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Old 01-22-2013, 05:48 PM   #1592
ORexpat
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Joined: Jan 2007
Location: West of Seattle . . .
Oddometer: 2,759
Shimming the needles affects the main jets, which come into play, so I've heard, around 3000 rpm or thereabouts.

I did the same thing, but all it did for me was use more gas without much other effect. So I took the shims out. (Pretty easy to do--much easier than the pilot jets. And easy to reverse if it doesn't work out).

YMMV . . . . .
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