I had intermittent problems with my 3W ignition (about 4 years old) and replaced it with a DA ignition. Problem solved. I was able to use the same magnet in the same hub with the same sensor. Just bought the ignition module itself without the sensor. Had to solder a different connector on the sensor, I think.

My problem was that after about 15 minutes of run time, especially on a hot day, I would get very poor running, probably losing a cylinder or missing some cycles. The change was sudden and would force me to land. Cool off, re-fuel and I was OK again (for another 15 minute flight). As long as I stayed under 15 minutes, I was fine.

But with the DA ignition, I can fly the tank dry (about 20 or 25 minutes). Dave at DA said the ignitions were of similar design, but his may have better heat dissipation thru the case.

The engine is a 4 year old 3W 100 B2.