Like Mike says, I see too much talk about how much harder a four stroke is to tune and maintain then a two stroke,BS!! Nothing yanks my chain more then seeing people that have heard or seen someone with a YS having a problem then posting how hard a YS engine is compared to other four strokes. BS, that's just stupid!! That one little extra screw is almost never touched. I only open my engines once a year to check the valves, not adjust them. Tachs, I went for a lot of years with running four strokes without ever having one. Then I tried some cheap tachs because I work and tune so many four strokes and wanted to get things set dead on. I couldn't find a good cheap tach so I spent the money and now have the high end unit. I use it but not that often on my own engines. I did when they were new or just got rebuilt but I know my own engines very well and don't need my Tach all that often. I use it when I'm working on someone elses engine though. I'm only flying one plane these days with a two stroke engine, I really like this two stroke but I really really like all of my four strokes. Anyone thinking of buying a four stroke for the first time, go for it!! There is nothing very different or hard about them. If you want the power give a YS some thought. A four stroke in a GEE BEE??? Cool!!! If it was mine it would be a YS though!! I also use a TNC tach. Way Cool!!!![8D]