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  1. #1
    CB750 Member kar1zma's Avatar
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    help evaluating carb rebuild kits

    thanks to the support of AMC we purchased
    the CB750F body kit

    and now on to the next step
    Carb rebuild and engine gas kit

    so i have found several carb rebuild kits

    the most expensive is the RANDAKK

    https://www.randakks.com/honda-dohc-...version-b.html



    several cheaper ones

    https://carpyscaferacers.com/shop/sh...b-rebuild-kit/

    https://www.dimecitycycles.com/79-ho...build-kit.html

    http://www.vintagecb750.com/products/6/fuel-system

    http://www.nichecycle.com/ncs/catego...it-by-ncs.html

    http://4into1.com/carburetor-rebuild...50l-1979-1982/

    we would like to do it right the first time
    please letme know what you guys prefer

    ofcourse $$$s saved is always a good thing but we cant compromise on quality

    thanks

  2. #2
    Moderator dirtdigger's Avatar
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    You will have to look more closely at each of the sites kits. The randakks kit is all 4 kits as well as accel pump and 4 air cut off diphrams. Several of the others that you have linked go directly to sohc carb kits will not work, the other cheap kits do not include air cuts, or accel pump and are also individual kits. You will have to determine what items are bad in your carbs...if your air cuts are good or you are going to eliminate them then you dont need to spend the money on the expensive kit that includes them because the air cut diaphrams are an expensive part of the kit, if you are going to do just a clean of the carbs then all you need are the soft rubber orings and gaskets and could just get by with the cheap kits. Kinda all going to depend on what you need to do with the carbs.

  3. #3
    CB750 Guru amc49's Avatar
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    X2 all of that. I personally dump the air cuts on mine. Extra money for nothing there. Buy good needles and seats, it is a problem now with cheap crap Chinese parts that vary from spec.

    The skills of the person doing the work figure in as much on the end result as the best of parts.

  4. #4
    CB750 Enthusiast Chuck Hahn's Avatar
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    AMC49... saw this and you say you eliminate the air cutoffs. Do you think if I removed them from this 750 i have been having all the troubles with it would help any? they were new K/L ones that I put in but if they dont really have an effect on its running then why did Honda even have them to begin with??? Whats their purpose in other words???

  5. #5
    CB750 Member kar1zma's Avatar
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    ,@ dirtdigger

    If the randakk kit is a high quality product I don't mind buying it.
    I'd rather have peace of mind than some $$$ saved and a whole lot of headache

    @ AMC

    Why would we want to remove the aircuts valve all together
    My puprpose of this build is for smooth and stock running bike and definitely for reliability

    Sent from my ONEPLUS A3003 using Tapatalk

  6. #6
    CB750 New Member Norton's Avatar
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    Randakks is well known through GL owners for the quality of these carburetor kits. These kits are well appreciated on the race circuits also. All the rubber items that are offered are from "Viton" material. If you have a chance visit the website and follow the reviews that goes along with the integrity and admiration that is expressed. When it comes to rebuilding a bank of four carburetors you only want to do it one time. The tech support that goes along with the Randakk's kit is unsurpassed. One kit for (4) carbs to convenient.

  7. #7
    CB750 Member kar1zma's Avatar
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    Quote Originally Posted by Norton View Post
    Randakks is well known through GL owners for the quality of these carburetor kits. These kits are well appreciated on the race circuits also. All the rubber items that are offered are from "Viton" material. If you have a chance visit the website and follow the reviews that goes along with the integrity and admiration that is expressed. When it comes to rebuilding a bank of four carburetors you only want to do it one time. The tech support that goes along with the Randakk's kit is unsurpassed. One kit for (4) carbs to convenient.
    Well that's it then . I am buying the randakk kit
    Where could I find a detailed manual for the process if available.

  8. #8
    CB750 Guru amc49's Avatar
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    http://www.cb750c.com/publicdocs/Sea...anual_revG.pdf

    To other.........the aircuts stop backfiring in the exhaust pipes at decel due to very lean idle fuel settings. They cease to be needed once the idle screws get adjusted richer (adjusted a higher numbers of turns open) past any limiter cap limits. Messed up and leaking they become a vacuum leak and affect idle quality the most.

  9. #9
    CB750 Member kar1zma's Avatar
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    Quote Originally Posted by amc49 View Post
    http://www.cb750c.com/publicdocs/Sea...anual_revG.pdf

    To other.........the aircuts stop backfiring in the exhaust pipes at decel due to very lean idle fuel settings. They cease to be needed once the idle screws get adjusted richer (adjusted a higher numbers of turns open) past any limiter cap limits. Messed up and leaking they become a vacuum leak and affect idle quality the most.

    thank you for the manual very helpful!!!
    i will buy the entire kit my for now and go ahead

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