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Carb numbering question
Posted: Wed Jan 21, 2026 5:59 pm
by dswassy
Hi all,
I have an R80/7 with 32mm Bing carbs. (64/32/321 & 322). My question is this:
Do the carbs need to be a matching pair or can I install a similar spec (64/32/324 for example) on one side? I am having an issue with my right side carb where the idle mixture screw in raises the idle instead of dying out and I think it could be the carb itself.
Re: Carb numbering question
Posted: Wed Jan 21, 2026 6:30 pm
by Kurt in S.A.
Generally you can mix and match, but there are subtle differences between carbs especially when they are that close in numbers. In looking at the Bing chart, the only difference between a 322 and a 324 is the slide...other settings seem to be the same. I don't know what the difference is with the slide, but it's got a different "part" number per Bing. But the real thing that's needed will be to adjust/synch the carbs once they are installed.
Kurt
Re: Carb numbering question
Posted: Wed Jan 21, 2026 6:33 pm
by SteveD
- BING jetting chart.jpg (930.61 KiB) Viewed 724 times
Re: Carb numbering question
Posted: Wed Jan 21, 2026 6:51 pm
by dswassy
Thank you both
Re: Carb numbering question
Posted: Wed Jan 21, 2026 9:32 pm
by gspd
dswassy wrote: ↑Wed Jan 21, 2026 5:59 pm
...(turning) the idle mixture screw in raises the idle instead of dying out...
Your idle circuit is blocked. It's clearly illustrated in the third link in the first post here:
viewtopic.php?p=130523&hilit=BING+INFO#p130523
Re: Carb numbering question
Posted: Wed Jan 21, 2026 9:52 pm
by dswassy
gspd wrote: ↑Wed Jan 21, 2026 9:32 pm
dswassy wrote: ↑Wed Jan 21, 2026 5:59 pm
...(turning) the idle mixture screw in raises the idle instead of dying out...
Your idle circuit is blocked. It's clearly illustrated in the third link in the first post here:
viewtopic.php?p=130523&hilit=BING+INFO#p130523
Boy, if this turns out to be the reason, I am buying you a beer. I have flushed it out numerous times but will try again.
Thanks
Re: Carb numbering question
Posted: Wed Jan 21, 2026 11:09 pm
by SteveD
dswassy wrote: ↑Wed Jan 21, 2026 9:52 pm
gspd wrote: ↑Wed Jan 21, 2026 9:32 pm
dswassy wrote: ↑Wed Jan 21, 2026 5:59 pm
...(turning) the idle mixture screw in raises the idle instead of dying out...
Your idle circuit is blocked. It's clearly illustrated in the third link in the first post here:
viewtopic.php?p=130523&hilit=BING+INFO#p130523
Boy, if this turns out to be the reason, I am buying you a beer. I have flushed it out numerous times but will try again.
Run a fine wire or a piece of fishing line thru the hole, then flush it well.