Originally Posted by C-NUMB
The tohatsu is not bad on Hp. Its tested on the shaft 20-21 hp, still considered very reliable.
How much loss at the prop if the 18tested on the shaft how much nearer will it be tested at the prop to the 15 he has already OMO but 5hp will be a lot more noticeable than 2 possibly 3hp.having said that!
There's an interesting YouTube trial done in Russia of a 20hp EFI and a 15hp carb suzuki's with 3.80 m suzimar boats I was very surprised how near they were worth a look!
It's a tuff choice given space David has and a few kilos can make manageable difficult.