In hard ground that has never been worked, 10 HP per foot is the general rule of thumb for a heavy duty tiller. It's better to have some reserve power than over work the tractor and all the PTO components. A 6 foot is a good size for a 255 but it won't cover both back tires. A lot depends on the type of ground to be tilled. Having a little smaller tiller gives you something that will work in most all conditions rather than only in previously worked ground. It also depends on how deep you go. I have a 66 inch on my 135 and in hard clay type soil it is all that it can handle with multi-power in low in first gear. Dave
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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