Anyone tried this expansion chamber? Short $$$

Discussion in 'Performance Mods' started by mike burrus, Jun 28, 2016.

  1. mike burrus

    mike burrus Guest

  2. butre

    butre Well-Known Member

    it doesn't do anything. it's not tuned at all.
  3. Frankenstein

    Frankenstein Active Member

    Funny you say so, it works on mine. But mine also was cut and welded in 2 places to make the muffler follow my downtube, the engine ran a bit better before my weld job however.

    It's not exactly a tunable muffler, there are a few that can be customized to fit YOUR engine's needs, I got lucky maybe, maybe it's all in my head too. Old phrase comes to mind, when in doubt, do without.

    Good luck, I will say however I've been dealing almost exclusively with bicycle motor works since I started diving into the motorized bicycle pool, never had a single thing to complain about him, very trustworthy.

    Edit: I will also mention the baffle on the end of it is practically an empty tube, it seems to work, being I broke mine off in a fit of rage, and now it's much louder, the open space leaves lots of room to customize your mufflering needs, pack it with lots of pot scrubbers and it couldn't be heard more than 10 feet away, yank the baffle off and you'll be heard 4 blocks away.
    AutOtaku likes this.
  4. butre

    butre Well-Known Member

    try a real expansion chamber before you comment. currently you just don't know any better.
  5. Frankenstein

    Frankenstein Active Member

    You couldn't possibly know what I do or don't know, I've only been on this site for a few days at most.

    Ask me what I've seen and felt in my engine during its operation with this exhaust, vs with a stock, vs stock rewelded to have a longer and curved tube between the engine and baffle, vs it with pot scrubbers in it, vs with holes drilled into the baffle, vs what it sounded and felt like before the Reed valve, port timing change, carburetor adjustments, vs the same but with a stock, and a different brand expansion chamber, vs what it is now. *changes if going up vs down a hill.

    Did you might think that, out of pure chance that muffler ended up on my bike? Perhaps because the guy who sells it lives practically next door to me, sister cities, that's why I choose to bend it and weld it to fit in a few different styles on 2 different bikes.

    No maybe it's because it works for me, which I determined because of what I do know, and not by ignorance. Ass hole. :)
  6. butre

    butre Well-Known Member

    sorry if I come off like an ass but I've gone over this a thousand times with every newbie for the past few years. I can count the number of real tuned pipes designed for a china girl on one hand, and this isn't one of them. I've tested every pipe available for this engine and I can tel you that this is no different than just an extended stock header. it's not tuned for this engine.
  7. Frankenstein

    Frankenstein Active Member

    Probably not out of the box, I figured it out by obstructing gas flow at each end, while changing the length. Figured it out by mistake while trying to adopt this muffler design into mine, to make it quiet but streamlined.
  8. Frankenstein

    Frankenstein Active Member

    Useful for using bike through water too, apparently as a side result of engineering, which I've done a few times. (if you ride it in the rain why not a foot of water?)
  9. AutOtaku

    AutOtaku Member

    Had my baffle fall off while riding and it suddenly got VERY loud XD
  10. 45u

    45u Active Member

    This is the one recommended to me to be able to buy and not have to fabricate. Good chance I will have to put a silencer on it.