125 cc questions

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I've noticed that the 125 cc motorcycle engines have a high hp rating given their small displacement .ie 9-11 hp.
the equivelent stationary motor would be around 300 cc.
Is this just because they revv much higher, or Is the compression higher.
How does a 125 cc semi-auto compare in terms of perfomance to say a stationary motor of equivelent hp.
I'm asking this because I am using a 125 in a buggy project
 
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