1. 2 Stroke Husqvarna Motorcycles Made In Italy - About 1989 to 2014
     WR = 2st Enduro & CR = 2st Cross

All 2st TMXX bowl nut porting

Discussion in '2 Stroke' started by montgob1, May 24, 2011.

  1. montgob1 Husqvarna
    A Class

    All my VM mikuni, TM mikuni, all 3 Keihin PWK's and my PWM carb have small holes in the bowl nut, and small holes in the threaded boss at the bottom of the bowl to allow fuel into the bowl nut from the lowest level in the bowl. The TMXX on my CR has the holes in the bowl, and the nut has a small area between the threads and the oring where the holes would be, but there are no holes in it? Just wondering if anyone knew of the reason? Seems you would want to be able to use all the fuel in the bowl, and the threaded boss sits up quite a bit off the bottom of th e bowl?
    montgob1, May 24, 2011
    #1

  2. Twatty Husqvarna
    AA Class

    Location:
    Adelaide, Australia
    Just guessing here, but,
    Maybe it's just to allow any crud in the fuel to settle there rather than feed it into the engine?
    Twatty, May 24, 2011
    #2

  3. Motosportz CH Sponsor

    Location:
    Vancouver WA
    Husqvarna Motorcycle:
    2021 TE250i, 570 Berg, 500 KTM, 790R
    Other Motorcycles:
    many
    Joe Chod here swears by drilling the holes and says it stops the fuel starvation when WFO on the 125. He has a lot of time on the 125 so I'm guessing he is on to something. Try it.
    Motosportz, May 25, 2011
    #3