Quote:
Originally posted by fastpat
Thanks for the info, Tim.
Something to consider on your aircooled, if it has a carb with a pilot jet, try fattening it up by one size. I had a '86 Yamaha, though watercooled, it was jetted for low emisions in California. It had a nasty low rpm lean stumble, and ran hot as blazes in town with the cooling fan on nearly constantly instop and go. I replaced the pilot jet, by one size, and the stumble disappeared completely, and the cooling fan rarely came on even while idling during carb synch checks. I don't know your carb type, but you might want to experiment a bit.
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I have my needle all the way up (rich) and my idle air screw cranked in a bit to richen the idle thru low throttle setting which is just right during cold weather but is indeed a bit rich during hot weather. So I am allready pretty rich during the summer. It just does not have enough cooling ability on an 85 degree humid spring/summer day while running in low gear (somewhat high rpm) yet moving slow thru the air.
Thanks for the tip though, it sounds like you might have been a dirtbike racer also once upon a time. 
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