JNMotors Bikes - motorized bicycle parts and accessories Help

Technical Training

Total Motorized Tech Training

This page is dedicated to walking a New Motorized Bicycle Owner through everything they need
to know about dealing with their new engine. We understand learning about new things can be
time consuming and want to do our part to help keep this learning curve fast for you.

  • Walbro Carburetors
  • Troubleshooting
      If you're having trouble with the engine running on your motorized bicycle...
      the problem(s) that you're having fall into the following 4 categories:
    • 1) Fuel System:

        When you're looking for the problem in the fuel system. Keep in mind that it's a system that has a beginning and an end. The beginning of this system starts with the Fuel Tank and ends inside the carburetor where it sprays out the fuel to be mixed with the air. Start at the beginning of this sytem and just follow the fuel down it's path until it's resolved.

        Is there gas inside the gas tank?
        Is the gas getting through the first fuel filter? (the petcock fuel filter)
          - It's usually best to take this filter out of the petcock and throw it away.
        Is the gas getting through petcock? Is the petcock lever in the ON position?
        Is the gas getting through the second fuel filter?
        Is the gas getting to the carburetor?
        Is the gas getting through the carb jets?

      • A) Checking Fuel Hose Clogs:



      • C) Checking Pop-Off Pressure:



    • 2) Ignition System:

        Soon 2 B Written

    • 3) Vacuum Leaks:

        Before insertion of the bolts through the carb be sure to add Lock Washers and maybe apply some Thread Locker so they don't vibrate loose. Only apply Thread Locker if the Lock Washers don't keep the bolts tight. Often times Thread Locker will get in between the gasket material and cause a Vacuum Leak here between the carb and the intake.

        If you have some dried on Thread Locker on the surface of the gasket, carb or intake and are having a hard time getting it off of there, try sand paper and if you want to make sure the surface is completely flat you can tape some sand paper to a piece of glass before rubbing the pieces against the sand paper. This is the best way to ensure you don't get a Vacuum Leak here.

        You can check for Vacuum Leaks by spraying some carb cleaner on the gasket while the engine is running. If the engine idle slows down or if the engine stops running completely when you spray the carb cleaner on the carb gasket then you know you have a Vacuum Leak there.



    • 4) Compression Leaks:



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