You have totally misconstrued what I've been try to get across to you. It is very unlikely your insurance person would NOT insure your boat or deny a claim for any damage to the boat. So what do you put on the registration? 140 when it is really a 200. Oh yea -- I'll put 140 decals on the motor. Now you have two issues. 1) false information on a state registration and 2) false information to your insurance agent (provided of course they asked for HP on the application). What I did tell you is insurance MAY be an issue if an ambulance chasing attorney uses your over powered boat as a way to convince a jury of your disregard for safety and as contributory negligence in an incidnet. Sir -- the boats you saw with bigger engines were probably "designed" for that much horsepower. Length is only one factor. A Ranger Bass Boat for example is designed to handle big engines. Every boat including yours has a "design limit" determined by the manufacturer to be safe and those calculations and considerations have already been done so why bother searching for an answer you already know If you look at brochures for boats in the 14 - 19 foot range and some even larger you will see that two identical boats, one with a tiller steer and one with console steering have different maximum horsepower ratings even though the hulls are identical. That is for safety purposes and the difference is primarily because of the handling differences.. The fact is, either boat should not be powered with an engine of more than the maximum rated horsepower. Look at the sidewall of the tires on your car and you will find a "maximum inflation pressure" warning. These limits are there for a reason, not for decoration. And being able to put a small block Chevy V8 in an S-10 is yet another example of your misunderstanding of this concept. Can it be done? Absolutely. Is it safe? That depends on who did the conversion, what parts were used, and the mere fact the conversion is not EPA legal makes it very illegal. If you ignore that fact and that vehicle is in an accident, your fault or not, an illegal vehicle can be used against you just like the boat scenario. Do the attorney ads on TV ring a bell. Pay attention to them. Who is the first person they want you to call? No -- it isn't a doctor. Lots of risky things are done every day and people get away with it. You seem to be unconcerned about the possible consequences. If you feel lucky, go for it. Just don't get into an incident involving me or any member of my family as all of your stuff will be mine. There is simply too much irresponsibility going on these days and having been affected by it, what had been "advice" to this point has now turned to a "fatherly warning". It is not worth the risk. Your life will be a lot smoother trip if you follow the rules and that's not just when boating. Just because you have a "deal" at hand does not make it the right thing to do. Look at it this way, if the Yammy is a deal at $3000, buy it and resell it for a profit. Then buy a good/rebuilt 140 and be happy.