please help need for work

Discussion in '2-Stroke Engines' started by charlie15643, Jun 6, 2015.

  1. charlie15643

    charlie15643 New Member

    Was riding my bike today was riding 10 km and in the middle my engine stopped working. Gas is still in the tank, the tank is straight. engine just wont run no matter what i do. How do i fix this?
     

  2. 2old2learn

    2old2learn Member

    As you know, an engine needs fuel, compression, and ignition at the right time to run. Verify each one of these is occurring. Start with ignition, then fuel then compression.

    Pull your plug and put it back in the spark plug wire and set the tip of the plug against the motor and turn your motor over and watch for a healthy spark to jump across the electrode of the plug. If that looks OK put plug back in. If not, check your coil and kill switch.

    Next verify fuel flow by turning off your gas line, removing it from your carburetor and get a small container to catch fuel in and turn on your fuel valve and verify fuel flow. If that looks OK then check compression.

    To crudely check compression with spark plug out of engine and out of the coil wire and coil wire away from your hands and preferably with kill switch set to kill the engine, place a finger over the spark plug hole and turn over the engine feel how much compression is generated. If it's significant then it probably is not the problem.

    This then makes the carburetor suspect. You may need to remove and clean your carburetor especially the needle valve which regulates the fuel flow.

    Let us know what you find out.
     
  3. crassius

    crassius Well-Known Member

    start with the standard check list for 'bike won't start"
     
  4. charlie15643

    charlie15643 New Member

    Im getting no spark everything is good but still no spark i have a ngk spark cap and ive checked all wires still nothing
     
  5. bluegoatwoods

    bluegoatwoods Well-Known Member

  6. mikemarley

    mikemarley Member

    id try looking at the magneto loop, a kill switch negativly shorts the coils to kill them, and is hard on electrical components. i would definitely try a new plug and then if that doesnt work try a new magneto loop
     
  7. KCvale

    KCvale Motorized Bicycle Vendor

    My troubleshooting procedure is simple these days.

    Disconnect everything.

    Ohm the black magneto wire to a head bolt, it should read a dead short.
    If not, check the ground tab on the magneto.
    Note:
    The new skyhawk CDI's have no white wire, ground is the lower connector but it has a wire from it to ground.

    Old style mags with a white wire have a tab out of the mag that solders directly to the mag base and they can come loose, just hold it down and re-solder.

    Ohm the magneto from the black and blue wire, 320-380 ohms is ideal, an open or dead short means a bad magneto if the wires are connected.

    Ohm the CDI in the 10K-20K scale.
    Red+ meter probe to CDI black wire.
    Black- meter probe to the spark plug cap.
    You should get about 6.9K ohms.

    If not it could be a bad wire or cap.
    Unscrew the plug wire at the cdi, use pliers or even cut it off and dig the junk out if need be and do the same test above again to the cable screw on the CDI.
    If that works get a new wire and plug cap, if not you have a bad CDI.

    If all of that is good there is only one thing left, the magnet.

    That was indeed the problem with this repair on a new build with a 2014 gasbike.net front page engine kit.

    When you pull the 4 bolts out of the magneto mount it should slam itself against the magnet, I mean to the point where it is hard to even get your first bolt in.
    A weak magnet that lets you move the mag around pretty easily is not strong enough to create a spark which is what this repair had.

    Magnet replaced, problem solved and my repair is done.
     
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