new bike build with a no-start problem...

Discussion in '2-Stroke Engines' started by stackz, Oct 4, 2008.

  1. stackz

    stackz New Member

    just got the bike finished troubleshooting today after putting it together on a small frame mountain bike. all kinds of **** to deal with haha.

    anyway...engine wont crank. I'm getting fuel into the fuel bowl at least that I can see.

    how can I test for spark??

    I had the kill switch hooked up inline with the blue wire. also, I wired it blue to blue and black to black between the magneto and the engine.

    after it wouldnt crank I read that the kill switch can cause problems so I bypassed it but still no crank.

    I pretty much dont know what to do at this point.

    I'm home all afternoon and will be tinkering with it and on here so please post up if you have ideas on to test spark/fuel

  2. stackz

    stackz New Member

    haha, got it.

    I just took off again and got going as fast as I could and then popped the clutch and gave it throttle and next thing I know I'm off!!

    every time I let off the clutch it dies on me.

    how long do you leave the choke in before you take the choke off??

    going to see if the dying problem is idle speed related since it looks to be backed way off.
  3. Mountainman

    Mountainman Active Member

    best at most times to turn off choke asap

    once an engine runs ok without being choked --

    may as well turn choke off so as to avoid -- running too rich -- foul plug ect

    makes it better when we wish to --- Ride That Thing Mountainman
  4. Mountainman

    Mountainman Active Member


    a new one -- are you going to break that engine in -- just a little at least

    simple way -- varying between 1/4 to 3/4 throttle

    when it's broken in right sure is nice to -- Ride That Thing Mountainman
  5. stackz

    stackz New Member

    just got back from running around the neighborhood and um yeah, what kinda brake pads you guys using??? lol, mine are already worn down from just this little run :p

    slowing down from 20-25mpg and still trying to get used to the clutch/brakes.....and cornering!!! lol....

    been **** on the brakes.

    oh yeah, can you guess which of my MANY modifications to the kit is my favorite?? haha. and yeah, I had to do a bunch of fab work so it would fit the tiny frame with thick beams.

    what the **** do you guys do about leg burns??? ugh, I'm gonna heat wrap the exhaust manifold but I've brushed the engine a few times :???:

  6. Mountainman

    Mountainman Active Member

    might wish to try some softer brake pads -- will wear out fasted -- but faster stop

    real hard - usually old brake pads - last a long time - not the best stopping power

    with this brake set up

    I would buy the best pads I could get from a bicycle shop
    telling them that I don't care about how fast they wear out
    I just wish to stop on time

    Ride That Thing Mountainman
  7. POPS

    POPS Member

    Hi Stackz...Nice bike and nice build. I did notice though that your chain looks loose and the idler looks wrong as the chain is wraped too far around the rear sprocket. It is only supposed to cover 50% of the sprocket. Maybe your motor is tilted too far forward.I am shure someone with more experience will help out here as I am just learning as well. What do you think guys ?POPS
  8. Mountainman

    Mountainman Active Member

    good call POPS

    if the idler is moved more towards the engine this will correct this

    some chain lenks out ???

    ride that thing Mountainman
  9. POPS

    POPS Member

    Thanks Mountainman...POPS
  10. hill climber

    hill climber Member

    yep, motor looks a little to tipped forward to me. i try to get the rear mount flush on the frame then file the front to fit. HEY!! DO A WHEELIE! hill climber
  11. stackz

    stackz New Member

    I've had to adjust the tensioner twice today already, the chain just keeps slacking up. after it gets topped out on the tensioner adjustment wise I'll see if there's enough to take another link.

    just kinda weird.

    as for the motor. its flush against both mounts on the frame. I guess its just the chain slowly stretching but you should have seen it when it was first set up. tensioner was almost up against the sprocket.

    but for the life of me I cant see any signs of stretch on the links :confused:
  12. hill climber

    hill climber Member

    you wont see it but its stretchhhhhhhhhhhhhing.
  13. Mountainman

    Mountainman Active Member

    well -- hard to see the stretch with the eye

    if one felt how tight the chain was when new (as we bend it around)

    and then now (notice how loose it feels already) if twisted while in our hands

    cheap chains show this (much faster) than quality chains

    much talk here on site regarding size 41 quality chains

    when the time comes you know what to do ---

    Ride That Thing Mountainman
  14. POPS

    POPS Member

    Another thought???
    Could be excessive chain stretch due to over stressing at rear sprocket. Ex: More than 50% of chain on rear and it's trying to climb itself??? POPS
  15. brendonv

    brendonv Member

    also on ur carby where the throttle goes into the carb u might wanna screw in that bit where it goes into so ur bike idles lower and then adjust the idle with the idle screw if need be.