You might go with 10W40 but no heavier, you'll blow it that much faster. If it were mine I'd stick with the 10W30 winter and 30W in the summer and just keep adding the oil. Synthetic might help - I doubt it will hurt. Oil is cheap compared to the cost of rebuilding this engine.
The KT17 is a real POS (even the series II) compared to the older single cylinder K321 or K341. You'll think twice before rebuilding it, to do a decent job you are looking at several hundred dollars - a lot of people get into the $600 range and higher (some times much higher) which in my opinion is obscene for what these engines are. I used to think I wanted a red Cub 782 but after reading the issues people have and seeing the costs associated with getting one running I decided I'd stick with my 1450. Decent rebuilds on the older K series are in the $120 to $190 range - including machine shop.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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