Brand New kit bogs out on throttle?

Discussion in 'Instructions for Building and Repairing Motorized ' started by Tom Jones, Jan 11, 2019.

  1. Tom Jones

    Tom Jones New Member

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    I had a brand new kit installed and tested professionally, to break it in I rode it home, about 30 miles, giving it breaks in between every 5 miles or so to keep as little stress as possible on It, around mile 20 after I crossed an intersection and went to start up it started fine but the second I hit the gas it just shut off. I know how to do a lot of trouble shooting so here is what I did
    TS1- Turn off fuel line, TAPPED prime button fuel game out of air filter indicating flooding, ran motor with fuel off till carb was empty, turned fuel on TAPPED prime but twice started it up let it idle about 3 minutes. Still died on throttle.

    TS2-Repeated TS1 as it flooded again but kept off fuel, Removed carb, brand new so it was spotless, no leaks, breaks, bends, or scratches inside, I adjusted the throttle needle up to allow more air less fuel and I put on a smaller fuel line.
    This had more success but it still dies on throttle HOWEVER if I raise the choke 3/4 the way up and SLOWELY give it throttle I can and as soon as the throttle is full I can then slowly bring the choke down to achieve full speed! This will actually stay like that UNTIL I slow down then I have to adjust the chokea gain and start the process over!

    I am going to check the sparkplug, some sort of "Jet" in the carb I guesse a grain of sand could clog and I'm going to get a good premade fuel mixture if those 3 things dont work I'm at a loss the kit is brand new and like I said professionally installed, he has a warranty on it but he's 30 miles away and I dont own a vehicle.
     
  2. allen standley

    allen standley Active Member

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    Before you do anything else. Be certain your fuel tank Cap is venting properly. If the fuel cap on the tank is not venting properly, the engine could be fuel starved. With fuel in the tank and the cap on tight, remove the fuel line from the carburator and stick the end of it into a fuel can, turn the valve on to see if you have a steady, uninterrupted flow of fuel. Give it a couple minutes. If fuel supply seems fine the Cap is venting properly. If the flow slowly turns into a trickle then drips to a stop - remove the cap to see if a good flow is restored. THE FIX is to drill a small hole 1/16 or less in the center of your cap.
     
    #2 allen standley, Jan 11, 2019
    Last edited: Jan 11, 2019
    Tom from Rubicon likes this.
  3. Tom from Rubicon

    Tom from Rubicon Well-Known Member

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    The vent is something you don't think about. I had a Tecumseh engine'd mower that stopped running. Donated it to a High School shop class. Gas cap venting was the culprit.
    Tom from Rubicon
     
  4. Greg58

    Greg58 Well-Known Member

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    Welcome to the forum, if you have to close the choke to get it to accelerate you have a air leak somewhere. Closing the choke reduces the amount of air to compensate for the leak. I would start with that. From what I understand you have fuel in the carb because it came out of the air filter. As far as fuel goes a mix of good 2 cycles oil for air cooled engines at 24/1 is good for break in.
     
    #4 Greg58, Jan 11, 2019
    Last edited: Jan 11, 2019
  5. allen standley

    allen standley Active Member

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    OP doesn't state high rev out of control idle. or a surge in idle- a sure indication of air leak. Could be tho Greg.
     
  6. Greg58

    Greg58 Well-Known Member

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    Too much air was all I could think of, if he has fuel flow as said. Maybe he has debris in the main jet or something restricting fuel from entering the air that is drawn into the carb.
     

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