The symptoms can be similar for the MC16 and MC18 R2/4J MkI, but are notably rarer, even though they are older models. The 1987 and 1988 centre seals are of similar design, but are different in size.

There's a replacement offered by T2 Racing for the 1988 MC18, but no known replacement for the MC16 seal [with the correct speed rating and construction] that I know of.
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Andy.
NSR-WORLD.COM

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