Just got my replacement cylinder today, so was hoping to have the bike ready for the weekend's racing. Anyway, the cylinder arrives and despite not being really clean, and the base face being scratched to sh*t .... the thing has been ported (mostly exhaust side). My other cylinder has not been ported.

Should I
(A) Stick it in, should be fine if the jetting is OK.
(B) Put it in temporarily until I can get the old one fixed. If it blows it blows.
(C) Port the the other one so that they match each other. Ulp!

J

And if (A) or (B), should it go in the top or the bottom?
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MC28 SE -sold-
MC21 with RS250 engine -for sale-
MC21 race bike -soon for sale-