A Tuneup is as much diagnostic as it is prescriptive. Your goal should be to receive a fully functioning boat. The seller's goal is to provide one. If a tuneup is required to achieve that, that's on him.
To put it another way, you shouldn't have to care what the seller needs to do to make the boat sellable. If it is throwing alarms, or not reaching spec'ed rpm, or failing to fry your eggs, whatever, there is no need for you (or your wallet) to get drawn into the drama.
To put it another way, you shouldn't have to care what the seller needs to do to make the boat sellable. If it is throwing alarms, or not reaching spec'ed rpm, or failing to fry your eggs, whatever, there is no need for you (or your wallet) to get drawn into the drama.