There have been a few threads on this engine before...
http://www.rib.net/forum/showthread....ighlight=df140
http://www.rib.net/forum/showthread....ighlight=df140
Very good, clean, reliable engine, and good on fuel too.
I am uncertain as to whether I'd have bought the Yamaha engine if it was out at the time, purely cos it weighs in a lot more than the Suzuki. Saying that though, the block itself is larger, so I'd guess a bit more torque, but more fuel useage?... not sure
-Alex