Exhaust exhaust muffler broke off, safe to ride?

Discussion in '2-Stroke Engines' started by jatgm1, Aug 31, 2016.

  1. jatgm1

    jatgm1 Member

    i was riding my bike today and the exhaust, the original chrome one with the end that can unscrew, its muffler litterally just broke off. can i ride it like this?

    Attached Files:

  2. jatgm1

    jatgm1 Member

    by like this, i mean can i pull off the muffler and just ride it, i mean, i dont care how loud it is, the question is will it damage my engine.
  3. Frankfort MB's

    Frankfort MB's Well-Known Member

    You can ride it like that but it's not going to have any power.

    2strokes need back pressure to run right
  4. crassius

    crassius Well-Known Member

    I like to have at least 6 inches or so of pipe to keep cold air from being sucked onto hot piston crown - you should be OK if that much is left.
  5. jatgm1

    jatgm1 Member

    could i just bend the pipe or something for now to give it enough back pressure to run?
  6. jatgm1

    jatgm1 Member

    the entire metal pipe is there, just the muffler fell off. take a look at the picture.
  7. crassius

    crassius Well-Known Member

    wasn't sure if pic was before or after : )

    start it up & see how it runs
  8. jatgm1

    jatgm1 Member

    what would indicate a problem that could be damaging to the engine?
  9. crassius

    crassius Well-Known Member

    I wouldn't expect motor damage, but speed may be less and neighbors may complain. (speed *might* be greater depending on tune of the engine)
  10. butre

    butre Well-Known Member

    your engine will be fine, your ears might not be. for your own sanity I'd suggest replacing it. good opportunity to buy an expansion chamber exhaust for it
    Frankfort MB's likes this.
  11. jatgm1

    jatgm1 Member

    im actually ahead of you. i got the one from sick bike parts. looks fantastic. until then i guess itll sound like someones opening fire with a sub machine gun.
  12. jatgm1

    jatgm1 Member

    just tested it out, hauls a$$. loud as hell though.
  13. Ahmad Darwish

    Ahmad Darwish New Member

    No don't ride it, just buy a new muffler or expansion chamber, you won't have any back pressure and you will burn out a piston because of the air coming in.
  14. jatgm1

    jatgm1 Member

    good thing im not riding it. the expansion chamber will be here on tuesday.
  15. Frankfort MB's

    Frankfort MB's Well-Known Member

    You must have not been around these things long.....
    You don't have to have back pressure too run. They just don't have any power.

    Answer this, how is air supposed to get in if he still has exhaust?
  16. skyash

    skyash Active Member

    I don't get the back pressure thing me and everyone i know runs little to no back pressure on 1inc long pipe no mufflers thats it and are bikes fly we seem to think its better not for my ears lol.but twice the take off all the way to top speed of 65kmh 67kmh then if i add some back pressure i get 2or 3kmh more .eny restrictions /back pressure means slower air escaping and slower performance. But some say a tuned pipe will work wonders just hasn't worked for me .
    Frankfort MB's likes this.
  17. butre

    butre Well-Known Member

    if a tuned pipe hasn't worked for you, you haven't had a tuned pipe. most of the pipes you can buy for these motors aren't tuned pipes even if they say they are. I've run the short open header (I went 3 inches of 1.25 inch pipe with a slash cut turndown) and while it was an improvement over an untuned pipe using a tuned pipe gave me all that low end torque and more top speed.

    you're right that back pressure isn't what you want, but rather ideally you would have tuned exhaust pulses.
  18. KCvale

    KCvale Motorized Bicycle Vendor

    A 2-stroke engine has no valves a like a 4-stroke.
    It tries to do intake and exhaust at the same time and your intake starts going out the exhaust.

    Just follow the green fresh air/fuel/oil mixture.


    The stock mufflers provide some good back pressure, a tuned expansion chamber just more, like a reverse turbo charger.
    All that gas/oil mix you have on your bike/driveway/etc. is power you paid for, and literally left on the road with no gain.

    The SBP X-chamber is difficult to install, but very flexible in it's configurations.
    It is tuned to go one 'as is' for a 48cc engine as they are legal most places and need some help making more power.
    For a 66cc I just cut that ~4" straight piece of copper in half for the perfect tune.

    Throw in an NGK 7544 (CR7HIX) Iridium spark plug in to ignite all that extra fuel and you will feel all that extra power right away ;-}

    Hope that helps ya ;-}
  19. DuctTapedGoat

    DuctTapedGoat Active Member

    Welcome to the club, everyone should have one of these. It's a nice emergency pipe. Install a muffler and call it good, muffler keeps the humidity out of your system.
  20. Pig

    Pig Guest

    You can ride it for a little bit, but it better that you don't because you have the risk of burning out a piston...also you will have a significant power loss, if it still runs, due to lack of back pressure. If you have the 4 stroke kit, you really aren't at too much of a risk.