4/6/2024 0 Comments Morris magneto for saleIt takes more spark voltage to jump the usual. Presence of spark at the spark plug in open air is not a valid test as it does not accurately emulate the effects of the fuel/air mixture and compression.Air is normally an insulator but if we clobber it with high enough voltage it will break down as an insulator, ionize and conduct electricity. This is fairly reliable and easy to do in the field without special instruments. Most manufacturers describe cranking the engine at normal cranking speed and holding the end of the plug wire 1/16"-1/8" or so from the engine block and see if we have a spark. The first test to perform with a no go before a frontal assault on the magneto is to determine if it is indeed the problem. We will start with some basic tests one can do without special service equipment and show how things can get really complicated, confusing and totally out of control later with test instruments. Here we will share some basic testing and troubleshooting gleaned over many years and beers from college professors, farmers,mechanics,coworkers and the college of hard knocks.
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