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Author Topic: CB650 runs smooth while choked.  (Read 868 times)

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Offline nivlac

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CB650 runs smooth while choked.
« on: May 26, 2013, 09:51:26 PM »
I have a 79 cb650 (my son's). I have to keep the choke pulled to get smooth operation out of it. Took it out for it's first run last night after carb rebuild over the winter. It had the choke issue before I started on the carbs. It seems to be somewhat underpowered. Aside from the lack of pep and the choke issue it runs relatively well. I'm going put a set of plugs in it tomorrow. Any ideas/ suggestions?
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Offline scunny

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Re: CB650 runs smooth while choked.
« Reply #1 on: May 26, 2013, 09:53:48 PM »
did you pull the emulsifier tube, especially yhe slow jet, these have to be taken out to clean them properly.
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Offline my79650

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  • old school 750 carbs on a cb650
Re: CB650 runs smooth while choked.
« Reply #2 on: May 28, 2013, 01:35:57 AM »
Does it idle after its warmed up with the choke off? How is the shape of the air cutoff diaphrams? Don't know more about your carbs other than needing a good cleaning. These have a press in slow jet. Can be removed.  Got no choke, i removed the butterfly flaps after i broke the plastic piece for the choke cable. Anyhow go check your valves as well. I sealed up my acc. pump diaphram holes on the air box side with silver solder for metal($25 plus for new ones). My pd50 stock carbs woildn't idle until i did this. You can try it if yoou want to if you decide to pull the set and clean them properly.
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Offline my79650

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  • old school 750 carbs on a cb650
Re: CB650 runs smooth while choked.
« Reply #3 on: May 28, 2013, 01:37:59 AM »
9:00 on the air side is the hole for those expensive diaphrams. Mine would idle good when i did this. Not perfect but it would idle.
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