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fast idle issue

kcsteve

CB750 New member
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lees summit mo
My son in law finally took his ( new to us) 1982CB750C for an extended ride this morning. After the bike was well warmed up the idle rpm was 3000 to 3500. Nothing he tried seemed to lower it. The bike ran great otherwise.
It started from cold with just a little choke and idled at 1000. After about 15-20 miles the idle was 3000. When he got back we tried the starter fluid on the carb boots, but the idle didn't change. I'm fairly mechanical but I've never worked on bikes so any advice will be greatly appreciated.
 
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