Motor wont start..

Discussion in 'Motorized Bicycle General Discussion' started by dumpstercrusher, May 25, 2013.

  1. dumpstercrusher

    dumpstercrusher New Member

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    Well my motor is pretty new with less than 100 miles and for the past couple of days i couldnt get my motor to start.. i changed the spark plug, changed the spark plug boot and i jus switched over to 32:1 which i rode wit that mix for a couple miles. Tried messing with the choke but nothing. Im thinking maybe my cdi is bad or maybe my magneto but i dont have a tester. i dont know if i should buy a new cdi or magneto or both or if i should jus go ahead and buy a new 2 stroke motor so i can actually mount the motor propperly on the bike..
     
  2. dumpstercrusher

    dumpstercrusher New Member

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    Also if i buy a new motor i can actually look at getting a sbp shift kit
     
  3. Desert Rat

    Desert Rat New Member

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    take spark plug out of motor, hook up to boot and sit it on top while
    pushing bike, you should see the spark if there is one, night time is best time to do this.
    hope it helps
     
  4. maniac57

    maniac57 Old, Fat, and still faster than you

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    If you were running 16:1 like the book says, your plug is probably fouled. Remove and clean or replace the plug and then check for spark like Desert Rat said.
     
  5. dumpstercrusher

    dumpstercrusher New Member

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    def will do the spark plug test tonight. yea i was running 16:1 but then i changed out the spark plug to a new one tonight but still the same thing.
     
  6. crassius

    crassius Well-Known Member

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    you sound kind of frustrated with it - stop for a couple days and go after it fresh
     
  7. maniac57

    maniac57 Old, Fat, and still faster than you

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    I have a special stick I use when all else fails.
    But its a VERY special stick, passed down through generations of chinese engine mechanics and infused with ancient chinese secret engine-fu powers.
    Do not attempt this with any ordinary stick.
     
  8. Desert Rat

    Desert Rat New Member

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    You did say stick, yes? that must be one special stick LOL:)
     
  9. dumpstercrusher

    dumpstercrusher New Member

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    Faster i work at this, the faster i can get this thing up an runnin haha tryna take this out on some longer rides
     
  10. BigBlue

    BigBlue New Member

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    Two important tools you should have is a DMM (Digital Multimeter) and a torque wrench. You can buy a DMM for $5.00 and a torque wrench for $20.00 at Harbor Freight. Look at a garage sale for tools and you can find a torque wrench for less.

    You made a comment in your original post about mounting your engine properly in your bike. What did you mean by that? Is your engine not currently mounted correctly? The carburetor should be level as possible.

    Here's a couple guides to help in no-start situations:
    https://docs.google.com/document/d/1aBeJuoS--VQWwXysc07rpscTUbPzgc93xjiQBgsyFjc/edit

    http://www.grubeeinc.com/USA/2 cycle engine trouble shooting guide.html

    If you don't have the ability to read Googledocs, here's another guide from the other forum:
    http://www.motoredbikes.com/showthread.php?34942-What-EVERY-NOOB-needs-to-read

    Disconnect your kill switch to see if it will start - sometimes they are defective. Also, try staring without the gas cap, as sometimes they are not vented.

    Hopefully, you didn't ride it in the rain or leave it sitting in the rain to get wet. This will cause rust to develop on the ignition coil/magneto and cause starting problems.

    Make sure the spark plug wire is securely attached to the CDI.

    Make sure no bare wires are touching the frame and that all electrical connections are secure.

    Last, try to start it with a little starting fluid or a few drops of fuel into the spark plug hole and then put the plug back in and try starting.

    Buying parts to see if the problem goes away is an expensive way to problem solve. Buy the proper tools as I mentioned earlier and you'll end up money ahead.

    Good Luck,

    Chris
    AKA: BigBlue
     
  11. 2door

    2door Moderator
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  12. fatdaddy

    fatdaddy New Member

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    All good advice BB, Nothin left to say. C'ept what 2door said.
    fatdaddy.
     
    #12 fatdaddy, May 26, 2013
    Last edited: May 26, 2013
  13. fatdaddy

    fatdaddy New Member

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    Yes dumpstercrusher, there is another forum. Been there, done that, This one is better.
    fatdaddy.
     
  14. BigBlue

    BigBlue New Member

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    Couldn't find the link to AI.Fisherman's guide here, so I offered what I knew and had bookmarked. Now I bookmarked the above link for future reference.

    Thanks Tom,

    Chris
    AKA: BigBlue
     
  15. dumpstercrusher

    dumpstercrusher New Member

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    Thanks for the post! I def have the tools which is how I managed to install the motor onto the frame, but I dont have the DMM. I would need to go and pick that up. Also when I bought the motor (without any knowledge of universal mounting kits) it would not fit on the frame properly in the front, sooo what I did was grind down the dip to a little wider to fit the frame and drilled me in some new bolt holes. Well one of the bolts had ripped out because it wasn't deep enough so I took so metal wrap with holes? and wrapped the motor into place with of course the back end secured with the bolts. The motor doesn't budge at all so Im fine with that but if I could redo the mounting part I would totally go for it after gaining more knowledge wit these bike motors. I think tomorrow Im going to try and see if I can get a spark from the spark plug by touching the cylinder wall as was posted above and I'll go from there or get a DMM to test out the polarity of the wires.
     
  16. dumpstercrusher

    dumpstercrusher New Member

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    Should i be getting oil/gas mix in the magneto area? the wrapped portion of the magneto is black from throil/gas mix. Got my buddies bike in the basement so im going to be swapping out parts to see which one has failed on me. ill report back!
     
  17. bigbutterbean

    bigbutterbean New Member

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    You got a bad crank seal. You basically have two options. You can take the engine apart (split the crankcase) and replace the bad seal. Or you can replace the engine. Its up to you, but the engine won't run the way it is.
     
  18. dumpstercrusher

    dumpstercrusher New Member

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    thanks for ur input, i guess its better for me in a way to properly break this in
     
  19. 2door

    2door Moderator
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    DO NOT SPLIT THE CASE!!
    The crankshaft seals are replaced from the outside.
    The one behind the magneto rotor (magnet) is the easiest. Remove the rotor and carefully pry the seal out with small sharp tool. New seals are available here from most of the sponsors. The thin one goes behind the magneto, the thicker one behind the small gear on the right side of the engine.
    There are many threads here with detailed instructions on replacing crankshaft seals.

    Tom
     
  20. dumpstercrusher

    dumpstercrusher New Member

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    oh dont worry, im just gonna go ahead and buy me a new motor so i can do this the right way. old motor i full throttled it and had the motor mounted not correctly so starting new and fresh is better. Question now is, which company to buy a motor from? i see skyhawks which is the only other motor i know or should i go with a more performance motor since im gonna be doing bolt ons anyways to go faster. Love modifications
     

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