I have read about all the problems with the 800 engines. It sounds like it is mostly caused by fuel mapping. Do the 600 CFI engines have similar problems? I'm thinking of getting a 600 RMK as it has enough power to get this skinny old guy where he needs to go. The only negative thing I have heard so far about the 600 engine is that there may be a crank bearing issue but I don't know if that is a widespread problem or not.