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jkv45 · July 18th, 2022, 07:25 AM

Danno pretty much has it covered. Doing carbs right isn't quick or easy.

Many times, hanging RPMs means a vacuum leak -but it can also be just a lean condition due to improper adjustments or partially plugged carb circuits.

Did you remove the idle mixture caps, idle mixture screws, clean the passages, and check that the o-rings are in good condition?

Most of the time, when everything else is correct, setting the idle mixture screws to 2-turns out initially gives you a good place to start.

After it's fully warm, I will adjust the screws to get the highest RPMs at idle, go about 1/8-turn out (richer), then set the idle speed to 1200 or so.

Syncing the carbs is also a good idea before fine-tuning the mixture screws.

July 18th, 2022, 07:25 AM	#3
jkv45 Rev Limiter Name: Jay Location: WI Join Date: Jul 2013 Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes Posts: A lot. MOTM - Jun '18, Oct '16	Danno pretty much has it covered. Doing carbs right isn't quick or easy. Many times, hanging RPMs means a vacuum leak -but it can also be just a lean condition due to improper adjustments or partially plugged carb circuits. Did you remove the idle mixture caps, idle mixture screws, clean the passages, and check that the o-rings are in good condition? Most of the time, when everything else is correct, setting the idle mixture screws to 2-turns out initially gives you a good place to start. After it's fully warm, I will adjust the screws to get the highest RPMs at idle, go about 1/8-turn out (richer), then set the idle speed to 1200 or so. Syncing the carbs is also a good idea before fine-tuning the mixture screws.