looking into a new (used boat) never owned or worked on outboards. I am looking for recommondations on which are the most reliable?? have heard great things about Mercs and Yamahas, but heard early Merc Optimax's had some problems running lean because of the fuel rail or something which could pop a powerhead?? other than that people love them, I don't want to buy a grenade!! what have you had good luck with? I'm also kind of a speed junkie and love to tinker, is this something you shouldn't do with OBs