Bolens 2000 Eliminator Kohler M20 engine

[Bojer]

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 valve guides more than likely should be replaced, too, which brings up this question: since the exhaust valve is made to withstand extreme heat, are the valve guides different too or are they interchangeable? Regards, Bojer

 

[StarTech]

In order to look up parts will need the spec number. also is this the horizontal or vertical engine? I am assuming horizontal as you M20 and not MV20.

 

[Bojer]

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) with the new 30-degree valve and with a new valve seat (30-degree), that is, if the dimensions are the same.
Thanks for your help.