49cc HS engine keeps stalling

Discussion in '4 Stroke Bicycle Engines & Kits' started by outlawbiker, Jul 25, 2016.

  1. outlawbiker

    outlawbiker Member

    Joined:
    Mar 15, 2009
    Messages:
    282
    Likes Received:
    0
    I got another one of those 7g ghost racer kits from gasbike, choke lever was broke and trans cover was cracked, sent off for the parts to fix it, installed it into a kent del rio and from the start it seemed like it was starving for fuel or air.But it would run and wouldnt stall out so, no big deal i thought for the first couple of weeks and it seemed to go away.

    The day i get a buyer to pick it up,it wont stay running unless its choked, as soon as flip the choke off it dies and i cant get it running again unless i choke it. Fine, im thinking vacuum leak right?

    Today I pull the carb off and put gas resistant RTV on all the gaskets thinking that will solve the vacuum leak...... nope. I check the fuel from the tank to the carb and its free and clear.

    If i am able to keep it running with the choke off as soon as i give it some gas it dies, same thing with the choke on. the only thing i didnt do was check the float,but i thought if the float was stuck open gas would pour out of the overflow tube and thats not happening so i ruled it out. Maybe im wrong, but before i get anymore pissed about this I thought id throw it out there to you guys.

    Any ideas whats going on?
     
  2. Tony01

    Tony01 Well-Known Member

    Joined:
    Nov 28, 2012
    Messages:
    1,134
    Likes Received:
    191
    what's the plug look like?
     
  3. nsanecopilot

    nsanecopilot New Member

    Joined:
    Sep 28, 2014
    Messages:
    38
    Likes Received:
    0
    Rough handling during shipping may have caused carb float to be off calibration
     
  4. outlawbiker

    outlawbiker Member

    Joined:
    Mar 15, 2009
    Messages:
    282
    Likes Received:
    0
    plug is black,pulled the plug out cleaned it up and tried tweaking the mixture screw under the brass plug, no luck.still stalling and fouling out the plug.

    I ordered a new carb just incase,I know i could break down the old one and try to clean it, but i wanted a back up. Its been too hot today to tear into it.

    Just want to get this bike done and get rid of it, its been bad luck from day one.
     
  5. maniac57

    maniac57 Old, Fat, and still faster than you

    Joined:
    Oct 8, 2011
    Messages:
    4,484
    Likes Received:
    16
    The carbs on these motors are famous for this problem.
    Best fix is swap for NT carb/manifold or better quality Walbro pumper carb
     
  6. outlawbiker

    outlawbiker Member

    Joined:
    Mar 15, 2009
    Messages:
    282
    Likes Received:
    0
    new carb fixed the problem,sort of. I cant get it to stay running at idle without the clutch trying to grab. Im not worried, I just want to get this bike out of my garage and get working on other stuff.
     
  7. Jcs1989

    Jcs1989 New Member

    Joined:
    Jul 31, 2016
    Messages:
    37
    Likes Received:
    0
    Check an make sure your fuel line is tight on the carb an the petcock from the tank. I have mine zip tied so there is chance of air getting in. Hope this helps..
     
  8. outlawbiker

    outlawbiker Member

    Joined:
    Mar 15, 2009
    Messages:
    282
    Likes Received:
    0
    This got me thinking of a carb swap on another bike, How would you go about getting one of those Walbro's to work on a HS 4 stroke? Thought they needed some kind of back pressure to get the pump in em to work. Forgive my ignorance,but ive never worked with one of those Walbro's before, only know of them by skimming these forums for ideas and learning a few new things.
     
  9. BikeSmith

    BikeSmith New Member

    Joined:
    Nov 28, 2015
    Messages:
    15
    Likes Received:
    0
    You may have the same problem I just faced. a bad fuel cap. Mine was not venting, it would start on the choke and die just like yours. try taking the fuel cap off and start it. worked for mine, so I just blew out the vent hole with some compressed air and good as new.
     

Share This Page