Issues with dropping out

Discussion in '4-Stroke Engines' started by Allik11, Sep 18, 2015.

  1. Allik11

    Allik11 New Member

    Hi there,
    I have a 49cc, 4-stroke engine bike and I'm having really bad issues with it dropping out. I've had a very good mechanic look it over and mechanically, he's done everything he can to prevent that but I'm still having issues with it. I do let it warm up (about 3-5 minutes) but I still have issue and interestingly, they're towards the end of my ~1 mile ride. I'll come to a stop sign and when I let off the throttle, the engine dies. Warming it up a bit longer does help but I wonder if anyone has any suggestions on what I can go other than wait 10 minutes for it to warm up before I ride it?

  2. msiert

    msiert Member

    Mine did the same thing but after drilling out the bras plug that exposes the fuel mixture screw, I found I was running pretty lean. The best setting I found for that screw was close to 2 full turns out from fully seated. You can also try to adjust the idle screw (the black screw on top of the carburetor) so the engine idles faster. I found that the idle varies depending on the outside temp, I have mine set to idle between 2,400 to 2,600 rpm's.