Engine Trouble Running but cutting out??

Discussion in '2-Stroke Engines' started by 2strokejosh, Apr 24, 2012.

  1. 2strokejosh

    2strokejosh Member

    Hey There I'm curently running a 49cc engine (unknown make) on my 26inch bike. It has a champion spark plug and thats about it, Its been good and reliable from when I got her 3 mounths or so ago.. in the last fuw days its been cutting out at highish rpm like you hit the kill switch and than you have to wait 20 secs or so an she fires up good for a good 30 secs or so or untill you get up to high rpm ??. Ive cheakd the spark its fine and Ive pulled apart the carby twice that was allso fine.. this might of started when I put 98 octane in 3 days ago..Ive draind it all out and going to try 91 again tomorro hopefully shes all good again =( any help would be good thanks Josh.
     

  2. Al.Fisherman

    Al.Fisherman Active Member

    First I'd go with the cheapest..what 87 octane? Anything more is just a waste of money flowing out the exhaust. I'd disconnect the kill switch and ride, vibration might be the problem. Did you use the frame as a ground? Tank may need better venting. Float may need adjusting. Sounds like it may also be fuel starvation. Oh go with a NGK plug, cap and good plug lead. I stay away from Champion plugs. In a GMC I go with AC, in a Ford, I go with Autolite and 2 cycles a NGK. lawnmowers a AC. Experience dictates.
     
    Last edited: Apr 24, 2012
  3. Lunardog

    Lunardog Member

    Any chance you've developed a kink in your fuel line??
     
  4. Al.Fisherman

    Al.Fisherman Active Member

  5. 2strokejosh

    2strokejosh Member

    Hey there mate, yea 91 is the cheapest fuel over here in aus Im pretty shore. I just thought I'd give 98 a shot :l I'm going to give it a go in a hour or so with 91 octane in HOPEFULY its the problem. Yea I have looked at my tank cap and its all good (fuel flows well), my float in the carb is good (sitting inline with my jet). I'm also going to cheak my kill switch today to. Grounded to the bike? Thanks for the help mates! Josh.
     
  6. 2strokejosh

    2strokejosh Member

    I have looked an it doesnt seem to and its flowing good. thanks mate!
     
  7. 2strokejosh

    2strokejosh Member

    and yea Im going to try the ngk plug an lead of the net. the champion has been good so far..
     
  8. motorpsycho

    motorpsycho Active Member

    champion spark plugs are just about as good as having a bike with no chain.
    you don't need to buy a spark plug wire off the internet.
    you can get one at your local auto parts strore cheap (an automotive wire and rubber boot) which will be 100 times better than the stock one.
    plus, you can get in any length so you can relocate your cdi and hide it out of sight for a cleaner look.
     
  9. 2strokejosh

    2strokejosh Member

    Yea my motor didnt even run with the stock junk.. so I got a champion off my mate and had been perla upuntill now.. As of where I am atm I cant get to any shops with plugs, leads an that. soo Im just going to try 91 octane fornow an see haw that goes! Will get NGK plug and lead next week but Im just hopeing it fuel.. thanks mate!
     
  10. 2strokejosh

    2strokejosh Member

    Got it running with nearly to no vibration =D! I read the wireing up section an I didnt have it grownded to the frame! and I also put 91 octane 25-1 Im pretty shore that was half the problem the 98..
    Thanks heaps guys! Josh
     
  11. Al.Fisherman

    Al.Fisherman Active Member

    Don't ground to the frame, and 91 is wasteful in these low compression engines. Buy the cheapest gas around, what?...87...... Ahhh I see that your 91 RON - Standard Unleaded is ...like our 87 here. Now get rid of the frame ground.
     
    Last edited: Apr 24, 2012
  12. 2strokejosh

    2strokejosh Member

    Hey yea the cheapest fuel here is 91. And the frame ground?? will it cause any damage if I leave it? as its running better than ever at the moment! cheers mate. Josh
     
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