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Post on Rotax 912 trigger coil dissected in 4-strokes
By flywise, postedHey
I would like to share my findings regarding the expensive rotax 912 trigger coils. It all started with a 300 rpm mag drop.....
The manual states the values regarding the resistance across the winding of the trigger coil (inside the plastic housing) and when I measured mine it was within limits. Then I measured the resistance between the center pole piece and ground....I had a high resistance and each trigger had different values (there is NO info anywhere about that measurement). I thought it should be an open circuit there ....and as I am curious by nature, a few hours later I had the trigger appart to see how it is built inside. Looking at the simplicity I would like to see these triggers cost 8 $ each.......and not the 200 $ rotax is asking us.
Also I found some of the center pole pieces to be covered in rust as there is no seal between the plastic casing and the pole piece going through. The high resistance I measured is normal I think as the center pole piece is in contact with the magnet and the magnet is stuck to the metal bracket. I actually am measuring resistance through the magnet.
That's it for my latest head scratching activity
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In search of a used 912 rotax ignition harness, with coils, any thing out there for sale?
Thanks in advance!
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In search of a used 912 rotax ignition harness, with coils, any thing out there for sale?
Thanks in advance!