In a quiet place, remove the spark plugs, slowly rotate the flywheel clockwise. You should hear the timer click when the knob is a couple inches away from approaching the timer lever position. It doesn’t matter where the timer lever is for this.
Next test, with a tiny flashlight, look at both pistons when they are extended all the way. The intake side of each piston should now be easily viewed. The intake side is opposite the exhaust side which is easier to describe: the exhaust side is the long shallow sloping side which should be facing the rear (not seen)..
