Square? I thought pistons were round? All of these are a little confusing for the uninitiated (which includes me generally in life), so I’m putting together a simple guide explaining what I’ve learned. In addition, sometimes I see terminology like “oversquare” or “long stroke”. ![]() The reality is that bore and stroke mentioned for a reason - to help you understand how the motorcycle’s engine gets that displacement, and to compare those figures to other bikes in the same class (or even series, as the manufacturer develops the engine). “Why should I care about the dimensions of the inside of a motorcycle? All I care about its displacement, baby!” “What are these mystical figures?” I used to think. Frequently when looking up motorcycle specs, you see engine displacement along with bore and stroke.
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