I have done several H's in the past. The biggest thing is you will absolutely have to change the spark plug wires. The Petronix ignition module requires carbon core wires. The tractor will not run correctly with out them and you could burn out the ignition module. This is stated in the installation manual in the kit. The spark plug gap is not really that important if you have a stock engine. I would replace the coil also not just for an performance increase the new one might get you. Coils will go bad with age. I burned up a Petronix module when the coil on one of my tractors shorted out. Word of warning, DO NOT leave your ignition on with out the tractor running for an extended period of time. This will burn out a module also. I will run my tractors dry after I use them and I forgot to turn off the ignition on one of them over night. It killed the module.
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Today's Featured Article - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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