What are reed valves in my 85 Mercury 75 hp outboard and how hard are they to replace. If reed valves were damaged how could that happen and and what would the effects of damaged reed valves be? My motor runs good when you first get in the water but after the motor warms up when you stop and then engage gear again it wants to stall or bog. I can still get it to go by playing with throttle and I can hit choke while giving it the gas and it takes right off. Cranks every time and runs smooth in idile and runs great at speed just problem taking off. Compression is good also, can run all I want as long as I keep moderate speed no prob. just on take off , does this sound like reed valves problem?