moves the clip up to drop the needle down
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Old 11-16-2013, 01:33 PM
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CTripps CTripps is offline
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Join Date: Aug 2011
Location: Vancouver, B.C.
Posts: 1,311
Default Re: Power issues

Make sure you tighten everything. If you're getting leaks near the plug and the exhaust, you're losing pressure/compression. That'll make any motor seem gutless.

You said it's a used motor? What fuel mix are you running? If it's already been broken in by someone else you would get less power running at break-in mix levels.


Any day that starts with a good ride is already a better day, and a bad day riding still beats a good day working.

My Builds: My Beast, Harley59's bike, my Cruiser
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Old 11-17-2013, 01:52 AM
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mapbike mapbike is offline
Motorized Bicycle Elite Member
Join Date: Mar 2010
Location: Central Texas
Posts: 5,379
Default Re: Power issues

Main jet has either fallen into fuel bowl as has been said or main jet is way to big which I have found to bethe case on all china gorl engines I have owned, sound like a good chance that its jst running very rich or you could have an exhaust that is semi plugged up.

Hard to pin it down without actually hearing it run but at least you have some things to check into.

I dont always ride WOT, but when I do..I do my best to keep the rubber side down..Ride safely my friends!
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Old 11-18-2013, 08:39 PM
slayer60973 slayer60973 is offline
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Join Date: Dec 2012
Location: West Michigan
Posts: 95
Default Re: Power issues

If it revs fine with the clutch pulled in its most likely your muffler is clogged. I had the same problem
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motor problems, no acceleration, power issues

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