Basically what happens is the ex valve gets carboned up, maybe a little rust too and it sticks. You can usually lube them back into operating condition, but sometimes you have to pull the valve and ream or otherwise get the carbon out of the guide and off the stem. Running a little ATF or Marvel in the fuel will help some and so will making sure the timing is on and the carb isn't running rich. Considering the age of most of these engines, the Gravely design is remarkable for what it is.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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