Originally Posted by chrishowden
Doesn't have space for 2 outboards so will have to a bigger outboard
If in pursuit for max top speed, put a induction tacho to your motor and make a wot test, check max wot rpm achieved, factory outboards usually comes with medium pitched props so you can play a bit with different -, + size pitches for different applications.
Example: If your motor works between 5 to 6 k rpm and you are achieving lets say 5.5 k with current prop at wot, placing a less size pitch prop will rise about 250 more rpm. Install the prop that gives nearest rpm reading to match 6 k at wot. Will lose best hole shot but will gain slight more final speed. Check props sizes, tacho brands market available. If final speed does not suits you, go for a larger engine.