Yamaha WaveRunner Superjet 650 Personal Watercraft (1990-1993)

The Yamaha WaveRunner Superjet 650, produced from 1990 to 1993, represents the first generation of Yamaha's stand-up personal watercraft. Affectionately known as the "650 Square Nose," this iconic PWC is powered by a 633cc, 2-stroke, 2-cylinder engine with a Mikuni Super BN44 carburetor. While initially marketed at 50 hp, the original manual indicated an actual output of 42 hp at 5,500 RPM. The 1990-1992 models shared the same 633cc engine with an RPM limiter set at 6500 RPM. In 1993, the model (SJ650R) introduced a siphon-type bilge system and a slightly larger diameter pump exit nozzle, designed to improve thrust. There were no distinct trim levels with varying features during this period. A significant engine upgrade to a 701cc engine did not occur until the 1994 model year, marking the end of the 650cc engine generation. Q: How can I ensure parts compatibility for my Superjet 650?

R: To guarantee compatibility, please use the year and model selector at the top of this page.

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