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I took off Thursday for a short business trip. The run up was just fine. Just as I rotated the engine burped. I was too far along to abort so I continued. I flew a few miles south of the airport and did a mag check. The engine stopped when I switched to the right mag so I returned to the airport. Called my customer and apologized for being late and started driving. This has happened a few times before. It has always been a points issue and I assumed it was this time too. I left work a little early on Friday and went over to Frank's and bought a couple of mag gaskets. I had some friends who wanted to go to Lake Havasu yesterday so I got out to the airport early to fix the mag. After pulling the cowl the first thing I did was pull the top plugs, put on the mag tester and check the points. The timing was off about a degree and a half, but both points were working. Not what I was expecting. I figured they might be on the edge of failure, so I pulled the mag. Both points looked like I would expect for the time in service. The internal timing was off by the same degree and a half I found the engine timing off, which is expected. I reset the point gap to get the correct internal timing and restore the point gap for the warn points. The mag tester showed both sides working just fine. I put the mag back on the engine and fired it up. It started right up and ran smooth I switched to the left mag and smooth as silk, I switched to the right mag and dead engine . So, what else could it be? I ohmed out the P leads and they were correct. Well, maybe it is the condensers. I swapped the two condensers but the failure stayed on the right mag. Oh crap, I'm running out of options. Maybe it is something in the P leads. I put in my test P leads and had a friend start the engine. With the engine running I shorted the right mag to ground, nothing happened, I shorted the left mag to ground and the engine quit. So, what do I know? The P leads and switch are good, the points and coil primaries are good or the mag timer wouldn't work. The condensers are good. The only thing left is the coil secondary windings. I don't have the tools to repair this mag myself so I will have to send it off to Texas. This sucks because I have a couple of trips planned in the next few weeks including a vacation at the end of the month. I hope I get it back in time.