I just looked at one of my operator manuals for the 1000-1650 Tractors. I know this is a little later than your model, but this one says>
This engine is designed to operate on leaded gasoline with a 93 minimum octane rating or on unleaded gasoline with a 91 minimum octane rating. It goes on to say that the unleaded gas will increase spark plug and valve life, maintain engine performance longer and reduce rust and corrosion of the engine while stored. Publication 8-77.
The Kohler service manual I have which covers engines K91-K341 suggests unleaded gas 87 octane and higher. It goes on to say using leaded gas will require more frequent service on the cylinder head. Publication 4/90
So with that being said have others on this board had better experience with higher octane gas?
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