Home Forums 2-Cycle Racing Problems starting yamaha kt100

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    • #49553
      Omar Calixtro
      Participant

      I have a yamaha kt100 and I have recently installed a clutch on it. The thing is the kart started just fine on direct drive and now it won’t start with a clutch. It does pump fuel. Also if I choke the wb3a carb the engine starts then turns off. If I don’t choke it the engine doesn’t turn on at all. Am I doing something wrong? It would really help if someone gave me the steps on how to turn on a kart with a clutch.

    • #49555
      Peter Zambos
      Participant

      It’s really simple. Engage starter shaft. Activate starter. Blip throttle. Disengage starter. You might have to choke the intake for a second if you just put a fresh carb on it.
      If you have to do anything else, then something else is wrong. Does the clutch and axle spin easily while the kart is on the stand?

      • #49557
        Omar Calixtro
        Participant

        The clutch and the axle spin just fine.

    • #49558
      TJ Koyen
      Moderator

      So it starts when you choke it? Do you then keep giving it throttle to keep it running and it still dies?

      Driver/Coach/Wrench : Innovative Performance/Exprit
      Owner : Oktane Visual - www.oktanevisual.com
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      • #49559
        Omar Calixtro
        Participant

        I haven’t tried going full throttle. I say I go about medium throttle. Should I give full throttle or very little throttle?

    • #49575
      tony zambos
      Participant

      Omar,
      Was anything else done to the motor besides installing the clutch?
      How did you hold the crankshaft stationary while tightening the starter nut on the clutch?

      LAD Specialties customer / tony kart / rotax / kt100

      • #49576
        Omar Calixtro
        Participant

        Tony, nothing else was done besides installing the clutch. I could check the carb. But I doubt thats the problem because if I choke the engine fuel does pump.

        • #49619
          Omar Calixtro
          Participant

          Also I am using the inbuilt fuel pump on the walbro wb3a.

    • #49609
      Walt Gifford
      Participant

      Clean the fuel screen and put in a new pumper. Also could be a fouled plug from running rich on the stand.

      FAA certified jet engine and aircraft technician,
      Nicholson Speedway class champion 2001,
      Yamaha KT100 Service Center,
      41 years karting experience

    • #49617
      Omar Calixtro
      Participant

      I also noticed just now when I tried to start it again that the fuel had trouble getting up to where the fuel going in the carb. The fuel had problems going up once I stopped choking the engine

       

    • #49624
      Patrick Haney
      Participant

      I had the exact same problem. When I cloaked the engine, the fuel would reach the carb. As soon as I took my hand off the intake, the engine would stall.  Problem? Fuel tank vent was clogged.

      • #49635
        Omar Calixtro
        Participant

        Thank you patrick I will take a look at the fuel tank vent later.

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