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…..Yamaha Apex (150 FI) models feature a sleeveless plated cylinder design, where the previous carbureted RX-1 engine had plated cylinders with sleeves. The change...

…..Yamaha Apex (150 FI) models feature a sleeveless plated cylinder design, where the previous carbureted RX-1 engine had plated cylinders with sleeves. The change is said to improve heat displacement on the higher-powered fuel-injection engine. In addition, the FI version has an oil pressure sensor. The pistons and rings (and connecting rods), however, are the same as the 2005 carbed models.

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