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 - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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