Nope, not the case. Gas tractors will run without spark, it is called dieseling. Often times this is caused by carbon buildup in the combustion chamber from running too rich, the hot chunks of carbon pre-ignite the gas. I would give it a general tune-up, start with the carb. Just above the fuel line on both the zenith and the marvel-schebler (yours has the zenith from looking at your pics) carbs is the idle mixture screw, set the throttle at idle, and then adjust the idle screw for highest RPM. Then set the load circuit, should be a t-handle adjusting screw at the bottom rear of the carb, below the fuel line. Start at 1 3/4 turns out for your zenith,adjust at PTO speed for smoothest running. Also, your carb heater block is set to its cold weather setting, it is the block on the manifold above the carb, it could cause the dieseling issue, unbolt it and you will see how it will reattach and not direct hot air around the carb. For timing it, hook a timing light to #1 cyl, open the timing window over the flywheel just in front of the brake pedals, run the tractor to 1900RPM, loosen the distributor clamps and line the "20" degree mark up with the mark on the bellhousing. All this came out of my 4010 operators manual, hope it helps.
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