Quote:
Originally Posted by cr45
If you are living at altitude then there is a good possibility that your scooter has sea level jetting and is thus running too rich at altitude.
Try dropping the needle a couple of notches as this will lean out the mixture at part throttle.
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That may help, but if he's running 45mph with a scooter that maxes out at 55mph he's running close to wide-open, so it's mostly running on the Main Jet.