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 - 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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