Nikasil coating

texasSlick said:

I would look into nickel plating a bore. The plating thickness can be enough to bring an over bore back to stock. It is expensive, but is a million mile solution.

Slick

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Nickle plating has the greatest tendency to 'double-coat' of any type of plating. Especially if the substrate contains nickel.

I know with two-strokes, some people were fanatical about bore clearance. However that was prior to inlet ports being bridged and piston skirts used to break. I have never worried about bore clearance on a four-stroke. I just fit new piston rings. A loose motor is usually faster. If the motor rattles or misses, it needs to be fixed