A delimited, good condition well set up MC18 or MC21 compared to a similarly set VJ21 or VJ22, generally makes a couple more peak HP, but as Racer38 says, the spread of power is a lot wider. The narrow powerband of the RGV is what makes them feel deceptively fast, and consequently, the NSR deceptively slower.

The following were all run on the same dyno. The numbers are unimportant (so it doesn't matter if the dyno is accurate, read high, or read low, as the graphs are all relative!); it's the shape of the graph that matters.

Two well set up, but otherwise untuned NSR's:





Very well cared for RGV250K VJ21 Pepsi edition, comparable to an MC18:



My MC21SE with nothing more than optimised ports (standard shape/sizes), barrels matched to cases, race pipes, and HRC head/jet kit, compared to a ported (barrels and crank cases) and well developed VJ22 race bike with DC valves, Sugaya ignition and Sugaya pipes:





And the two graphs combined:



The 3XV is a far more comparable motor. Like the NSR's design, it is a lot more efficient than the RGV, and very similar in design to the Yamaha GP motors of the same era.
_________________
Andy.
NSR-WORLD.COM

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