i have a suzuki outboard which last time out after about 20 mins over reving warning buzzer came on i wasnt going full throttle it was about 3500/4000 revs i think aslo seemed to be quite alot smoke or steam coming from the engine hood appaently there is a crack in the water pump housing (which was spotted on its last service but i was advised it would be ok ) could this have something to do with it and if so how easy is it to change