A leaking nozzle will knock like crazy, so easy to check because you just have to pull the lines off nozzles,(commonly refered to as injectors) crank engine over a few times and observe. Good ones will not push any compression out at all, shot one will shoot right out and worn ones may push a little out, and you don't have to bleed anything, just screw them nuts back on. Have seen many drop the pintle from nozzle tip which can give you both a fuel knock and a mechanical knock from it becoming imbedded in top of piston. Be interested to see what you find, could be any of suggested remedies.
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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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