CL90 carburetor

Discussion in 'CT90, CT110, ST70, ST90 Discussion' started by MLW9110, May 19, 2019.

  1. MLW9110

    MLW9110 New Member

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    Hi. New to the forum. I have a 1968 Honda CL90 that had been sitting for about 12 years. It's in good shape overall but would not run. Points smoked when start attempted. I replaced points, condensor, spark plug and coil (aftermarket). Installed solid state regulator/rectifier.
    Found stator grounded to frame. Replaced stator.
    Engine started and idled well but had poor acceleration. Missing, sputtering, power in bursts.
    Cleaned carb and installed rebuild kit. No help.

    I want to install a new aftermarket carb. I'm finding that carbs advertised as fitting tle Cl90 don't fit. The carb on the bike has a slanted flange mount and holes are 44mm center to center. Replacement carbs don't have the slanted flange and holes are 48mm.

    My carb has L90A stamped on the flange. Keihin. 20190518_214116.jpg 20190518_214100.jpg

    Anyone know of a carb I can put on this bike? Thanks, Mike
    Bremerton, WA
     
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  3. b52bombardier1

    b52bombardier1 Well-Known Member

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    It looks a lot like the carb on my 72 CL100. You might also check the spark advance mechanism to see that it moves and retracts freely.

    Rick
     
  4. MLW9110

    MLW9110 New Member

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    Thanks Rick.
    I checked that yesterday. Advance mechanism was not rusted or sticking. I cleaned it and relubed.
    I'm taking the carb off again to take another look
    Been playing with timing too.
     
  5. b52bombardier1

    b52bombardier1 Well-Known Member

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    Check the tiny holes in the cylindrical emulsion tube above the main jet and below the slide needle. Those holes along the side need to all be clean for proper atomization of fuel.

    Rick
     
  6. red69

    red69 Well-Known Member

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  7. MLW9110

    MLW9110 New Member

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    Thanks. Looks right. Can you measure the distance center to center of the mounting studs? Should be 44mm.
    Takes a long time to get part from Thailand.
     
  8. MLW9110

    MLW9110 New Member

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    Unfortunately I over tightened the tube on my carb and deformed the holes. I have an aftermarket tube in. Might be part of my problem.
     
  9. red69

    red69 Well-Known Member

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    As I said, it's 45 mm on center at the mounting point. That should not be a problem for you. Push comes to shove, a tiny amount of reaming will take care of any difference.I

    Bob
     
  10. MLW9110

    MLW9110 New Member

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    Thanks Bob. Missed the 45mm in your post. I found one in the US and am waiting to hear from the seller to verify it will fit.
     

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