Re: 79 cb750 rattle at low rpms

Posted by seestheday on Aug 02, 2012; 12:19am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/79-cb750-rattle-at-low-rpms-tp4026044p4026294.html

Hmmm... Not sure why your plugs are reading like that, but I'm 99% sure that out = richer. There is a good explanation on what is going on here: http://www.mailinglistarchive.com/[hidden email]/msg21143.html

Sent from my BlackBerry device on the Rogers Wireless Network

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From: "DreamCrusher [via Honda CB750'S]" <[hidden email]>

Date: Wed, 1 Aug 2012 14:22:44 -0700 (PDT)

To: seestheday<[hidden email]>

Subject: Re: 79 cb750 rattle at low rpms

I didnt say that, the other guy made a comment and said: try to shoot for your plugs to be like # 2. However, I rotated the pilot screws out from 1 1/2 to 2 1/2 and the plugs cleaned and up and do not have as much black build up on them. So wouldnt that show the carbs running leaner, with less fuel? I thought if it got richer, it would cause more black build up showing the cylinders to be loading up. Or do Iunderstand it incorrectly. More fuel= black build up on plugs=richer mixer.... Less fuel=lighter colored/non build upplugs= learner mixer.  YES???

 

If above is true, then turning the pilot screws out made the engine run more lean/no build up.

 

Please educate me if I am wrong.

 

Thanks!

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From: "seestheday [via Honda CB750'S]" <[hidden email]>
To: "DreamCrusher" <[hidden email]>
Sent: Wednesday, August 1, 2012 3:40:19 PM
Subject: Re: 79 cb750 rattle at low rpms

Yep, out = richer on the DOHC's (79 and above - I have an 81).

What do you mean by aiming for the plugs to be about #2?

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