Mark, My choices are limited to shell and marathon. I use marathon. Shell is a greater distance. I'm going to continue my ethanol experiment, marathon gas hasn't worked in the past 6 years. Ethanol is working.
In the winter, my Jubilee carb has to be richened by two full turns on main jet or it will stumble under load. If the kohler has an issue with colder winter air, which it hasn't in the past, I'll reduce the ethanol ratio.
Ethanol is the only way I've been able to lean down mix. Been thinking of a way to determine if I'm lean of peak, but measuring temps on an engine I only operate at half rpms won't work. Buying an O2 sensor for exhaust is over budget.
So monitering plugs and looking at top of piston is my only way to see what's going on inside engine.
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Today's Featured Article - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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