Engine Trouble All the research isn't helping, the SOB will not run!

Discussion in '2-Stroke Engines' started by Zulufoot, Jan 10, 2013.

  1. Zulufoot

    Zulufoot New Member

    OK, so ive done all the research and searched the threads and tried everything but now it started and ran for 2 minutes and died again.

    What ive done so far:-
    2 painstaking days to meticulously mount the motor so it is as solid as a rock'
    Castrol TTS 20:1 fresh 98 grade fuel
    in line filter
    o-ring seal in carby
    carby cleaned (about 5 times now)
    All nuts & bolts double tripple checked for torque
    NGK b6hs plug inserted today and she fired immediately, i pulled in the clutch to try and keep the revs going, it stalled.
    Back to the garage, another new plug (thought it may be destroying plugs, shortened the plug wire and cleaned the carb again
    fired after nearly 199 heart rate and I rode it for 5 minutes dodging all sorts of cars and pedestrians to avoid stopping.
    This thing was laboring, it is spluttering and doesn't want to go (air filter is off at present, tried covering it a little whilst riding but that made it worse.
    So i'm ready to ditch this pos soon, I just cant be stuffed wasting all this time on it when my two perfectly good motorcrossers in the shed could be doing with my TLC, but its my sons bike and he's aching to ride it.
    So all up its run 4 times:-
    3 minutes
    3 minutes
    20 seconds
    5 minutes
    Ive also used 1/2 can of quick start which appears to do nothing really, the floats are set fine, needle & seat clean, clip set 3 from top, so everything is set for it to run, so why isnt it?
    Please help if you can?

  2. keatonx

    keatonx Member

    Sounds like carb. I dont know if HT's have chokes but if they do, use it. Pedal it in choke till it pops, then switch the choke off or half and pedal until it goes. But you ride motocross so you probably know that. But sometimes on my engines if you dont use the choke the carb will not get enough vacuum to properly prime itself, and it will run lean and sputter for a few minutes.
    But if it gets going lean like this (uneven, smooth tone with little power) let it idle untill it settles down. It will probably cut out if you rev it. If the idle sudenly gets smoother and drops rpm while doing this, give it a really quick burst of gas to dump in some fuel.
  3. crassius

    crassius Well-Known Member

    One quick thing to try is to drop your needle to the leanest position and see if it helps, if not, try the richest position. If neither makes a difference, at least you can get back to where you were.
  4. Fabian

    Fabian Well-Known Member

    Oh that's nothing. It's taken me two years to get the engine to run properly and for the rest of the drive train to be reliable.

    Persistence and perseverance is the key to success in this game.

    If you've only been messing about for a couple of weeks trying to get it to run right, you haven't even started down the road to pain and despair as the bike/engine/drive train crushes your spirit and ability to live and function in this world.

    After two years of pain and heart ache, you'll finally achieve some level of reliability - not complete reliability, but a partial level of reliability that from time to time will test your patience and personal fortitude.
  5. BigBlue

    BigBlue Active Member


    AKA: BigBlue
  6. Lunardog

    Lunardog Member

    Sounds to me like its running to rich. Clean the plug, move the clip to the top most position and back your idle screw out 4 or 5 turns. Leave the air filter off and give it a go. You'd be surprised how small an adjustment on these carbs can be the difference between running and not. Good luck.
  7. Zulufoot

    Zulufoot New Member

    OK, took it all apart again last night and put it back together and it started?? nothing different to previously, so I ran the SOB for 15 minutes ****ing the neighbours off no end. got back, set the idling, seemed fine. put the air filter on restarted, tweaked the idling, seemed all good.
    Spent the next 1/2 hr adjusting the clutch cables and levers so it was ready for (big grins)Jr to ride today.
    I noted the fuel was that hot it was bubbling up the fuel line from inside the carby!! so this thing runs HOT.
    Come this morning dead as a dodo!
    stripped it all down again, put a second o-ring inside the carb throat because the connection seems real crap tried clip at top and bottom and shes dead as a dead thing. POS I say. life is too short, the Chinese can stop laughing at me now, they have me beaten with their utter crap.
    What a total waste of time and money, it obviously for a reason I always say...
    Anyway, thanks for the tips and pointer peeps, much appreciated.
  8. Fabian

    Fabian Well-Known Member

    Before you get the gain, you have to go through two years of pain - - - - - - - - - - and - - - - - - - - - - - despair - - - - - - - - - - - and - - - - - - - - - - - endless heartache


    that's the optimistic version of events where it crushes your soul and spirit; causing you to contemplate if life is worth living; knowing that the engine will be waiting to push you over the edge in only 12 hours time.
  9. Fabian

