The only bike that comes close to the NSR quality-wise is the Yamaha TZR250 3XV, but that's even rarer and most of the parts (especially tune-up parts) are very scarce. I believe there are a number of OEM parts available through UK dealers though, but like I say, spares for all these bikes will start wearing thin soon, and for a JDM model, the NSR is now by far the best supported.

Engineering-wise the NSR is second to none, and anyone with any level of mechanical aptitude can see it when they look inside the motor. NSR's are Honda's at their (late 80's ~ early 90's) best.

On the road there really isn't a great deal between the MC18 and the MC21. In standard trim the MC21 chassis is way ahead of the MC18, but the '18 can be made to work very easily. Both are easy to delimit. Try to go fo an '89 Mk2 (R5K/R6K) if you choose an MC18. It's not hugely better than the Mk1, but some important Mk1 engine parts are extremely difficult to source now, even used.

The MC21 probably gives the best performance-per-pound. You get a more modern, stiffer chassis, better sized wheels, most you will find will have the dry clutch and adjustable suspension, and will usually be in better condition. MC21 forks will slot straight into the MC18 R5K yokes, and a few will have been upgraded with 90~93 SE/SP forks, but it's very rare to find an MC18 with a decent (adjustable) rear shock. Most of the MC21's you will come across on the other hand will be SE models, with full adjustability. An MC21 however, will normally be around double the price of an MC18.

10 minutes with a pair of snips, a soldering iron, and a 20mm flat drill bit will liberate 15~17hp from a stock 45hp '18 or '21.
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Andy.
NSR-WORLD.COM

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