Bike was running 1 month ago...now won't start...

Discussion in '2-Stroke Engines' started by kamikazi_kostka, Mar 10, 2007.

  1. basically..I stopped riding my motor bike one month ago, cause I broke my clutch lever..and had to replace it, and also cause we had giant snow falls here in Wisconsin.

    Now, it is all almost spring at 50 degrees out.

    Today I redid my clutch lever..and tried to start it...it spurtered for like 1/2 a second...then nothing. I repeatedly tried to start it, with no success.

    I then checked my connections for CDI, and redid them. It made no difference.

    Right now, when I disengage my clutch lever, the rear tire just locks...chain doesn't move. My bike always use to catch.

    Could my magneto be bad? Could my spark plug be fouled? Does my carb need a cleaning?

    What do you recommend I try first, cause I know the clutch is not what messed it up.

    Please help me asap.

    Chris
     

  2. gone_fishin

    gone_fishin Guest

    spark and fuel will be first tests, my vote is a fuel problem.

    mechanically speaking, i couldn't quite decipher your symptoms: with the clutch engaged & spark-plug out, will the wheel/chain/drive sprocket/engine turn?

    if yes, then my basic mechanical-experience says try "cleansing" the cylinder by pedaling (fuel off/throttle closed) the engine around for a bit, then do the spark and fuel checks. if no, then you're gonna be looking for something mechanical caused by the bike sitting for a month.

    this is only guesswork, i happened to be here when you posted so i figured i'd ramble a bit. best i could come up with for an "asap" step one, i'm sure one of the more 2-stroke experienced dudes will have something for you. coupla questions for them: won't month-old premix get all gummy in the carb? are the rings/cylinder at risk when you let the engine sit too long?

    good luck.
     
  3. Guest

    Guest Guest

    No, a month will not cause the gas to go bad. Sitting for that period is not going to hurt the engine as far as rings and piston go.

    First, take the plug out, and turn the engine over with the plug in the plug wire, and grounded to the engine, you should have spark. If you have spark, then you may have a fuel problem.....Make sure you have fuel flow to the carb. If you have a spark and fuel, then you may have a fouled plug (it will spark when out of the engine, but not under compression) Also, just because the plug sparks, doesn't mean it's not fouled.

    One more thing- these Chinese engines have notoriously bad spark plugs....do yourself a favor, and buy a good name brand replacement (NGK, Bosh, Autolite, Champion)
     
  4. Guest

    Guest Guest

    Oh yeah, let us know what you find, or don't find.

    Also, to check your spark, you may need a helper.....someone to walk the bike or turn the back wheel while you hold the plug to the cylinder head.

    If you do find you have spark, put a couple drops of gas or acetone down the spark plug hole, replace the plug and give 'er a shot. It may just fire up.
     
  5. What I have realized is that my gas line is 1/3 full of fuel, if I turn it on..it stays that way...usually it drains.

    I am guessing that I have a clog or bubble in my carb, that would make sence for why it fired first...then wouldnt' do it again.

    I will take off carb and clean it...also take out spark plug and clean it.

    I have a spare spark plug I ordered from King's Motor Bikes...should I put that in yet (I have about 35 miles on this engine so far)?

    Thanks...
    Chris
     
  6. srdavo

    srdavo Active Member

    sounds like your needle valve may be stuck. easy to fix, when you take off the float bowl.
    A new sparkplug never hurts.
    here's a link to some sparkplugs that work in our Chinese engines.

    http://www.motoredbikes.com/viewtopic.php?t=402


    keep us posted....
     
  7. Guest

    Guest Guest

    If your gas line is 1/3 full then drains, I'd check for obstructions in the tank or fuel shut off/fuel line/filter. Also check to make sure your cap is venting properly.
     
  8. Ok...i worked on the motor bike for an hour so far today

    1) Took off carb, drained fuel out of the bowl, then reput it on.
    Tried starting it...nothing...the thing is...usually if it doesn't fire...it just grunts or something. But when I release the clutch lever...the rear tire is just locking. What would cause this? I re-did the clutch lever (that is why it was not used in a month...my clutch lever needed to be fixed)...So currently, I have my clutch lever (with locking piston)....so when pulled..I can pedal, and when released the chain locks.

    2) Then I took out the spark plug to find it was corroded with carbon.
    I cleaned it...put it back in. Tried to start...nothing..back tire just locks after I release the clutch lever.

