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My Kohler M20 is horizontal. Model # M20QS, Spec # 49508. The exhaust valve stem minimum OD is .3088. The actual X stem mic'd at .308. I'm hoping, that by replacing the valve guide, it will minimize the stem play but maybe not. Another idea: replace the existing exhaust valves (40-degree)...

I am working on my Bolens Kohler Magnum M20 engine. My Kohler is the early version and there appears to be a scarcity of engine parts. Does anybody know of any available OEM valves (45-degree)? The exhaust valve stems/guides have too much play and the valve stems spec at bare OD minimum. The...