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Discussion Starter #1
Okay so I change a 47 cc piston into a 49cc piston it starts up good
But it have alot of vibration and the pick up is really bad
But once it starts going it's pretty fast. I don't know what the problem is.
 

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I will look at the spark plug tonight. Do you think it maybe firing wrong?
I think youre gonna see a whitish grey plug which means youre running a bit too lean.....

You may also have the squish too tight because of the piston youre using and may have to index the piston top with emery paper for proper squish clearance between piston top and head dome
 
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