1972 Kawasaki G4TR Trail Boss

Discussion in '2 smokers' started by kenlake, Mar 21, 2018.

  1. Foot dragger

    Foot dragger singletracker

    Joined:
    Dec 27, 2006
    Oddometer:
    26,617
    Location:
    chico,just below rag dump(nor-cal)
    I never thought I would make it past 30 years old. The all wild all the time lifestyle seemed fun,I lived through it and here I am. 61 years old still dirt riding.
    #21
  2. bultacobill

    bultacobill Long timer

    Joined:
    Feb 26, 2014
    Oddometer:
    1,044
    Location:
    Dawson PA
    So a friend dropped a bike off for me to fix. A 1973 Kawasaki 250 F11. I thought you guys might be of some help. I haven’t worked on a 2 stroke for a while and I’m unfamiliar with the rotary valve setup. Seems this bike has zero compression. Before I pull the cylinder to see if it’s a piston issue is there a chance this might be a rotary valve stuck open?
    #22
  3. aptbldr

    aptbldr easy rider

    Joined:
    Apr 20, 2009
    Oddometer:
    1,578
    Location:
    Upstate South Carolina, USA
    The rotary valve doesn't impact compression above the piston.
    #23
    bultacobill likes this.
  4. bultacobill

    bultacobill Long timer

    Joined:
    Feb 26, 2014
    Oddometer:
    1,044
    Location:
    Dawson PA
    Thanks for the reply. I’m not pulling it apart. It’s a piston then and this guy doesn’t want to put any money into it.
    #24
  5. aptbldr

    aptbldr easy rider

    Joined:
    Apr 20, 2009
    Oddometer:
    1,578
    Location:
    Upstate South Carolina, USA
    Wait. I didn't think it thru. If the valve were stuck closed, the piston would starve to refill and create full compression.
    You can look thru the carb to see if valve spins the with crankshaft.
    #25