1988 R2/4J heads will fit, and you may get away with an 1987 MC16 head, although it will take a little creative plumbing as the outlet differs to the MC18.
Using an MC16 head may also effect the compression ratio.
Only 87-89 heads share the same patterns. No other models share heads with NSR250s. _________________ Andy.
NSR-WORLD.COM
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Mate, if I'd have known I'd have told you to pop down to Aintree, I had a head in my spares kit today! _________________ More **** two strokes than you can shake a **** stick at.
i agree that the mc16 head probably will alter the compression ratio seeing as the mc16 engine runs a lower compression figure and i expect the squish area/angle is different also?
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