Engine size?

Discussion in 'General Questions' started by Shleppin, Feb 6, 2016.

  1. Shleppin

    Shleppin New Member

    How do I find out what cc my engine is?

  2. wheelbender6

    wheelbender6 Well-Known Member

    If you have a China girl, it will not be stamped anywhere on the engine.
    You can use a caliper to measure bore and depth gauge or dial indicator to measure stroke (after removing the head).
    Harbor Freight sells a "Technical Measuring" kit that costs around 10 bucks that will probably do it.
  3. HeadSmess

    HeadSmess Well-Known Member

    now that IS technical!

    piR^2*stroke just too make life really hard. math? wasnt that what we asked at school? "how is this ever going to be relevant in real life?"
    Shleppin likes this.
  4. wheelbender6

    wheelbender6 Well-Known Member

    I used the circle formulas a lot to try to calculate engine rpm at a certain mph after final gear ratio changes.
  5. KCvale

    KCvale Motorized Bicycle Vendor

    It helps to show a picture of the darn thing ;-}

    If it is a 2-stroke meant for motorizing a bike it is either 48cc or a 66cc, there is no such thing as an actual 80cc, that has been marketing crap for years.

    Bore (cylinder with) x Stoke (how far the piston goes up and down).