Stay away as long as you can. They both use EGR (Exhaust Gas Return)technology to slow the burn of fuel in the cylinder to reduce the formation of Nitrous Oxides. New Tier 4 engines use DEF Fluid this gives them better fuel economy over tier 3 because not as much EGR is used. Also the newer engines have many more electronic sensors on them to manage the emissions. These sensors lead to more Check Engine lights which can only be corrected at the dealership, which means more down time which means more expense to operate. If you can, find or use your older equipment for a looooong time.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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