Question about 1979 Honda CBX

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I have rebuilt the carb on my 65honda ct90 and

I have rebuilt the carb on my 65honda ct90. I have experiance in rebuilding them but have'nt mastered adjusting it so it is perfect. It idles ok and revs ok but is running rich. little black smoke and black plug. can you help me adjust it/

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  • yadayada
    yadayada May 11, 2010

    u did something wrong, no adjustment will cure this problem.



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The stock setting for the throttle screw and air screw is one and one half turns outward from a LIGHTLY seated position. Go to babbitts sports and you may be able to see a parts diagram for your bike and get some parts as well. Click on buy OEM parts. Your bike is really old so I can't guarantee it will be listed. I am not at my home computer so I can not check for you at the moment. Check to see what main jet is stock in the bike. Someone may have played with the jets.

Posted on Oct 07, 2009


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Carb is in need or a cleaning and rebuild. I would suspect the diaphragm is bad. You can get a rebuild kit with all the gaskets for most carbs for around $10. There are some that gaskets are not available for and you would need to replace the entire carb. Carbs run from $15 to $30.

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84 f150 carburetor out of tune

When you get a rebuilt carb you have no idea what the
applications are for

I suggest you rebuild your own,
that way you have all the settings
& experience when your done

I think the float needs to be set correctly
& maybe the pump if there is anything for that

You have to have some knowledge about basic
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Start about one turn out from seated & then use a
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I would have all 3 on motor at once

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Good Luck

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Thank you for your visit today. I hope you find this information helpful.

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