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Thread: carb diagnostics

  1. #1
    Senior Member SportsterDoc's Avatar
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    carb diagnostics

    Some TW riders may benefit from a couple websites for H-D Keihin CV40 carbs, which are VERY similar to the Teikei TK28 CV carbs.
    Both have vacuum operated slides and both have an enrichener circuit, rather than choking the air supply.

    Nightrider came to my attention circa 2002. Lots of useful info, although there are a few tricks overlooked, such as putting the slide/diaphragm in a freezer for a few minutes before re-assembly.

    Carburetor Troubleshooting Guide

    It has a lot of good info, although I do NOT subscribe to their suggestion of drilling the slide.

    http://www.nightrider.com/biketech/hd_cv_mods.htm

    My reasons for not drilling are the same as given by CVPerformance (see item 6 in their link). They recommend not drilling over 7/64", but I would not molest the slide, at all.

    https://cv-performance.com/harley-cv...-tuning-issues

    CVPerformance became a sponsor of the XLForum and may have gleaned some of their collective info from that forum.
    Last edited by SportsterDoc; 01-12-2019 at 11:43 PM.
    2014 Honda CB1100
    2018 Yamaha XT250
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    2017 Yamaha TW200
    2012 Triumph Bonneville
    2002 H-D Sportster 1200 Sport
    2003 H-D Sportster 883
    1976 Honda CB750F
    1975 Honda CB360
    1970 Yamaha CT1
    1972 Yamaha CT2
    1972 Yamaha AT2/CT2
    1970 Honda SL350
    1970 Honda CL350
    1967 Honda CL160
    1967 Honda CB160
    1962 Honda CA110

  2. #2
    Senior Member Smitty Blackstone's Avatar
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    NEVER drill the slide.
    Darth and Peterb like this.

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