while motoring up the ohio i beleive i hit something, after that i could not go over 2500rpm without some serious engine shaking.<br />prop ok, no metal shaving in oil,sparks ok when i took out again ran great for 25-30 sec 3500rpm tjen motor bogs down and won't go above 2500 again, rested motor for 30 mins and same thing..not real mechanical just need possible ideas??? thanks..90 johnson 60 3cyl