Author Topic: Seeking clever tricks on how to rectify an air leak without removing the carbs.  (Read 349 times)

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Offline Autoground

  • 1980 CB650c
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Hi all, long time.

1980 CB650. Carbs are dialed in right, but I had sudden onset intermittent lurching. I sprayed some lube around the carbs and saw some changes in RPMs, but the smoking gun was leaning in and hearing a hissing noise from the rear of the carbs (as in towards the airbox) when opening the throttle.

Please god, don't make me have to take these carbs off again. Who's got a story of having fixed an air leak without removing the  the carbs? I'm beggin ya.
1980 CB650c

Offline OldGreyBeast

  • Enthusiast
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  • Posts: 135
  • I like motorcycles.
I changed the intake manifold o-rings on my bike without actually removing the carbs, just shoved them back enough to get the new o-rings in there.

One of my bikes a previous owner solved a leaky airbox boot problem by just absolutely slathering it in silicone.  It's not pretty, but in his defense it did work.
1974 CB550, 1975 CB550, 1976 CB550, 1986.5 Nissan D21, 1987 Mercedes 190D Turbo, 2010 Mercedes E350, 2016 Suzuki GSX-S1000

Online Deltarider

  • Really Old Timer ...
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  • ... but some animals are more equal than others.
An airleak has to be diagnosed first. Just replacing them is not a good strategy. On my bike after all these years and all these miles only one of them leaked, this after a mechanic had reinstalled the manifold incorrecly. The other three are still the originals the bike got at the assembly line.
CB500K2-ED Excel black
"There is enough for everyone's need but not enough for anybody's greed."

Offline carnivorous chicken

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If it's behind the carbs, even something like shoe goo will plug an air leak if it's cracked rubber or plastic. But you've got to find out exactly where it is, which will eliminate the need to just slather something everywhere.