cylinders
a-large
b-medium
c-small
pistons
d-small
but what letters are medium and
large as i dont want to assume
is ti c-medium b-large
i got some barrels of the guy i got my bike of and they are c barrels but when i looked at them they both have small cracks between powervalve ports
so now know that the spare pistons i have are for c barrels and want to fit them into my b barrels till i know [and can afford] new pistons etc,,,
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NSR250 MC18