    Fabian Well-Known Member

    I can say that my engine (the very same engine as yours) is perfectly reliable; starts first go and takes me on adventure after adventure, "BUT" i had to endure years of pain and suffering and personal inner torment that (at times) crushed my will to live.
  10. Zulufoot

    Zulufoot New Member

    OK, you have convinced me and judging by the hrs and $ people are spending on these garbage cans, its a full time dedication which i will reserve for my current passion. 2 weeks of my life wasted and I'm calling it, Its to the tip tomorrow.
    thanks peeps, over and out.
  11. Fabian

    Fabian Well-Known Member

    It might be of interest to you that i have extensively ridden dirt bikes for most of my life, with two notable machines being my old air cooled 1984 KX 500 and my CR 500. Both were a lot of fun to ride but nothing is as much fun to ride as my motorized bicycle.

    All of my dirt bikes have been sold and my 1000cc sports bike is being sold next month, because i no longer use it, for the reason that the motorized bicycle is just miles and miles ahead of my dirt and road bikes in the fun and enjoyment department.

    Hang on a bit, i'm trying to multi-task; typing away and at the same time, planning my next adventure on the motorized pushbike.
  12. Fabian

    Fabian Well-Known Member

    Oh yes, it is a full time dedication; sometimes even more: my last girlfriend said "quote - it's me or that d.a.m.n bicycle".

    I am happy to say that i still have my motorized pushbike, now with even more accessories than my ex-girlfiend would ever allow :grin5:
  13. Fabian

    Fabian Well-Known Member

    Where did you say that tip was located: time to find me a bargain that will be up and running in 5 minutes flat :banana:
  14. V 35

    V 35 Member

    Have you checked the CDI box for spark when it fails ? No spark can appear as a carb problem . I'd try another CDI box
    before badmouthing anything else. At least a replacement carb is under $ 20 ditto for black box. What other motorsport
    has parts * that * cheap ?
  15. jaguar

    jaguar Well-Known Member

    the chinese carb should go right to the garbage can, never even tried. Put a Dellorto on it.
    also check the tightness of the screws holding the stator coil on. loose connection there means a bad ground connection for the CDI (which is also inexcusably crap).
    complicating things further is that the crank seals can leak even though new. sometimes they are installed crooked. luckily a jewelers screwdriver can be used to pry them out and a new one can be pressed in with your fingers. Best ones are from Rock Solid Engines.
  16. Fabian

    Fabian Well-Known Member

    C'mon people, don't give too much good advise. I want to pick me up a free motorized bicycle at the tip, and get it home and have it running in 5 minutes flat.

    What happened to the communal spirit we share around here.

    A freeby is a freeby in anyones terms - just got to find that tip...
  17. rawly old

    rawly old Member

    I feel for ya Zulu. I've been the route. I hear a lot of "my chinese
    engine runs great.", but somehow I ain't feeling it. My advice is save
    your shekels & buy a good Japanese engine, i.e. Tanaka, Honda, or
    Subaru. I've never gone thru the hassles I had with the chinese engines
    with my Tanaka PF4000 or my Honda GX35. Both engines have been
    totally reliable right out of the box without the seemingly endless need for
    coddling & tweaking.
  18. Zulufoot

    Zulufoot New Member

    Couldn't sleep last night trying to work out why this thing wont start, it has to start!

    Yep tried that thx mate, it has a good spark, i soldered the connectors earlier in the week because I figured they might be the problem. Where is the best place to get these parts? I see a lot of places advertise?

    Good advice perhaps, I broke one of the fingers off the carby collar this am whilst trying a different clamp, so if i need to get a new carb, may as well get a Dellorto.
    Again, any advise on where to get one, plus a CDI?
  19. Fabian

    Fabian Well-Known Member

    You are only halfway there Zulu.

    When you get serious about problem solving, you'll wake up at 3am; carefully sneaking out of bed (desperately trying not to wake up the girlfriend/wife) and head straight for the shed/garage and start pulling things apart and reassembling the whole kit and kaboodle, then quietly pushing the bike to the next street with your miners light attached to your head to begin testing the engine by revving the rings out of it at 4:30am.
  20. Fabian

    Fabian Well-Known Member

    The only CDI you should be purchasing is the Jaguar CDI. You can get it from JN Motors