hard starting huasheng 49cc

Discussion in 'Motorized Bicycle Trouble Shooting' started by familyguy, Mar 24, 2012.

  1. familyguy

    familyguy New Member

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    bout 500 miles on the motor, started to start sluggish (wont start with choke). like symptoms of a dirty carb, so cleaned the carb real good, did find some debree in carb, blew out orifices. put back together, same issue. i have to pull with choke on ( wont fire), flip choke off & pull start giving gas and it stumbles to a start, after it warms up, it runs/ idles great....SO... i put in a new plug, a new magneto, fresh gas, and even changed out the old carb with a brand new one, still wont start in choke. i have even tuned the old & new carb starting at 2 turns out on the air screw(brass) and gone up to 3 turns. normally between 2 and 3 turns out works great for me. i can start it through the method i told above. and can ride it all day once i get it going, it runs well.lots of power! could the valves be causing this? pretty much the only thing i havent done.
    your input is greatly appreciated.
    thanks
     
  2. familyguy

    familyguy New Member

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    it used to start first pull, or even half a pull sometimes
     
  3. Fugi93

    Fugi93 New Member

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    Does it try to start on full choke on the first pull or two? I know my 49er doesn't like full choke in warm weather. It'll start but dies immediately before I can get the choke lever back off.
     
  4. Bikeguy Joe

    Bikeguy Joe Godfather of Motorized Bicycles

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    Could be an intake leak, or valve not seating fully (for several reasons).
     
  5. familyguy

    familyguy New Member

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    well the new carb came with new gaskets and its sealed tight so i think im gonna start lookin at the valves...to adjust valves, does the piston have to be in certain position?
     
  6. familyguy

    familyguy New Member

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    no it doesnt even try to start, i could yank it 10 times and nothing, so i flip the choke back off, and it will try to start but will need throttle to resess-i-tate.
     
  7. The_Aleman

    The_Aleman New Member

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    Definitely do a valve adjustment. It'll help overall - starting, idling, cruising.
    Before you adjust it properly, try to find out how far off they are already!

    Oh, and don't worry about air leaks. They are extremely unlikely, considering the intake is a ~3/8" piece of plastic with a gasket on both sides.
     

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