Some RS parts can be made to fit, but it's really not the way to go, and certainly NOT a quick, cheap, and easy way to power for an NSR. As Les says, it's mostly NF5 parts that you can use, if you really want to.

You are better off having NSR parts modified. 65hp with a really strong mid-range is easily achievable, 70hp is possible (retaining many of the standard parts, if you're willing to pay for the work!), and up to 75hp if you go the full F-III route and want to rebuild it as often as an RS. A 75hp F-III NSR will kick the ass out of an NF5's bottom-end and mid-range though, but the RS does have the potential for a little more top-end, but not by much. The RSs strengths are the hand-built quality, the quality of the cycle parts (the suspension and brakes are wonderful!), and it's low weight. That all adds up to a more superior bike... on the track, in the right hands.

There's very little that makes an NF5 RS250 motor better than an NSR though.
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Andy.
NSR-WORLD.COM

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