4 Stroking when and how?

Discussion in 'Motorized Bicycle Trouble Shooting' started by motortime, Apr 8, 2017.

  1. motortime

    motortime Member

    Joined:
    Dec 26, 2016
    Messages:
    32
    Likes Received:
    0
    I wonder what 4 stroking really means. Can someone give an explanation of that, a video would be much appreciated if there is.

    Cheers!

    pino. (<-- haha cool that there's a Philippine flag as well)
     
  2. TheNecromancer13

    Joined:
    Jan 21, 2015
    Messages:
    603
    Likes Received:
    10
    So normally, a 2 stroke engine fires after every upstroke of the piston, but when it is 4 stroking, which is caused by overly rich air fuel mixture, it fires every other upstroke, or even less often, resulting in a significant loss of power and increase in noise. If you like I can make a video of a bike when it is 2 stroking vs 4 stroking, I have one right now that 4 strokes at high rpms and I haven't gotten around to redrilling the main jet yet.
     
  3. Agreen

    Agreen Member

    Joined:
    Feb 10, 2013
    Messages:
    786
    Likes Received:
    1
  4. crassius

    crassius Well-Known Member

    Joined:
    Sep 30, 2012
    Messages:
    3,379
    Likes Received:
    35
  5. Slogger

    Slogger Member

    Joined:
    Sep 8, 2014
    Messages:
    545
    Likes Received:
    3
    Four stroke power pulses put high stress on your seals, they say.
    Two strokes were designed to two stroke, four stroking is a cry for help.
    Lean er out some. The difference in smoothness and power are worth the trouble.
     

Share This Page