Trastan i bought a 4.3m tinny with a 55hp on it i later replaced the engine with a 25hp mercury bigfoot its a high thrust model off a house boat my speed went from 47kph to 32-33kph it was a huge difference all though the boat still planed heaps easy and quickly it still left me wanting the power of the 55hp engine but the fuel economy of the mercury 25hp was unreal
Going at 15kph u wont like it one bit you'll go out and after the 4th trip of sinking a few thousand bucks into a engine you'll wish u had those few extra ponies