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Join Date: Oct 2011
Location: Jacksonville, NC
Rider in the Light,
First, the recommended idle speed for our bikes is 1100 rpm +/- 50.
Now got at few questions to you and i mean no harm with them, are you sure your are applying and turning off the "choke" correctly? To engage the enrichment circuit the pulled as far as it will go toward the rear tire, and pushed toward the front tire to disengage.
Also when you go to start your bike, you will most likely need to leave the choke on to some degree, for a few minutes. This gives the cold engine the extra fuel that it needs to keep going. If you are taking the choke off too soon, and using the idle adjuster to regulate engine speed, that could be a cause for your problem. So make sure next time you got the bike going, that you warm it up fully, prior to playing with that adjuster screw.
Socond thing that pops into my mind is a carb problem. Possibly an air leak, or something that cause the bike to run lean. Check the intake hoses for cracks (easy way is to spray carb cleaner all around the boots and see if idle speed goes down, if it does you have an air leak).
Just some thoughts, i am by no means an expert, you have come to the right place and i am sure that someone with more power than me upstairs will be by soon to help.