What are the different motorcycle engine configurations?

Answer

Here are the most common engine configurations as summarized in Timberwoof's Motorcycle FAQ.

• Single: Called a �thumper.� Most dirt bikes, many small motorcycles, and the BMW F650.

• Inline Twin: two pistons side by side.

• V-twin: Harley Davidsons, Ducatis, Honda Hawk and Superhawk, Moto Guzzi, and a couple of Suzukis including the wonderful SV650. The 90-degree twin is very well balanced; other angles may or may not be, depending on whether the crankshaft has one pin or two.

• Flat-twin: classic BMW design offers good balance and natural air-cooling.

• Inline-three: Three pistons in a line. Typical examples are Triumph and BMW K75.

• Inline-four: Staple of the UJM or "Universal Japanese Motorcycle," found in everything from the 400cc Honda CB-1 to the 1200CC BMW K1200. In the UJM it's mounted with the crankshaft sideways; in the BMW K it's mounted with the crankshaft aimed north-south and the pistons off to the left.

• V-four: Honda VFR 800 (sideways) and ST1300 (longitudinal): smooth like a four and balanced like a twin.

• Flat-six: Honda Gold Wing and Valkyrie: smooth torque monster with low center of gravity.

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