since it has changed on you like that I would be inclined to think camshaft out of time or perhaps if the drive gear or driven gear are keyed that one or the other might be slipping on you causing the valves to not open correctly..i would look into the bores with the spark plugs out and watch the valves opening and closing on each cylinder to see if the timing on piston rising in relation to intake opening and closing and exhaust staying shut to tdc is remotely close..also check valve lash and make sure you don't have them to tight so they don't close all the way..someplace to start anyway hope this helps
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Today's Featured Article - Tractor Generators - by Chris Pratt. As a companion to the articles on three-brush and two-brush generators, it seemed fitting that we should provide our readers with a description of how a generator works in lay terms. The difficulty with all those "theory of operation" texts is that they border on principles of electricity or physics and such. Since I know nothing of either, you will have to put up with looking at the common sense side of how generators work which means we "
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