do like el toro said and run a compression test. run a dry one then wet. first pull the spark plugs and examine them closely, keep track of the cylinder they came out of . look for oil fouling, or wet plugs ect. next with the plugs out and throttle wide open, do compression test on each cylinder, and write the numbers down. they should be within 10% of each other, somewhere between 80-125 psi. then squirt 2-3 pumps of oil with an oilcan in each cyliner, turn motor over a couple times to spread oil around, then re-run compression test. if you get a big jump in compression, most likely rings are worn. if the compression doesnt jump or very little, look toward valves, guides and or seals.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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