With F-4 magneto you have the spark advance/retard control, make sure it is partially retarded (not full advance) before starting to crank. The magneto is timed to trip the impulse at top-dead-centre when the advance is full, i.e. the magneto fires 35 degrees ahead of top-dead-centre when running. If the advance lever is set to a retarded position, say half-way between shorted and full advance then the impulse will trip some time after top-dead-centre reducing the chance of kick-back. Again only pull up on the crank, to not try to continue rotating the crank, and keep the hand open, i.e. do not wrap thumb around handle. My O-12 has the same magneto and has not tried to kick back, not like H-4 magneto on the Super-A where there is no means of retarding the spark so it does fire on top-dead-centre and it has kicked back several times. I take the similar care with the W-4 with its H-4 magneto.
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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