Maybe Stephen knows? He's inside the engine quite a bit these days. _________________ MC21SP Plaything
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MC21 and MC28 cylinders (barrels) can be interchanged, as can pistons and rings. I believe the MC28 has (very) slightly milder porting than the MC21, but I need to get my hands on a barrel to make a port-map to confirm this for sure.
Looking at the power delivery graph of a stock MC28 would certainly lead one to assume the ports were just a little more conservative.
Differences between part numbers on the MC21/28 pistons and/or rings is often just Honda updating (superseding) the older part numbers. Simply order MC28 pistons/rings for the MC21. _________________ Andy.
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Or maybe just 'The barrel' _________________ MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball
lol I can think of worse than Andy "the tool" for you Andy, Oh where are the pictures when I need them. _________________ If I have to take the carbs off once more...
The barrels are interchangeable, but you shouldn't mix 21 and 28 barrels. The port heights are different, but can't remember which is which.....there you go, a quality vague answer.
Don't try that one on me Wayne... not now that you've seen the light and started trying to convert your MC18 into an MC21!! _________________ Andy.
NSR-WORLD.COM
Please keep all responses to Forum posts on the Forum so that others may benefit.
Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.
Wayne, Andys just going for ya because he knows your little stock mc18 with a set of cans would whoop his ti canned all hrc trciked up to the max 58bhp MC twentyalmostfastone NSR _________________ If I have to take the carbs off once more...
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