Engine Trouble 70cc bicycle motor wont start

Discussion in '2-Stroke Engines' started by captain, Sep 8, 2007.

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  1. captain

    captain Guest

    Hi, I just completed my bicycle with the motor set up 70cc. I can't seem to get it to start. What am I possibly doing wrong. I have primed the carb. I have peddeled and attempted to start the engine on three occaisions. Have I wired something incorrectly? I should be able to be peddle freely and then engage the clutch to start this correct?
    Can someone help me out or give me some other ideas. I am out of ideas.
    Thanks Dan:shock:

  2. Joshboy

    Joshboy Guest

    i'm having the same problem with my 80cc HELP!!!
  3. captain

    captain Guest

    70cc bicycle engine

    I am still having troubles figuring this install out. It appears I have no spark also from what I can tell. I bought this kit early in the year from Dacscommm. It is a howell engine which It appears won't work? I have emailed him and he referred me to here for help. I don't know what else to do. I thought I would be riding this but I was wrong? I guess I will tear it down and toss the thing in the trash.
    Last edited by a moderator: Sep 9, 2007
  4. Double check your wiring!
    I had a little problem there at first and my wife laughing at me as I pedaled and it wouldnt start didnt help other than to motivate me to find the misplaced wire.

    The anwser is most likely here. If you have it wired properly and the kill switch is hooked up try it without the kill switch, it may be grounding out on you.

    My dacscomm engine works fine and so will yours.

    If you decide to trash it let me know and I'll pay shipping to my house-lol
    Last edited by a moderator: Sep 9, 2007
  5. captain

    captain Guest

    70 cc bicycle motor

    Thanks I will try this sometime today or during the week. I wil keep you posted.
  6. thatsdax

    thatsdax Guest

    Check for spark

    Check for spark. Tell us how you checked for spark. Tell us how you know it is or is not sparking. Thanks..
  7. Alaskavan

    Alaskavan Guest

    We've got a simple little tool at work for checking spark. You plug one end into the plug wire and clip the other end to ground. It has an adjustable gap, so you can get a good idea of the strength of the spark too. It's not an electronic gadget, so it will always give you the answer about spark. (I'll bet you were waiting for a punch-line.)
  8. I wonder how Captain did with all that. Hope he didn't actually throw the whole thing out. That would be so tragic indeed.
  9. I dont think he'll actually throw it away but I know how he feels when things just dont work right from the get go.

    I'd bet it is just something simple out of place.

    I'm glad I didnt do the "Griswald family christmas light thing" with mine the first time I tried to fire mine up-lol
  10. captain

    captain Guest

    When I checked for spark I did the usual i've always done. I pulle dthe plug rechecked the gap. Had the bike lifted up so I could pedal it. While the plug was out looking for spark as I've done many times before. No spark was visable. Same system i've used on motorcycles, mowers, chainsaws, leaf blowers weed trimmers etc. I am no stranger to working on engines, but this has me wondering. I am going to recheck the wiring and pull off the kill switch wire to see what happens.
    I wouldn't throw it away. I am just very frustrated at the moment.
  11. gauge

    gauge Guest

    the way i check for spark is put my hand on the plugwire and pedal up to 15 mph pop the cluck and with my other hand on the handle bar it will shock u i theres spacrk lol
  12. davidsis

    davidsis Guest

    Do you really check spark that way?
  13. Alaskavan

    Alaskavan Guest

    I'm betting on it being the kill switch.
  14. Scottm

    Scottm Guest

    How is it working out, if you've had a chance to mess with it yet?
    When you get it working, you will have a great time and the frustration will be worth it. I've had my share of frustrations too, but buzzing down the street on something I and (MBc) built, makes it all worthwhile.
    Good luck.
  15. ibeenjammin

    ibeenjammin Guest

    check your wiring all the way to your magneto. I have read other posts of the wire not soldered correctly to the magneto. This will mean that you will have to remove the cover to check. I had to remove the kill switch on my bike after spending about 20 minutes trying to get the bike started. Once I removed the kill switch.....tah-dah!
  16. gauge

    gauge Guest

    yeah lol thats how i check for spark
  17. gauge

    gauge Guest

    opps i forgot i posed that yesterday
  18. captain

    captain Guest

    70 cc bicycle motor update

    Hi all, Removed the kill switch, tried again to restart by priming carb., peddling until exhaustion, rechecked wiring no luck. Will have to follow the wiring into the magneto thing. If anyone has other other ideas please let me know. After this I don't know what else to do. Is there any where I can buy anyother coil if I have to?
  19. japat100

    japat100 Guest

    don.t use up energy if you have no spark ,,,by now i would think you have it wired up right ,, i think you may find out that someone already posted the answer to the problem ,, if you take the cover off you will find the solder joint let go ,so if you see a solder joint with no wire attach ,the wire could be near by there ,or also could be pulled into the wire harness , ,and the more you play with the wires the more chance for it to happen , 10 or 15 minutes to fix it
    if you have spark and you primed the carb , and it still don"t try to start then i would say check your head bolts .
    good luck
  20. thatsdax

    thatsdax Guest

    Yes.. You need spark.

    The system is simple. You have a magneto and the CDI with plug wire and cap. If you disconnect the kill switch and still have no spark, it is either mag or CDI. I have only seen 2 or 3 CDI's go . So... More than likely it will be the magneto. Check the mag by resistance check. Between Black and blue should show around 260 ohms disconnected. Enjoy the ride...