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  1. #21 Re: 250rtc engine/carb problem 
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    Alright guys I have done what you have told me to do today, here is my exact recap of what happenned and what I did today with the bike.

    originial problematic state, at 10:00 got on bike and rode around for 30 minutes to an hour going through all gears all speeds. The bike rode fine and had no problems at all while riding, yet when starting it up it did have the usual get up to temp. delay.

    I then let the bike site for 2 hours

    after 2 hours I ride the bike to the gym. on the way to the gym about 5 minutes in the bike starts backfiring and chugging and as soon as let go of throttle it turns off. I pull over.

    I then open the gas cap completely and try turning over the bike with no choke and everything at original state, it does not start. I close it.

    I then try tunring on the bike with carb float bowl draine screw fully out and gas leaks out of hose fast. I screw the screw back in to how it was.

    Bike still wont start.


    At this point I just get fed up and turn the idle screw so that the idle revs starts at 2000, a little high. the bike then starts but it takes a good 10 seconds and giving half throttlle to get it started.

    Riding 20 minutes to the gym it rides perfectly fine.

    Let the bike sit for 1 hour, ride back home 30 minutes and it rode perfectly.

    This was what I have done today with the bike
    2011 250rtc
    2004 m3 e46
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  2. #22 Re: 250rtc engine/carb problem 
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    This starts to seem like a mixture issue.

    Btw. have you checked air filter for leaks?
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  3. #23 Re: 250rtc engine/carb problem 
    Senior C-Moto Guru barnone's Avatar
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    mattbujor,
    You wrote "I then open the gas cap completely and try turning over the bike with no choke and everything at original state, it does not start. I close it.

    I then try tunring on the bike with carb float bowl draine screw fully out and gas leaks out of hose fast. I screw the screw back in to how it was."

    This is not what I asked you to do. Next time the engine dies do not open the gas cap, do not try to start the engine(turn on), just open the drain screw and see if gas runs out. This will determine if you have fuel in the float bowl when the engine stops running.

    You might have an electrical problem that is intermittent.
    Go to a Harbor Freight store and get one of these spark testers.



    http://www.harborfreight.com/90-inli...cker-4445.html
    Next time your engine dies, hook up the spark tester and see if you are getting spark when you try to restart the engine.
    Vince
    2021 Ural cT
    2022 Dong Fang DF250RTG
    2021 Ice Bear 150cc scooter
    2020 Ice Bear 150cc Scooter
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  4. #24 Re: 250rtc engine/carb problem 
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    Quote Originally Posted by Krasi View Post
    This starts to seem like a mixture issue.

    Btw. have you checked air filter for leaks?
    yea I sprayed it with wd-40 and check for air leaks around, found nothing
    2011 250rtc
    2004 m3 e46
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  5. #25 Re: 250rtc engine/carb problem 
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    Quote Originally Posted by barnone View Post
    mattbujor,
    You wrote "I then open the gas cap completely and try turning over the bike with no choke and everything at original state, it does not start. I close it.

    I then try tunring on the bike with carb float bowl draine screw fully out and gas leaks out of hose fast. I screw the screw back in to how it was."

    This is not what I asked you to do. Next time the engine dies do not open the gas cap, do not try to start the engine(turn on), just open the drain screw and see if gas runs out. This will determine if you have fuel in the float bowl when the engine stops running.

    You might have an electrical problem that is intermittent.
    Go to a Harbor Freight store and get one of these spark testers.



    http://www.harborfreight.com/90-inli...cker-4445.html
    Next time your engine dies, hook up the spark tester and see if you are getting spark when you try to restart the engine.
    while off, when I had the problem gas leaked out with the gas cap open completely and closed completely
    2011 250rtc
    2004 m3 e46
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  6. #26 Re: 250rtc engine/carb problem 
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    barnone, today I ran it again but it had very different results. And this time when it did stop, first thing I did was open drain screw and gas did come out. So this adds a twist to all of this I guess.
    Today I did exactly what I did the other day except I ran it at a higher idle, 1800 cold 1900 hot so it actually stayd in a consistent range than what it was before, cold 1400 hot 1800.

    So I ran it for an hour it ran good. Parked it for one hour and then got back on and within 5 minutes it stopped again. I checked the drain screw and and gas cap again, all was good. I then started it but this time it actually had no problem starting up as compared to before. And then I continued to ride it for 30 minuted going full throttle and going through every gear and it ran perfectly.

    What in the world?
    2011 250rtc
    2004 m3 e46
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  7. #27 Re: 250rtc engine/carb problem 
    Senior C-Moto Guru barnone's Avatar
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    Weird problem. Seems to not be a problem getting fuel in the float bowl.
    Starting to sound like an intermittent electrical problem.
    Get one of those spark testers.
    Vince
    2021 Ural cT
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    2020 Ice Bear 150cc Scooter
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  8. #28 Re: 250rtc engine/carb problem 
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    Quote Originally Posted by barnone View Post
    Weird problem. Seems to not be a problem getting fuel in the float bowl.
    Starting to sound like an intermittent electrical problem.
    Get one of those spark testers.
    I have been told by a mechanic that checked it out that it was a bad coil, however I dont want to get just another similar chinese made coil, I am now looking for other bike coils that might fit that might perform better. I just dont understand if it is electrical or bad coil, how in the world would it have allowed me to start up the bike again so quick and ride it for another 30 minutes going pretty hard on the bike?
    2011 250rtc
    2004 m3 e46
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  9. #29 Re: 250rtc engine/carb problem 
    Senior C-Moto Guru barnone's Avatar
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    Could be the coil breaking down at certain temperatures. I've had that problem before on a Honda VT500FT. Trying a new coil and a new NGK spark plug would be fairly inexpensive. Hope it's not the CDI.
    Don't expect any performance improvement from a more expensive coil.
    Vince
    2021 Ural cT
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    2021 Ice Bear 150cc scooter
    2020 Ice Bear 150cc Scooter
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  10. #30 Re: 250rtc engine/carb problem 
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    Quote Originally Posted by barnone View Post
    Could be the coil breaking down at certain temperatures. I've had that problem before on a Honda VT500FT. Trying a new coil and a new NGK spark plug would be fairly inexpensive. Hope it's not the CDI.
    Don't expect any performance improvement from a more expensive coil.
    Im not, just hoping for more reliability. Yea getting an iridium sparkplug with some "performance" spark wires and a new coil is going to be cheap, easy, and might fix the problem. I have been wanting to take it to a mechanic to see if he could just diagnose the problem and then I would fix it but here in miami none of the shops seem to have good ratings and the mechanics seemed as lost as the mechanics at scoterdepot.
    2011 250rtc
    2004 m3 e46
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