Re: 1980 CB750K Carb Issues

Posted by rhinocb750k on May 29, 2013; 10:05pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/1980-CB750K-Carb-Issues-tp4041372p4041465.html

Thanks for info. Where can I get the rubber boots?

Sent from my iPhone

On May 29, 2013, at 9:42 AM, "seestheday [via Honda CB750'S]" <[hidden email]> wrote:

yes, I think the SOS only came about in 1981.

You say that your rubber boots that are going into the airbox are torn.  That might be your issue.  The rubber boots act like velocity stacks that pull non turbulent air from within the airbox.  If you have rips/cracks messing up how air is getting pulled in it could cause some cylinders to run lean.

Can you fix the cracks with some silicone or even tape to see if it helps your lean condition?

Those boots are supposed to be quite supple, so it's probably time you replaced them anyways.

Also, how are your insulators?  The parts going from your carbs to the engine.  They often crack and have leaks if they're old, although that causes a high idle, not usually a lean condition.

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