Replacement 22mm carb recommendations for Honda Single?
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Replacement 22mm carb recommendations for Honda Single?

This is a discussion on Replacement 22mm carb recommendations for Honda Single? within the General forums, part of the Caferacer.net Forums category; The original Keihin carb on my '74 CL125S is just driving me crazy. I've disassembled it, soaked it in Chem-Dip, fiddled, fussed and futzed with ...

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Thread: Replacement 22mm carb recommendations for Honda Single?

  1. #1
    Senior Member Tanshanomi's Avatar
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    Replacement 22mm carb recommendations for Honda Single?

    The original Keihin carb on my '74 CL125S is just driving me crazy. I've disassembled it, soaked it in Chem-Dip, fiddled, fussed and futzed with it. It runs great one moment, then rev it up and the idle will suddenly be 1000 RPM higher or lower a moment later. It can run great out on the street for 10-20 minutes and then die suddenly at speed and be unwilling to restart.

    I am more than willing to get another carb, but I don't want to complicate things further by getting one of those Chinese knockoff pit-bike carbs on Ebay, with their pot-metal bodies and mystery-meat jetting. I was ready to get an OKO K-101 from Mid-Atlantic Trials, but that's only made with left-side adjustment screws and choke, which would be really problematic on my bike.

    Any suggestions about where I might source a decent-quality 22mm carb suitable for a 15HP, four-stroke single?

  2. #2
    Senior Member Cyorg's Avatar
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    Any chance there is a partial blockage upstream? When it craps out, shut the fuel off right away and see what is in the float bowl? Had one that was a pain. Piece of O ring trapped up out of sight under the seat for the float needle.
    Last edited by Cyorg; 02-19-2018 at 02:51 PM.
    "Non urinat in ventum"

  3. #3
    Senior Member steveo's Avatar
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    There's a few 22mm Dellorto carbs on this site. Just a thought, could the problem be electrical/ignition?
    https://www.dellorto.co.uk/shop/dell...22as-4-stroke/
    Last edited by steveo; 02-20-2018 at 02:48 AM.
    "It's better to keep your mouth shut and appear stupid than to open it and remove all doubt"

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    Senior Member XB33BSA's Avatar
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    i have available a 24mm oem sl350k1 carb.it.s clean and ready to use
    one good thing about the old oem carbs is thety were not hampered by any epa regulations
    carb needs to be same or within less than a mm at spigot

  6. #5
    Senior Member XB33BSA's Avatar
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    but those running issues you are having are not carb related ,i would wager on it

  7. #6
    Senior Member Tanshanomi's Avatar
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    I'm thinking a $1000 antique makes great sense for this application. It's 22mm, what could go wrong?

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    Dell´Orto SSI 22,5C, for Guzzi, Ducati,Motobi Motociclo 175, carb SS1


  8. #7
    Senior Member Tanshanomi's Avatar
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    Quote Originally Posted by steveo View Post
    There's a few 22mm Dellorto carbs on this site. Just a thought, could the problem be electrical/ignition?
    https://www.dellorto.co.uk/shop/dell...22as-4-stroke/
    The problem is still having the choke and adjusters on the left side — problematic in this installation.

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  9. #8
    Senior Member Tanshanomi's Avatar
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    It's possible that ignition is somehow involved, but I've replaced the points, condenser, and coil already. Also, I can't imagine how the fluctuating idle is electrical. I've messed with it enough that my next logical troubleshooting step is a known good carb.

  10. #9
    Senior Member steveo's Avatar
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    Quote Originally Posted by Tanshanomi View Post
    The problem is still having the choke and adjusters on the left side — problematic in this installation.

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    See what you mean.
    "It's better to keep your mouth shut and appear stupid than to open it and remove all doubt"

  11. #10
    Senior Member Tanshanomi's Avatar
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    Just to close the loop on this thread, I ended up getting a 24mm carb and a rubber flange, then making up an adapter.

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