what size cc now

Discussion in 'Heads and Cylinders' started by chmn22s, Sep 24, 2018.

  1. chmn22s

    chmn22s New Member

    Joined:
    Jun 8, 2017
    Messages:
    18
    Likes Received:
    1
    My buddy got a replacement cylinder for 49cc China girl engine but the original piston and rings is too small but it came with a piston and rings that's fit it. It's not 40mm, and it's not 47mm (66/80cc). we measured it at 42.7mm. I think I can get a pic, but it looks just like every China bike engine and fits over engine studs fine also stock head fits it but new bottom gaskets are a hair too small. What now is the engine size in cc? Is this ever heard of?
     
  2. Venice Motor Bikes

    Venice Motor Bikes Custom Builder / Dealer/Los Angeles

    Joined:
    Mar 20, 2008
    Messages:
    6,309
    Likes Received:
    50
    You also have to know what stroke size the crank is to get a total displacement

    If you have a 38mm crank?, you'll have a 54.4cc engine
    If you have a 40mm crank?, you'll have a 57.2cc engine
     
    #2 Venice Motor Bikes, Sep 24, 2018
    Last edited: Sep 24, 2018
  3. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

    Joined:
    Jul 28, 2010
    Messages:
    5,830
    Likes Received:
    62
    48cc are only made in 38 mm stroke.
    Engines are made in 48cc 55cc 60cc 66cc 69cc
     

Share This Page