I have been flying the YS-170 CDI for some time, probably 100 flights or more. It has worked great for me using Cool Power 10% LS oil and 30% nitro. Those of you who were at the Ocala Fl. contest will recall that I had a problem with my engine on the 4th. flight on the Saturday which prevented me from flying that airplane on the Sunday.

It turss out that I had a bent crank shaft causing the front bearing to rotate in its housing and destroying the crank case. Richard at YS replaced the necessary parts and returned the engine to me including the old ignition module which did not repair.

I now have 10 flights on this same engine in a new Aires. It is running 400rpm stronger than before @ 7600+rpm on an APC 18.1X11. I have posted a few words about the engine and the airplane on my photo album here http://albums.phanfare.com/5187035/3...ageID=67692433