HELP!air leak?

Discussion in '2-Stroke Engines' started by spunout, May 5, 2007.

  1. spunout

    spunout Member

    keep in mind, i just ride these and have someone else do the work :???: . but today i put on a new motor/carb, and it runs like doggy-doo :x . wont idle, wont generate any power to speak of, and have to keep the choke up quite a bit. air leak? what do you guys use to seal...silicone? plumbers dope?
     

  2. azbill

    azbill Active Member

  3. spunout

    spunout Member

    k. thanx bill. ill try it
     
  4. spunout

    spunout Member

    air leak?

    :x CRAP!I dont get it... :? i put a perfect-fiiting o-ring in place, and siliconed the outer part of manifold, the intake manifold and everything else is tight, yet it still dogs-out and wont idle. :cry:
    there isnt much to do to adjust carb other than needle clip placement, which my other two carbs are set on the second and work fine.
    any suggestions?
    dang it to heck...put another carb on, and STILL no better :x
     
  5. gone_fishin

    gone_fishin Guest

    this sounds like (maybe) a gasket problem...intake, head, or lower jug...have you had a close look at 'em? the headbolts on mine were plenty tight when i discovered my lower gasket was shot. also, pull the plug and let's see how that looks, too. just some out-loud thoughts for ya...keep us posted.
     
  6. spunout

    spunout Member

    air leak?

    since its a brand new motor, i dont really know what to look for
     
  7. Guest

    Guest Guest

    You can start by removing the manifold and make a new gasket, or at least use some of your silicone and put some on both sides, then tighten it till it's just snug, then after a half hour tighten it the rest of the way.

    Try a NEW plug...these Chinese plugs are not good, even new ones are not always good.
     
  8. spunout

    spunout Member

    air leak?

    thanks for your input, guys. *SIGH!* i did what you guys said, and still it runs all poopie. i think i'll volunteer my one day off a week to work w/spookytooth's wrench, fred. help him out and help me to learn these things at the same time. :p
     
  9. azbill

    azbill Active Member

    good idea happy, learn what you can, then you will be able to fix your own stuff and maybe make some coin helping others :D :D :D
     
  10. I won't recommend it because I guess its a fire hazard if your not careful but I use carb cleaner to find leaks. I spray a small amount around where it could be leaking (like where the carb meets the intake or the intake connection to the cylinder). When the engine sucks the cleaner through the air leak the rpm will change. Then cut the engine off and let the cleaner evaporate and fix your problem.
     
  11. spunout

    spunout Member

    air leaks?

    ok. just talked to spookytooth's wrench, fred, and he says that alot of newer engines have been running into these problems like mine, and the fixes are these: set the needle clip to the third position down (which i did, and runs quite a bit better, but not perfect yet)and copper-coat the head gasket, and torque the head back on at 10-15 ft-lbs. once i do the last part, i'll post the results.
     
  12. ibeenjammin

    ibeenjammin Guest

    Has any of this helped??? I am looking for insight to why my bike is running soo poopie as well. I haven't checked the lower jug gasket yet. if you spray carb cleaner where you think the leak may be coming from and the RPM's change, does it go up, or does it go down? Is it safe to spray carb cleaner on a running motor?

    Ben
     
  13. Guest

    Guest Guest

    Depends what you spray, but it will definitely change the way it sounds/runs.

    Spary away, just don't get the engine too hot before you spray.
     
  14. spunout

    spunout Member

    :!: Oh crud, Ben...i totally forgot to update this thread :/ . Here's the deal w/that-
    I set the idle high, and sprayed brake wash all over that motor, and revs neither went up or down. Gave the motor to a wrench, and it drove him bonkers :x too, trying to find the 'point of suck'. Here's what he did (this is second-hand info...i wasn't there). He says the spark plug threads on top of jug match up perfectly with regular air hose fittings. Screwed the hose into spark plug hole at top of jug , set PSI between 30-40lbs, took off magneto and clutch covers, and found the leak. A magneto bolt-hole? maybe? was drilled too deep at the factory :eek: .
    The air pressure will push the piston down, and you have to put your finger over the bottom of muffler.
    On a different motor when I sprayed brake cleaner, even at high idle, the motor died everytime i hit the bottom jug gasket and carb/intake connection. That motor is sitting in a box until i decide to play w/it
     
  15. thatsdax

    thatsdax Guest

    wow !!!

    The Factory drilled too deep? Leak in the lower end? wow !! I am not sure I would have every figured that one out. It would seem that if they did drill to far, once you put a bolt in that drilled and tapped hole it would have sealed it well enough not to cause such a problem. But..Non the less. An interesting find for sure. Still not sure how it could leak with the mounting bolt in the drilled hole. O well.. Enjoy the ride...
     
  16. spunout

    spunout Member

    I dont know, Dax. like i said, i wasnt there, and didnt get it shown to me. Call SpookyT. he can explain it 8) 8)
    And i think its a cool little diagnostic tool...using the air hose into the sparkplug threads
     
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