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I got an 05 660. The silencer in the exhaust was removed by the previous owner. And I have a 10:1 high compression piston. K&n filter also. Elevation is around 100ft or so. It has stock jets right now and mid to high performance is pretty bad( back firing, popping) so what size jets should I get?
 

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One of mine has a 10:1 piston, stock head, DG exhaust and KN filter in the stock airbox. Running needle down 1 notch, mains are 170/167.5 and pilots are 25's. I am at 1300 feet and 50deg out.
 
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