You won't need to if the motor is in good shape. The MC18 (both Mk1 and Mk2) will fair old fly along with the ignition delimited and some holes in the airbox lid... ask anyone who chased nsr.wayne at Llandow last weekend!

StephenRC45's MC18 R5K jumped from 45hp to 61hp with those modifications. I'm sure he'll post a graph of it soon enough.
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Andy.
NSR-WORLD.COM

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