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 | Bwing96
Join Date: Jun 2009 Posts: 16 United States 
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2009-07-26 164356
My 04 HPX idles so low that it's almost hard to tell when it's running when cranking. After it warms up it still seems to be sluggish or slow to respond when accelerating and surges a bit when trying to hold a constant speed.
What are the two little plastic looking things on top of the carb ? Do they have anything to do with mixture settings? What is the proper positioning of these?
I tried to find a description of what they might be in the online manual and parts look up but found nothing.
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| gatoraider
Join Date: Nov 2008 Posts: 544 Maryland 
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2009-07-26 164357
Those two little plastic looking things are air/fuel adjusting screws. You need to warm your engine and then adjust each one, one at a time,to get the highest RPM. You may have to go back and forth because when you get one right it could throw the other off a little. Iam thinking that your carb may be clogged up on one side, it happens on HPXs alot. Feels like it's running on one cylinder. If it is,adjusting the screws won't help. ....
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| Bwing96
Join Date: Jun 2009 Posts: 16 United States
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2009-07-26 164362
Do you adjust the knobs at idle or wide open throttle? ....
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| gatoraider
Join Date: Nov 2008 Posts: 544 Maryland
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2009-07-26 164365
At idle with engine at operating temperature. ....
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| Bwing96
Join Date: Jun 2009 Posts: 16 United States
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2009-07-28 164456
Made the adjustments today and man what a difference. It no longer surges and readily accepts rapid acceleration. The little knobs are fully turned against the stops but it works.
Thanks Gatoraider. ....
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