First Build... First Run... FIRST WRECK!!!

Discussion in '2-Stroke Engines' started by lsoult, Apr 27, 2011.

  1. lsoult

    lsoult Member

    Hi. After about a month of taking my sweet time and reading numurous threads I finally finished my bikeberry 66cc.

    I put it on my undersized frame and had to use a bent copper pipe JB welded between the carb and the intake to clear the top bar.

    After a few atempts I got the bike running smoothly with appearent choke and idle bugs to work out later. What a blast. I couldnt believe it actually worked the first time out. Very satisfying

    I was riding up and down my hilly street in the pennsylvania when my drive chain popped off and locked up the back wheel. I went down hard and put a nice ding in my gas tank. The carb broke loose from the copper pipe I mentioned earlier, and i limped my bike back home. That was a few days ago and I'm still sore.

    I put it back together, tightened my fasteners and tried it again.

    Now my bike wont run. I can coast with the motor engaged but it's not firing. I cant see where anything is different from when it was running.

    Any ideas?


  2. bluegoatwoods

    bluegoatwoods Well-Known Member

    Oh, man, such a bummer........
    For whatever it's worth, though, you're not alone. We feel your pain. Even though that's never happened to me, every single one of us has gone through something heartbreaking with these bikes.

    As for your actual troubles now......I'm no authority on this. Someone with better ideas than mine will come along. But in the meantime, I'd look for spark. It's true that having your carburetor knocked off could be giving you fuel feed trouble. But the symptom you just described gives me that no spark feeling.

    Good luck to you.
  3. Al.Fisherman

    Al.Fisherman Active Member

    Start with disconnecting a kill switch if installed. Now work back from the spark plug to the magneto, checking for fire along the way.

    This is what I made to check my magneto. I remove the spark plug, remove the magneto cover, and turn the shaft with a socket. Made out of a 12V LED from Radio Shack.

    <a href=";current=P10100262.jpg" target="_blank"><img src="" border="0" alt="Coil test light" ></a>
    Last edited: Apr 27, 2011
  4. lsoult

    lsoult Member

    I checked all my wire connections and my spark plug connection. I read on another thread about grounding the spark plug to a heat fin. I can try that.
    Last edited: Apr 27, 2011
  5. Al.Fisherman

    Al.Fisherman Active Member

    Are you getting spark out of the plug wire, if so replace with a NGK or other GOOD plug. This will entail changing the spark plug boot.

    The only things that I can think of for no fire are...
    1. Engine not in time (sheared pin under mag)
    2. Defective magneto... includes broken wire within the coil.
    3. Bad wire connections
    4. Defective kill switch
    5. Defective CDI
    6. Defective spark plug wire
    7. Defective spark plug boot
    8. Defective spark plug.
    Last edited: Apr 27, 2011
  6. lsoult

    lsoult Member

    Thanks. Sounds like a lot can go wrong. I'll do a detailed process of elimination when I get home.
  7. motorpsycho

    motorpsycho Active Member

    if the carb. came off, and tumbled down the road, I would bet that the flaot got shifted sideways. this will cause the needle & seat to be closed all the time, not allowoing any gas to get into the floar bowl.
    to check for spark, remove the spark plug, hook the wire back up to it, and set the plug on the cylinder head. crank the motor over a few times and watch for spark at the electrode on the plug.
  8. lsoult

    lsoult Member

    Elimination complete. I have spark.

    Took her out for another try. Now the motor is firing when I go down hill. But there's no throttle response. It's twisting but no gas.

    -So I opened the fuel valve, un-hooked the tube to ensure proper flow to the carb. It was fine.

    -I took off the top of the carb and removed the carb/intake assembly from the motor and ran some guitar string though it to make sure I didnt inadvertantly get some JB weld in there. It was clear.

    -I put everything back together to find that now my throttle wont twist.

    -Got disgusted and went in the house to make dinner. I'll give'r heck again tomorrow

    Got spark... Got Flow (well had flow anyway)

    Once I screw around with and get twist again I can't think of a reason I wouldnt get a throttle response. Any Ideas?


  9. motorpsycho

    motorpsycho Active Member

    you put the slide back in the carb wrong and that's why your throttle won't twist.
    Pull the slide back out and look at it carefully. you should see that it has 2 slots in it on the sides 180 degrees away from each other (a long slot and a short slot).
    look down in side the carb body and on the right side(looking down from the top with the carb installed on the intake tube) you shoudl see a small pin cast into the side of the throttle bore.
    Line the long slot in the slide up with this pin. The short slot goes to the left side where yout idle screw is at.
    what happens a lot of times is that guys just try to put the slide back in so it fits, but only one way is correct.
    if the short slot is lined up with the pin, the slide will bind up, not work correctly and you will either get wide open throttle all the time, or no throttle response.
  10. lsoult

    lsoult Member

    Thanks Psycho-

    Thats why I love this site. I would have figure that out eventually but probably after a lot of head scratching. Experience is the most valuable tool someone can lend you..

    Thanks again.

  11. blue 48

    blue 48 Member

    sounds like your float is jammed shut like mentioned in other replies above! lets us know if u get it running ill be interested thanks
  12. lsoult

    lsoult Member

    I got the slide in correctly. Thanks for the tip. Since last night was soccer night for the kids I didnt get time to mess with the float. But I took a few minutes to try to fire it up... No luck.... I have to take the carb off tonight to change the intake elbow mod to what oldguy*** is using. I'll check the float then.
  13. lsoult

    lsoult Member

    It was the float. Thanks for the advice.... I'll be MB'ing it to work Monday. You guys rock! Couldn't have done it (for free) without you!

    Now I need to find a forum that will tell me how to heal the muffler burn from my wreck... LOL!!!
  14. motorpsycho

    motorpsycho Active Member

    buy a big aloe plant...that will cure the burns.
    or, buy some exhaust header wrap, and wrap the whole pipe with it.
  15. lsoult

    lsoult Member

    thanks for the tip...The heat shield is on its way... btw- I rode my bike allover my little town today... very satisfying.....