Motorised bike running slow

Discussion in '2-Stroke Engines' started by Fender8008, May 17, 2015.

  1. Fender8008

    Fender8008 New Member

    Hi my names Fender and I have had my motorised bike for about 6 months and absolutely love it and use it Togo everywhere but recently it started running slow it would start to speed up every now and then but then die back down then one day the throttle wouldn't move and we found that the insides of the carby had worn so I brought a new carby and got it going again but not a full speed but one day I was low on fuel and all of a sudden I was going full speed until I ran out of fuel so I have now figured out if I turn the fuel off then I can go full speed for about 1 min until I use all the petrol that's already in the carby no have to keep turning it on then off to get full speed I have tried the tuning/idle screw and get nowhere it would be awesome if someone could help thanks
     

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  2. crassius

    crassius Well-Known Member

    sounds like you're too rich - first try dropping the needle down a bit to see if that helps
     
  3. Timbone

    Timbone Active Member

    Yes, you are too rich. You know the motor will run because when you cut off fuel flow and the mixture leans out, your motor will run. That's a good sign!

    Make sure your engine is getting good airflow. Make sure the choke is off (not impeding the air intake at all). Take the air filter off and test.

    Almost certainly, this is a carb related issue and it can be addressed.
     
  4. Fender8008

    Fender8008 New Member

    Thank you very much for your quick replies how would I lower the needle and test the air filter thanks
     
  5. Timbone

    Timbone Active Member

    My advice was to remove the air filter housing completely from the carb. Lotsa guys who love 2 strokes are running them with no filter whatsoever! It's very easy to make a simple intake enclosure of plastic, rubber, pvc, etc. that will work just fine and NOT hinder airflow.

    Think about it: the max RPM you can run is determined by how much air is getting into the system. If you are running rich (which causes four stroking). a plan to get more air into the mixture is the right idea.
     
  6. Fender8008

    Fender8008 New Member

    Okay thanks I will try that today and get back to you
     
  7. Fender8008

    Fender8008 New Member

    No luck with removing the air filter still running slow
     
  8. crassius

    crassius Well-Known Member

    the needle is lowered by moving the clip that holds it to a higher position
     
  9. Fender8008

    Fender8008 New Member

    So I just moved it up 1 to lower the needle and it hasn't fixed my problem
     
  10. crassius

    crassius Well-Known Member

    then I'd next try the main jet out of the old carb that worked better
     
  11. Fender8008

    Fender8008 New Member

    Even with my old carby it was running slow though
     
  12. Fender8008

    Fender8008 New Member

    For some reason just all of a sudden it started going slow then I had the carby stuff up so my mate put his until my new one came because he was getting his bike painted at the time and with his as well it ran slow so I have no idea it's annoying the hell out of me
     
  13. Timbone

    Timbone Active Member

    Well, if you are absolutely sure that you have ruled out the carb, then double and triple check your electrical. Make sure all the connections are sound and check to make sure the spark plug cap has a good clean connection to the plug.
     
  14. Fender8008

    Fender8008 New Member

    Okay thanks I will try that today
     
  15. Fender8008

    Fender8008 New Member

    Ahah still no luck
     
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