With the engine at a slow idle, you can screw with that bottom adjustment all day long and you will NOT notice any difference unless you screw it ALL the way in, which will stop the flow of fuel completely. The engine must be running wide open, under a load, before that bottom screw will make any difference. My advice is to screw it all the way in until it seats, and then turn it 3 full turns out (factory initial setting) and leave it there. The low speed idle adjustment, the one up on top, SHOULD make a big difference with the engine at a SLOW idle. The initial setting for that screw is 1 1/2 turns out.
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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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