Posted by KEB1 on March 13, 2008 at 20:27:44 from (63.228.82.237):
In Reply to: Won't start day3 posted by troyr on March 13, 2008 at 11:27:57:
This may seem like a weird question, but has that particular engine run with that particular magneto in the past? Reason I ask is that there are two styles of four cylinder magnetos, one that turns at the same speed as the crankshaft, and fires twice per revolution, and one that turns at 1/2 the crankshaft speed and fires four times per revolution.
Comparing your photo to the one a little further down, it appears that you have one that fires four times per revolution, i.e, the rotor is connected directly to the input shaft and the center of the distributor lines up directly with the input shaft. In these magnetos the rotor turns in the same direction as the input shaft, which would also be consistent with your rotor turning counterclockwise looking at it from the rear.
The other picture shows one that fires twice per revolution, and the center of the distributor portion is offset from the input shaft because of the gears between the input shaft and the distributor rotor. In this style, the rotor also turns in the opposite direction of the input shaft, i.e, clockwise looking at it from the rear, and the rotor makes one complete revolution for every two revolutions of the input shaft.
In either case, the rotor should turn at 1/2 the speed of the crankshaft, or one complete turn of the crank should result in one half turn of the distributor rotor in the magneto. Pull the distributor cap off & check.
Realize this might be a shot in the dark, but given how much effort you've put into this just about anything is worthwhile checking.
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