First Kawasaki upped that ante in 2006 by making the fastest production bike, the ZX-14. Now Kawasaki Ultra 250X is one of the fastest production jet skis in the world! Powered by a supercharged 15,000cc engine this Jet Ski pumps out 250hp with a maximum boost of 11.4psi. All that power gives the 250X a top speed of 70mph. You may be thinking 70mph doesnt sound that fast for the huge supercharged engine on this beast. But remember all personal watercraft manufacturers must limit their top speed based on an agreement with the Coast Guard. So instead of trying to make a screaming death machine on water, Kawasaki opted to beef up acceleration rather than top speed.

[Source: Kawasaki Jet Ski® Ultra® 250X]

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