I have a Rotax 503, and I still do not understand what the "ignition damping box" is for. Someone can help me ?
No mistake in this drawing, in my opinion, just the ommited connections from the points to the mass (Red added)Uncle Willie;n1127372 said:The Older Rotax 2 Stoke, Points Ignition, Not CDI ignition, Operators Manuals have a major mistake.
The drawing with the Magneto, Points, and Cam show the wires connected to the wrong side of the points.
The wires should connect to the point at the end opposite the Magneto Coil.
It will never work if wired as depicted.
This is exactly the case, Chuck, since the breakers corresponding to each ignition coil are on the opposite terminals of the generators.C. Beaty;n1127381 said:JC,from your diagram,the primary terminals of the ignition coils are reversed between the two sides and since the center electrode of the spark plug should be the cathode, it must be that each primary has opposite polarity induced by the flywheel magnets..
That's not so. The contact breakers is screwed directly on the plate (ground), without any insulation. Only one wire is connected to it, like showed in my post #7Uncle Willie;n1127401 said:The Points are in series with the Magneto coil.
Yes Bill, the points will be shorting both ends of the Magneto coil to ground. But so, when the magnet rotates, an induced current flows in the magneto coil in short circuit, which keep the magnetic flux near zero. When this induced current is cut by the breaker, the magnetic flux appears suddenly, and produces a high induced voltage applied to the primary side of one of the ignition coils. There is one spark at a time.In the diagram in Post #7 as modified, the points will be shorting both ends of the Magneto coil to ground.
This will never allow the magnet field to be induced in the spark coils.
I'm sure of that, Chuck. But I do not see any problem with this. Flyback exists also with the ignition by battery, without require countermeasures.C. Beaty;n1127450 said:the damper box suppresses the flyback pulse.