The "kit" HRC transmission will fit stock cases, but as Dan says is rare. I have 3 (two dry & one wet clutch), one for each bike, and a spare with full options that will probably go in the F250 at some point once it can be justified. It's taken over 5 years to source them, and even then the full kit with options needed a new primary shaft to be sourced as it was missing. (Couldn't believe my luck when a new one came up on Yahoo! for £40!)

The HRC transmission is undercut. The HRC MC28 transmission upgrade is an MC21 selector cam and spring, which helps prevent the jumping out of gear. Generally the NSR transmission is very good, based heavily on the RS250 but obviously with cheaper mass manufacturing processes, so of course not as strong/tight.

Matt@TYGA says he busted a few, but he was winning championships -- I've never heard of people breaking them without being overly unsympathetic otherwise. Steve ran 70+hp through his wet clutch R transmission on his 300 and never had a problem.

I never used the clutch on upshifts with my standard MC21SE 'box, and that was still 100% when I replaced it with the HRC transmission last year.
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Andy.
NSR-WORLD.COM

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