Where all the RSs really score, as I've already pointed out, is in the chassis department.
F-III kits were available for the MC16, MC18s, and MC21. Naturally the MC21 is the most comprehensive, and a well prepared and ridden one will hassle an RS (NF5 and NX5) all day long. That said, to achieve RS performance, in the simplest of terms, you are basically turning an NSR into an RS*, and in doing so you will increase its service levels to that of the RS! F-III parts are extremely difficult and expensive to source now, and to buy or build a full-spec one will easily cost as much as buying an NX5 these days.
In my opinion, a better route is to run an MC21 in SS400 spec. Careful preparation will see the bike down to around 115kg and anywhere from 65~70hp, depending on budget and requirements, and will be noticeably cheaper to run and maintain... especially if you are using it as a warm-up/backup bike at track days.
Without question, the MC21 is the all-round best model to run. Best chassis, arguably the best motor, readily available chassis and engine parts, relatively cheap initial purchase price for a base to start from, and easily derestricted with a free wire-splice!
*An MC21 F-III parts book contains an HRC replacement part for virtually every standard NSR part, bar the nuts, bolts, and bearings! Seriously, it's a complete bike from the wheels up! Oh, the fuel tank and seat unit are standard on the MC21!
(I do have an alloy MC18 HRC tank!) _________________
Andy.
NSR-WORLD.COM
Please keep all responses to Forum posts on the Forum so that others may benefit.
Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.
Check us out on Facebook! Please "like" our page!