Exhaust Exhaust Manifold?

Discussion in '2-Stroke Engines' started by geebt48cc, Dec 25, 2012.

  1. geebt48cc

    geebt48cc Member

    Hey folks,

    Well, I got the JNmotors exhaust manifold extension today as a gift?!~ Well, just wonder if I'll notice any change? I've heard from some friends that they really don't do much? Hmmmmmm, anyway, I'm going to give it a try.............Why not!

  2. Purple Haze

    Purple Haze Active Member

    I thought about trying that, also... let us know how it turns out. I don't think any one mod would make a huge difference on these little engines, but 1/2 horsepower here and there add up, plus an exhaust improvement sets the table for intake improvements later.
  3. geebt48cc

    geebt48cc Member

    Hey there Purple,

    Yeah, I've got it on bike now, but can't use yet do to weather. LoL, it does help the engine look more official?! Time will tell.............
  4. jaguar

    jaguar Well-Known Member

    With an expansion chamber it lowers the peak "tuned" rpm of the engine by 400 so that the powerband is that much lower.
  5. geebt48cc

    geebt48cc Member

    Exhaust Manifold

    Ummm, See, here manifold on bike. Like I said, haven't tried yeah do to weather. Had to grind top vent levers to get to fit flush do to milled head, and not using head gasket.

    Attached Files:

  6. HeadSmess

    HeadSmess Well-Known Member

    cant agree more. what a pointless item. someones making money at least :)
  7. sublunacy

    sublunacy New Member

    is that zinc chromte paint? nice one
  8. Fabian

    Fabian Well-Known Member

    The exhaust extension is a handy way of moving the exhaust pipe further away from a large diameter down tube; giving more air gap between the pipe and bicycle frame, especially if it's made out of thin wall aluminium tubing.
  9. Leroybrown420

    Leroybrown420 Member

    I use them all the time for clearance reasons. I don't know if they do much. 20130822_173335.jpg 032.jpg

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  10. Leroybrown420

    Leroybrown420 Member