Question about CM400 Custom Carb screw
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Thread: Question about CM400 Custom Carb screw

  1. #1
    Junior Member BSmith4570's Avatar
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    Question about CM400 Custom Carb screw

    Hi Guys,

    Really appreciate any help i can get identifying what this screw does on my brother's CM400 Custom VB22 carb.

    He's got a small leak I'm troubleshooting as I'm learning and not sure what function, if any, these screws with fins have on the operation of the carb. I know they're not the mixture screws, but what are they? Are they just for bolting the bowl and finning some heat?

    Any insight is appreciated.

    Question about CM400 Custom Carb screw-carb1.jpg
    Last edited by BSmith4570; 10-22-2019 at 09:40 PM.

  2. #2
    Sensei 66Sprint's Avatar
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    Ah, but they ARE....Those would be the fuel/air mixture adjustment screws with limiter caps intact........
    "I have a mind like a steel trap.....Old and rusty, of antiquated design, and hard to get stuff back out of...."
    Contact info: E-mail; [email protected] Phone; 540-525-5199

  3. #3
    Junior Member BSmith4570's Avatar
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    Quote Originally Posted by 66Sprint View Post
    Ah, but they ARE....Those would be the fuel/air mixture adjustment screws with limiter caps intact........
    Oh. I thought they were back towards the air box, rather than upfront towards the engine. Thanks for the insight.

    I will read-up on the proper method for setting the mixtures. Much appreciated.

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  5. #4
    Super Moderator longdistancerider's Avatar
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    Someone did you a favor and cut the limit tab off the float bowl so you can adjust more than 7/8 of a turn
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
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  6. #5
    Junior Member BSmith4570's Avatar
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    Quote Originally Posted by longdistancerider View Post
    Someone did you a favor and cut the limit tab off the float bowl so you can adjust more than 7/8 of a turn
    I guess that's why they were so easy to dial-in, lol. Followed the manual instructions and had the CM idling at around 1200 and purring like an angry kitten

    Thanks guys. Going to do an oil change and lube this weekend.
    longdistancerider likes this.

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