Engine size?



wheelbender6

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Nov 13, 2008
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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.
 

HeadSmess

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May 17, 2010
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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?"
 

wheelbender6

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

KCvale

In memory of KCvale 1959-2019
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Apr 18, 2010
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How do I find out what cc my engine is?
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).
 
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