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Originally Posted by mrlmd1
I've had innumerable cars over the years, and some "high powered, high performance" sports cars, foreign and domestic, and don't ever recall having a valve adjustment on any of them. Other than a little higher revs, what's the difference between a bike and car as far as this goes?
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All of those cars probably had self-adjusting, hydralic valve lifters. Some bikes do too but not many.
Not only do the valve seats wear but so do the seating surfaces of the valve itself, the end of the valve stem, the lifter (if any) and the cam lobes.