My 640 went 20 years with out fuel valve leakage.I always opened the valve just 2 turns.Opening more just wears the O ring, you can see the flat spot on leaky O rings.I also found that Marvel Mystery Oil will cause an O ring to swell up and bind the valve up so tight it takes a big screw driver to open or close the valve.After 6 months the valve will open easy because the o ring dissolves.Do not put any MMO in the gas of the 600 or 800 tractors.
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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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