Thread: spark plug gap
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Old 04-07-2009, 07:25 PM
philymitch's Avatar
philymitch philymitch is offline
Motorized Bicycle Senior Member
Join Date: Feb 2009
Location: Fresno CA USA
Posts: 94
Default spark plug gap

How does the gap for the spark plug affect the way the motor runs? My spark plug is gaped at .025 and my motor will spit and sputter a little. My motor ran fine with the old plug that I had in it so I don't think it is rich or lean. When you change the plug style do you have to play with the gap to see where the motor runs best at? Should I increase the gap by .005 each time or what is a good number to use in this case.
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