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Author Topic: 80' cb650c running lean...?  (Read 710 times)

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Offline weltzing

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80' cb650c running lean...?
« on: June 02, 2010, 04:58:56 PM »
when i cover the air intake with my hand it revs up, i havent adjusted the needles or anything just cleaned the carbs quite a few times to finally getting all the pipes getting hot....but i have to use the choke to keep it running.... any help here???
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Offline CBGhia

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Re: 80' cb650c running lean...?
« Reply #1 on: June 02, 2010, 10:30:04 PM »
How are the air cut off valves?   What revs are you keeping it at?  Have you messed with the carb adjustment screws?
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CB550 Cafe, GL1000, Buell Ulysses
Quote from: dave500 on February 14, 2014, 03:53:33 AM
if you dont trial spin the camshaft in the head and cover you are a novice,with no natural mechanical appitude,destined for destruction.
"The cleaner the dipstick, the closer to God." -Rev. Horton Heat
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Offline scunny

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Re: 80' cb650c running lean...?
« Reply #2 on: June 02, 2010, 10:37:42 PM »
could be low gas level in the carbs, the extra vacuum from applying your hand or the choke raises the fuel height. are you sure your float heights are correct and pilot/slow jet and passageways are clear
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Offline weltzing

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Re: 80' cb650c running lean...?
« Reply #3 on: June 03, 2010, 08:13:07 AM »
i put a clear hose on the drain of the bowls and they are at about the top of the bowl on everyone....i never touched the air cut off valves a guy on here told me that they never usually have to be replaced what revs idk because the tachometer doesnt work lol but it really revs up pretty high
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