Louis,
You are correct.
The 454 engine is essentially half of the Ninja 900 (908cc) engine and became the basis for the Ninja 500 motor. Kawasaki increased the stroke a little to get to the 498 cc Ninja engine. The Vulcan 500 and Ninja 500 share the same motor.
Rojo
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'15 RX3 (Rojo's)
'15 RX3 (marzhere's)
'16 TT250
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