Back to basics. The engine needs 3 things to start. If it has those three things, it will start. 1) Compression. Need sufficient compression to compress fuel/air mixture for combustion. Low compression means no start. You need to VERIFY that you have sufficient compression. Guesswork is just that - guesswork. 2) Fuel/air mixture. Fuel and air mixture required for combustion to take place. Ideal mixture is about 14 to 1 air to fuel. Fuel needs to be atomized so that the mixture is fairly uniform. 3) Spark. Properly timed spark. Spark at the wrong time will simply not ignite the mixture as necessary. Weak firing or leaky (electrically) spark plugs will inhibit starting.
So, my suggestion is to start with the basics. Begin with a compression test. Compression testers are not expensive, and are available at most any auto parts store. A set of spark plugs (3 of them?) would cost about $10 to $12?
If you are looking for an answer as specific as which bolt to adjust or what the valve clearances are, I can't help.
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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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