can't get first start!

Discussion in '2-Stroke Engines' started by HadesBike05, Apr 4, 2016.

  1. HadesBike05

    HadesBike05 Member

    Hello all!
    I'm Hade and I have built my 1st mb over the course of a couple of days and with the help of very informed posters on this site.
    Now I have everything mounted, and when I check the electricals there is a spark. But the bike wont start. It just makes the popping noises when I engage the clutch but it wont actually start. I have no clue what to do. I am not sure if fuel is getting to the motor, or maybe too much fuel. When I twist the throttle it doesnt really twist very much but I am not sure if thats normal.
    If any one had any tips or ideas I would be very grateful.
     

  2. Timbone

    Timbone Active Member

    Make your start attempts on a mild hill. Once you pop the clutch, you should feel the engine resistance and hear the engine breathing. Throttle position is important. These 2 strokes like a rich mixture to start and cool weather can make it harder. As you pedal through the engine resistance, use no throttle input at all and see what happens. Try a few times. if you get occasional popping (firing in the cylinder) keep pedalling and let the pops increase. As the pops increase, it's a sign that the engine wants to go. Try some gentle twists of the throttle and see how the motor reacts. If the popping gets better, keep pedalling through and working until you get continuation.

    Maybe your engine needs choke. Choke the carb and then do the same thing. Listen to the engine as you pedal thru the resistance and apply throttle. If opening the throttle makes things worse, it's leaning things out too much. Pedal through with no throttle input and hopefully you will get some popping that will get heat into your engine and spur the process forward.
     
    Last edited: Apr 4, 2016
    FurryOnTheInside likes this.
  3. HadesBike05

    HadesBike05 Member

    Ok il give it a shot. It has been unseasonably chilly lately. It pops when I let the clutch out but throttling does bog or stop the engine. So I'll try peddling through it with no throttle.
     
  4. Timbone

    Timbone Active Member

    If popping occurs while you are pedaling with no throttle, and adding throttle bogs it down ( should make a sad kind of lower tone), most likely the engine doesn't want much air until there's warmth in the cylinder/carb. Be patient. Pedal with little or no throttle and let the popping build. This may elevate your heart rate! Eventually, you'll be able to go with WOT and the motor will get some power and advance.
     
  5. HadesBike05

    HadesBike05 Member

    When I twist the throttle it just stops entirely. Theres a decent incline near where I live Il give it a shot in the morning.
     
  6. HadesBike05

    HadesBike05 Member

    Well i vouldnt wait n tested the theory out n it did aound like it was rumbling a little bit more when I got my bike going fast but then my chain locked up lol. Gonna fix that now.
     
  7. Nanonevol

    Nanonevol Member

    Might try spraying some starting fluid in the carb when you get the chain fixed. It is more volatile than gas and might get things moving.
     
  8. HadesBike05

    HadesBike05 Member

    In the carb or down the hole where the spark plug goes?
     
  9. Nanonevol

    Nanonevol Member

    I suppose either might work but the usual practice is to remove the air filter on the carb and spray it in past the choke plate. You can run it without an air filter for a short time.
     
  10. HadesBike05

    HadesBike05 Member

    Update: I tried removing the filter cover but one of the little screws us really in there n it stripped so its staying put lol i rode up and down releasing the clutch and the engine pops almost like its running but it doesnt start up. There is extreme resistance if I try pedaling past when the engine stops popping. I can only seem to go as far as momentum allows. If there is momentum I pedal and it is easy but once the engine popping slows then stops I cant budge it. Well maybe I could but it seems unwise to exert that much force. On a couple other threads somepeople said that changing the spark plug or cdi got the buke running. When I check the electricals there is spark but maybe it's too weak. I am using the stock plug. Aftet I attempt to start the bike unburnt fuel comes out of the muffler and it is blackish in color. It still rerains the look of the original fluid (greenish) but all sooty. Could it be the engine is just too dirty? Would taking it apart n cleaning it with carb fluid help?
     
  11. HadesBike05

    HadesBike05 Member

    I have the wires making direct contact as well. I stripped them then connected them then covered in liquid tape.
     
  12. bakaneko

    bakaneko Active Member

    You don't need to get a new cdi or spark plug to get it running. What 2-stroke oil are you using and what is the mixture ratio?
     
  13. HadesBike05

    HadesBike05 Member

    Im using american xt 2-cycle engine oil at a 16:1 ratio
     
  14. bakaneko

    bakaneko Active Member

    Yeah, the problem with these engines is that trouble shooting is often difficult. It seems like the cdi and spark plug are fine if you are getting a spark. I would double check to make sure the carburetor is tightly connected and then start loosening the clutch wire (you can properly adjust the clutch later if this is the issue). It might be the engine is not fully engaged when you release the clutch

    - Choke at 90% closed
    - Press priming button 2-3 times
    - Pull in the clutch
    - Pedal to 12 mph
    - Release the clutch
    - Motor should start turning over
    - Keep pedaling until the motor starts to pull you forward
    - Stop
    - Choke at 50% closed for 1-2 mins
    - Operate for 1-2 mins
    - Choke at 0%
     
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  15. HadesBike05

    HadesBike05 Member

    I tried your suggestions and still no luck. I have a buddie that is a mechanic n he confirmed the fuel was getting were it needed to be. If there is too much compression could another head gasket fix this? If its the clutch how do I how if its to loose or tight?
     
  16. bakaneko

    bakaneko Active Member

    Is the engine turning over or you just hear it cranking? at 1 min, the engine is turning over.



    Besides this, you are probably running too rich. I would raise the carb needle (towards the pointy end) a notch or two.
     
  17. Nanonevol

    Nanonevol Member

    This is a new motor? My new China motor build took a bit of fussing and experimentation to start the first time - then suddenly - Varoom! I used starting fluid as I suggested earlier. You could still try spraying it into the air filter if you cant get the filter off. And I don't think it's neccessary but maybe wouldn't hurt to get a better sparkplug.
     
  18. HadesBike05

    HadesBike05 Member

    Yes it is new off of ebay. Do you mean like into the little holes where the air goes up?
     
  19. HadesBike05

    HadesBike05 Member

    Ok il move the needle n take another stab at getting the filter cover off
     
  20. Nanonevol

    Nanonevol Member

    Right, the little holes where the air goes up. You stripped the air filter screw already?? If all else fails drill it and maybe use an extractor. Persevere. As I say, my new Chinese motor off e-bay took some fiddling to start the first time and I experienced the same things you did. Thought I'd pass out at one point but then I'm way out of shape!
     
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