RobH wrote:
I'm sure Andy will correct me if I've got it wrong but 5K onwards cranks are interchangeable. So 2J/4J cranks are not compatible with 5K onwards

The 90-97 (MC21/MC28) cranks can be machined to fit the 1989 MC18 R5/6K, but the 89 crank can't be used in the later models.

The 87 & 88 cranks have the separate centre seal (similar to the HRC RS250 NF5). The 87 and 88 seals are not the same, and at the moment there is no solution for a 1987 MC16 centre seal failure, however we have successfully used T2's pattern seal for the 88 R2/4J.

The 89-97 cranks have the centre seal integrated into the centre main bearing, and is unquestionably a weak point that I expect is being exacerbated by ethanol content in modern fuels.
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Andy.
NSR-WORLD.COM

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