Re: 4hp outboard motor questions
I have a 5hp two stroke which has plenty of power for an 850kg yacht.
The 4hp four stroke with long shaft and high thrust propeller will easily do your job but a 6hp longshaft with high thrust propeller and external tank will do your job better.
Any money spent on the bigger outboard will be well spent and leaves you with some extra thrust to push into a bad wind or tow another yacht.
Short shaft engines are not suitable for most displacement hulls.