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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.


spark plug half black and half grey

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
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rlberry rlberry is offline
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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
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Old 07-05-2013, 05:05 PM
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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!
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