Something i have to ask guys!i heard rumors that mc18s barrels and heads can be fitted to the mc21 without modifications and work normally!

Yes they can, but go for 1988s , rumour has it that the early cylinders were more powerfull as they were made before the restrictive japanese mc laws passed in 1989
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Poul
"If Life Gets Boring, Risk It!"
MC21SE, KISS box
MC21SP, HRC box, racing loom