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Motorized Bicycle Trouble Shooting Use this area to post problems that may arise, if you could use some help in figuring out what is wrong with your engine and what needs to be done to achieve top performance.

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Old 07-05-2013, 04:16 PM
rlberry's Avatar
rlberry rlberry is offline
Motorized Bicycle Member
Join Date: Apr 2012
Location: Rockford, IL
Posts: 22
Default spark plug half black and half grey

One of my bikes has a spark plug that's half black (kind of shiny) and half grey. I have never seen this before. I had to adjust the clip position in the carb cause it was flooding the engine so I moved the clip up one notch and now it's at its highest position. It runs fine but feels like it's running lean as it bogs at wot. Has anyone come across this issue? Any suggestions would be much appreciated. Thanks
Ride Hard w/ Ride Hard Motorbikes
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Old 07-05-2013, 05:05 PM
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maniac57 maniac57 is offline
Old, Fat, and still faster than you
Join Date: Oct 2011
Location: memphis Tn
Posts: 4,486
Default Re: spark plug half black and half grey

Go back one notch. That is about right for good durability vs. power.
It should pull clean under acceleration and four-stroke a bit when loafing along.
Further tuning will not give much more power, but can easily go too far and cause trouble if you are not experienced reading plug chops.
Be aware you can destroy any two-stroke in short order running too lean.
Err on the side of caution for a happy durable chinagirl!
If more is better, then too much is just enough.
If you can't afford it, build it yourself.
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