Most of my small engines are OLD. Some of them have nearly 200 pounds of compression---Stihl 200t has 185# Not exactly considered low compression.
You are correct in that I probably don't need 91 or 93 but where I buy gas, 87 and 89 have ethanol and I certainly don't need that!
From experience, I have decided that todays gasoline is not formulated for yesterdays engines! Older automobiles with higher compression, run much better with 91 or 93 although most people will use 86 or 89 and live with it.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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