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 - New Hitches For Your Old Tractor - by Chris Pratt. For this article, we are going to make the irrational and unlikely assumption that you purchased an older tractor that is in tip top shape and needs no immediate repairs other than an oil change and a good bath. To the newcomer planning to restore the machine, this means you have everything you need for the moment (something to sit in the shop and just look at for awhile while you read the books). To the newcomer that wants to get out and use the machine for field work, you may have already hit a major roadblock. That is the dreaded "proprietary hitch". With the exception of the
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