i believe someone's theories have gotten crossed up, if what is being explained is correct how did the old timers leave them (parked on starter as they called it)then let it roll down the hill pop the clutch to start it ,the principle behind the impulse coupling is to snap the magnets in the magneto past the windings fast enough to create at spark at low speed,once the speed range of the impulse coupling is exceeded the magnets are spinning fast enough to produce enough current to fire the coil,if you want to test this turn the flywheel of a small engine in a slow continuous motion passing the magnets under the coil no spark,then rock it past in a snapping motion it will fire.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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