Don"t replace anything until you figure out what the root casue of the problem is. When it doesn"t start hot, pull the wire out of the center of the distributor, hold it near a good ground and try to start. You should have a FAT, BLUISH-WHITE SPARK, the color of lightning. If you don"t, then the problem is in the primary ignition ciruit most likely. Some where between the battery, through the key switch, to the coil to the distributor to ground something is not working correctly. Key switches go bad. Jump across the key switch and see if that gives you a spark. If it doesn"t that"s the problem. Crank the engine till the points close and measure the voltage with the key switch on at the battery side of the coil. You should have full battery voltage. Measure the voltage at the distributor side of the coil. It should be near zero with the points closed. Open the points and it should go to battery voltage. if it doesn"t go to battery voltage with points open, then the coil has an open circuit. Do you have the correct coil for your elecrical system. If you have a 12V system, you should have a real 12V coil like NAPA IC-14SB(~$15) or you can use a 6V coil with a current limiting resistor but I would strongly recommend the real 12V coil. One less failure mode! If you have the requisite, FAT, BLUISH-WHITE SPARK, then check the fuel delivery to the carb. make sure that you don"t have any fuel lines near a hot exhaust manifold where it could cause the fuel to boil and vapor lock. You only have gravity pressure in the fuel systems so if the fuel lines gets hot, it doesn"t take much for the fuel to vaporize in a supply line. Make sure the fuel tank vent is clear. You can check for adequate fuel delivery if your carb has a drain plug in the bottom of the fuel bowl. Open the tank valve and holding a suitable container under it to catch the $4/gallon gas, open the drain plug. The fuels should CONTINUOUSLY GUSH OUT LIKE A COW PEEIN" ON A FLAT ROCK! if it dribbles or is intrmittent, you need to check and see why. Check all the screens and filter between the tank and the carb and look for a kinked fuel line also. Ifyou systematically make these checks inthe order that I have listed them, you should find the root cause of your problem.
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