Honda two-stroke cuts out. [was: Engine cuts out]

Discussion in '2-Stroke Engines' started by clueless joe, Dec 18, 2009.

  1. clueless joe

    clueless joe New Member

    I just changed out my spark plug and now as I'm riding, the engine seems to cut out for a few seconds and then kicks in again and it continues that way all the way to my destination. It never dies on me but the rides a bit rough. Any suggestions? You know you guys are my new best friend because as the name suggests, I'm clueless to this stuff. Thanks:dunce:

  2. Al.Fisherman

    Al.Fisherman Active Member

    Go back to the original plug and test to see if the problem is cured. If not then the coil/cdi/ground problem might be it. The electrical systems on these engines are so simple.
  3. clueless joe

    clueless joe New Member


    Al, thanks for the suggestion, but that's why I changed out the plug in the first place. The new plug was fine at first, but after about 15 minutes, started exhibiting the same problem as the old one. So now as to the coil\cdi-thingy, how do I check that? Sorry to be so dumb, but the good thing is I can still learn new things. Thanks for your patience.
  4. Al.Fisherman

    Al.Fisherman Active Member

    Here is the problem..first I keep on hand a spare CDI and Coil...they are about $10.00 each. When you have interment electrical problems its hard to tell which one is the problem. Could be your kill switch..disconect it and ride. Besides on a long trip a spare coil/cdi is nice to carry as they are light. I had a CDI go out within 3 days of building bike. Hence the red vendor in my signature

    15 minutes..maybe the spark not hot enough to fire through oil coated plug...plug color/picture????
    By the way, not to get on you, but when describing a problem you need to tell the whole that is why you changed the plug in the first place.... "I just changed out my spark plug and now as I'm riding"
    Last edited: Dec 19, 2009
  5. AussieSteve

    AussieSteve Active Member

    What Al said, plus check that your wiring connections are tight and that you have good fuel flow.
    And which engine? This thread might have been better in 2-Stroke Engines or 4-Stroke Engines.

    ... Steve
    Last edited: Dec 19, 2009
  6. clueless joe

    clueless joe New Member

    Thanks for the input. In the future I will try to be more explicit. My bike has a honda 2-stroke engine 68.9 cc I believe. It was built for me by a young man at our church, but he's so busy with school and work to really mess with me and that's when I found you guys. The bike is used basically as transportation to work as I'm only 3 miles away and we only have one car and my wife needs that so...Anyway I guess I should have used this as my introduce yourself, but I was so anxious to get the answers I needed, that I guess I tried to cut corners. As I said though I can learn.
  7. retromike3

    retromike3 Member

    are you sparken?

    One thing you might check is if you have a decent spark.

    Step 1 remove spark plug
    step 2 place connected spark plug on head or grounded surface.
    step 3 lift rear wheel
    step 4 engage cluch
    step 5 give bike a good stroke on pedal.
    step 6 look at plug and see how well it sparks

    For me I started with the plug. I got a new one and gaped it to .026 then I sanded the gap[ with 600 grit sandpaper. Later I got a new shielded plug wire(to keep my speedometer from frying). I got a new CDI(not because it failed but because I damaged it when I moved my stuff over to a new frame.)Finally I replaced my kill switch and throttle because it seemed to be shorting. It's been running like clockwork for about six months now.

    grand total spent about forty five dollars. Luckily were not fixing Ferraris.

    Mike Frye the bike guy
  8. AussieSteve

    AussieSteve Active Member

    Joe, we were assuming that you had a Chinese 2-stroke. A Honda, you're lucky.
    Where is the engine mounted and what sort of drive train does it have? Chain, friction roller, belt etc.
    How is it started? ie. Clutch-start, pull-start, kick-start.

    As Al said, the plug could be oiling up. What colour is it?
    It sounds like your problem might lie in that area.

    You're not leaving the choke on?

    ... Steve
  9. motorpsycho

    motorpsycho Active Member

    if the cdi or mag. are bad, it more than likely would not be an intermittent problem. normally a cdi / mag. either works or it doesn't.
    I would check the spark plug wire, or just replace it.
    or, a power wire to the cdi could be grounding out against the frame.
  10. loquin

    loquin Active Member

    Do you have a remote kill switch installed?

    (BTW - moved the thread to the correct forum, and edited the title to be more descriptive...)
  11. clueless joe

    clueless joe New Member

    To try to answer all the questions... The engine is mounted in the space between the wheels, just underneath the seat and just forward of the pedals. I have to pop the clutch going around 10 mph and I choke it at start up and about 8 to 10 seconds later I turn the choke off. I do have a remote kill switch. The drive train is a chain. I just removed the plug and there was a slight bit of gray coloration on the electrode, but that was the first time I rode with that plug. The plug I replaced was dark gray to black, on the threads and looked like a bit of carbon buildup on the electrode. I've only had the bike a few months. Thanks again for all the input. I will try some of the suggestions and get back tio you as to the results.
  12. clueless joe

    clueless joe New Member

    Merry Christmas all. As of the last reply, I tried riding my bike and got absolutely no spark on the new plug, so I put in the old plug and everything seems to be back to normal. I rode the bike a couple of miles and there was a little bit of cut out with the engine, but nothing compared to before. I can't explain it. I will ride it as is for now, but will invest in a cdi and coil, just in case. I hope you all have a great new year and I will keep you posted as to my progress.
  13. GearNut

    GearNut Active Member

    Is sounds as though you are figuring out the problem. Well done. Please continue to keep us posted on your progress. You certainly have my intrest piqued!
  14. clueless joe

    clueless joe New Member

    Thanks for the vote of confidence, though short lived. I rode the bike to work the other day and it ran good, but it wouldn't start at all to come home, when I say it wouldn't start, I mean I'd pop the clutch and there would be nothing, so I had to leave it at work and call the wife for a ride. I was able to put it on a rack and bring it home yesterday and I plan to take it back to the guy who built it today and tell him to fix it. I'm pretty well disgusted with it. He thinks it may be the magneto.. me I'm clueless. Will let you know what I find.
    Last edited: Jan 5, 2010