Im putting together my first 2M pattern plane and chose to use an OS140RX.

I read lots on these forums about the various motor choices and admitadly the YS140DZ was looking very nice. Then I remember the hassles Ive had with my YS63S, it is still really being broken in though. It seems as though it reacts a lot more to ambient temperature and local air pressure than my OS50SX.
I watched at the local pattern comps and saw the hassels everyone had with the OS140RX and the YS140DZ and other YS motors. Nearly every time the OS failed to start or stopped in flight was due to user error. Theres one guy flying an OS140RX who Ive seen blow out the glow plug at least twice, thats right, blow it out of the engine, not wrecking the thread, so it cant have been in too tightly to start with, poor pre-flight procedure and or poor maintenance ? The YS crew however, seem to have by far the most trouble in flight. One guy had deadsticks early in his 1st and 3rd round, in a one day comp, that killed his score bigtime.
Based on my observations, the relative cost difference outright as well as number of spare parts possibly req'd for long term running cost as well as the fuel cost, I went for the OS140RX.
Some may say Im mad to be building a 2M now, when Im still a very average flyer in sportsman, but my wife and I are expecting our first little co-pilot early next year, so it was a case of spend the money now or never.