    3) Put in a new spark plug, tried to start...back tire just locks.

    4) Put drops of fuel inside cylinder and then put in spark plug. Still wouldn't start...rear tire just locks.

    The common problem is that the rear tire and chain just locks...and nothing fires.

    What do I do now? The weather is 55 degrees..and I really want to ride...is fuel not getting to cylinder? Is spark plug gap not right? Is magneto not working? Is my setting on my carb not right (fuel mixture)...It ran fine during winter months...don't get why rear tire is looking and not working.

    Please help me
    -Chris
     
  9. Also...when I turn on my fuel line...it starts...but it doesn't fill...just comes in a bit...and stays abou 1/3 full. My gas tank is 2/3 full of gas/oil.

    so I don't know what my problems are. Thanks for any more help you can provide.
     
  10. I could remove the throttle cable I guess...but when I just removed the carb from the intake manifold, if I twist the carb, the needle thing goes up, and when I release, it goes back down.

    I don't think that is the problem. Is there anything I could have done to the clutch to screw it up?

    Bike was working, but then I tried making clutch tighter...then I broke the clutch lever. Then I put on a new one..and now it doesn't work.

    I just don't know what the problem is.

    Thanks,
    Chris
     
  11. srdavo

    srdavo Active Member

    did you take your float bowl off your carb? just wondering if your needle valve was stuck?
     
  12. how would I know if it was stuck?

    I opened up the bowl and drained the fuel out...but it is apparent that no fuel is being taken out of there the bowl...

    How do I fix it if it is stuck?
     
  13. is the needle float just the thin flimsy crescent shaped metal thing that the fuel comes out on...and rest above the fuel bowl?

    That is moving free.

    The biggest problem is, I don't think gas is getting into the intake manifold.

    What would cause this?

    Chris
     
  14. srdavo

    srdavo Active Member


    ok.....fuel in the bowl means needle is not stuck. thats good
    sounds to me, your clutch is working ok.
     
  15. then what could be the problem?

    Spark plug, magneto? Could fuel not be getting into the cylinder? What would cause this?

    Thanks
     
  16. srdavo

    srdavo Active Member

    the flimsy metal 1/2 moon thing holds the needle valve in place & tells the gas when to quit coming in to the bowl.
    if no gas is going to your intake, then your jet could be clogged.

    do you have spark?
     
  17. how do I know if it is clogged? everytime I turn on the fuel valve, the bowl refills with gasoline, so I know it isn't fuel line related.

    What would cause the rear wheel to lock though?

    I don't even know if I have spark...how do I safely test for that?

    Thanks,
    Chris
     
  18. srdavo

    srdavo Active Member

    back in this same thread, Bikeguy Joe tells you how to test for spark.

    "First, take the plug out, and turn the engine over with the plug in the plug wire, and grounded to the engine, you should have spark. If you have spark, then you may have a fuel problem.....Make sure you have fuel flow to the carb. If you have a spark and fuel, then you may have a fouled plug (it will spark when out of the engine, but not under compression) Also, just because the plug sparks, doesn't mean it's not fouled.

    One more thing- these Chinese engines have notoriously bad spark plugs....do yourself a favor, and buy a good name brand replacement (NGK, Bosh, Autolite, Champion)
    Also, to check your spark, you may need a helper.....someone to walk the bike or turn the back wheel while you hold the plug to the cylinder head. "



    If you've replaced the sparkplug, then you should have spark. but you should check anyway.
     
  19. srdavo

    srdavo Active Member

    compression!
     
  20. Guest

    Guest Guest

    1.) Excessive carbon on the plug is from too much oil in the fuel/oil mix. That same carbon build up is on the piston too, if really excessive it could lock the piston but that would be extreme.
    2.) From what you are explaining, the problem is not with the fuel/carb/ect.

    Sounds like one of two things-the engine/piston is seized or locked up for some reason. Or... when you reassembled the clutch, you somehow got something out of whack and the whole mess is locked up. If it were just compression, it would turn over when you pop the clutch just like it always did.

    When you have the plug out, does it turn?
    If you leave the clutch engaged and rock the bike, does ANYTHING move?
    Have you gone over your assembly steps to see if you put something together wrong? You may want to backtrack all you did to the clutch and see of the engine turns over.

    Let me know what you find.
     
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