The Yamaha Spark 135i is a small underbone bodied motorcycle which is also the motorcycle with the second-largest displacement in its class. The Yamaha Spark 135i is powered by a SOHC 4-valve 4-stroke liquid-cooled forward-inclined single DiASil cylinder 134.9cc engine. With a 54mm bore and 58.7mm stroke, producing a compression ratio of 10.9:1. Yamaha uses for the Spark 135 a Die-cast aluminum cylinder (DiASil), which offers better heat conductance to dissipate excessive heat more easily. The light forged piston can normally be found in high performance race engines.
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