Back to Denny's post #11, when the Yamaha's "plasma" cylinders wear down to aluminum that's it.......no rebuilding is possible. That's one of the ways they got the weight down on the 4.2 V-6, no steel sleeves. I know the plasma cylinder is derived from F-1 technology @ 18,000 rpms, however they only have to last 300 miles. Seems like the 4.2 engines have been on the market long enough to have plenty of longevity data available. We'll see how this plays out.
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