I have done some research on this myself and I have not found an answer to this question. The best i can come up with is as follows from the web site below.
Why are John Deere tractors green and yellow? No one really knows. The earliest color illustration of Deere equipment with the green and yellow color scheme is of a Deere sulky plow in the 1905 Deere & Webber catalog. There are probably earlier implements painted in this color scheme, but we haven't been able to verify that.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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