Nup, You're the one who's going to be outlaying the dough. If he won't let you ispect reasonable aspects of the boat then I'd move on.

if you were to get a prepurchase inspection any reputable mechanic would do a compression test, inspect the leg oil (not drain completely), pulling the floor up on a bayhunter is a pretty straight forward process its just marine ply screwed down so cant really go wrong there either and a sea trial goes without saying

so if that is a problem then either he has something to hide or is very untrusting of yourself

 I understand he is concerned that his vessel may be damaged in the hands of a hack doing the inspecting. I am a tradesman in the marine industry (diesels not outboards) and was going to let him watch every step of the way. Had cash ready in my hand as well... ahhh well something else will come up

 Regarding the oil leak is the motor 2 or 4 stroke

2 stroke, hence the concern....

 If he doesn't know you from Adam and outboards are not your business then he is entitled to not let you tinker with his outboard. If you were happy to pay for an inspection by a recognised and qualified outboard mechanic and he didn't want to then I would see that as a red flag.

When I bought my boat just recently, I broke all my own rules regarding having inspections etc as it was the right price and was what I wanted. After a quick sea trial we sealed a deal. I did however get to talk to the mechanic that serviced it in the previous 12 months so that was something.

Its reasonable to ask , but I wouldn't let youift up my floor or pull shit apart on my boat either. Id wait for the next guy to come along. Each to their own I suppose.

 Might be a good idea for the buyer, but the seller doesn't know you from a bar of soap. I've had old blokes try to pull up my floor when I've said it doesn't come up (unless you unscrew it), people shaking the wheels on my trailer etc and it really pi$$es me off when people tamper with my things.

More than happy for the buyer to get a qualified mechanic to have a look and then do a sea test, but I'd want a deposit first to make sure hes fair dinkum and not just looking for a joy ride. However in the 12 boats I've had, I've never been on a sea test or done a sea test for a potential buyer!

Probably wouldn't let you pull up the floor of my boat when there's no guarantee you'd buy it, and then i'd have to spend my own time to put it back for the next bloke to look at. A good check on the motor is reasonable though 

I'm happy to pay someone to do it if that was what he wanted, but really.... A compression test is a simple no brainer procedure. This was never offered as a solution by the seller either.

The floor, yeah I get that someone not really interested would cause heartache lifting it if they just up and left without refitting it. But I had cash ready to pay... Had the engine been serviced by a mechanic recently I would have taken his word for it (The mechanic's not his) that all was honky dory. He claims the guy he bought it from told him all was good.... That doesn't mean anything to me at all.

There are plenty of other vessels for sale.... All is not lost :)

 Yeah its a tough one, id want to look at those things also though lifting a sealed floor is a sticky one.

My last 2 boats have private sales, sight unseen.

A leap of faith but at the right price...

I wouldnt let anyone muck around with my engine etc without my direct supervision and a solid deposit contingent on specific items such as compression inside manufacturers specs.

If its ok then you dont want it lose deposit, especially if buyer is a ditherer

Would there be an easier way to inspect under the floor ? Other than removing it ?? maybe using compressor or such to blow anything that is under there out ?? My only reason for wanting a look under there is to make sure there are no sinkers etc there.

Might try him again and see if he is open to me having someone come do an inspection on the outboard. Anyone know anyone that does this in the Mandurah area ??

 if it is a pressed hull with ply floor, shouldn't be hard to get it up. It may mean he had never had it up himself(not good) or has something he wants to hide. IMO, deck on a boat like that should be up once a year, if only to check some t**t hasn't dropped a sinker or swivel down there. My boat has just gone up for  for sale , I'd happliy pull up the floor for a serious buyer. Letting some oil out of the leg is certainly no big deal, either. Compression test? I'd prefer to have that done by someone I trust as competent.

Is it a sealed deck or non sealed? If it's not a sealed deck then perhaps there is just a small section of floor you could remove? In the front of my Quintrex coast runner (I think similar to a bay hunter?!) there is just a small floor panel up the front that you stand on while driving. Maybe you could just ask to lift that one panel, that won't tell you if there are any sinkers in the hull or not but could give you an idea of how much crap could be in the rest of the hull.

 My mates been looking at boats. Hes seen afew 6mtr+ quinny hes liked. 

I told him to look under the floor as most are non sealed. Reason being these things are prone the cracking as there just a glorified tinnies. Im sure if a deposit was put down subject to passing inspection it wouldnt be a problem. There only screwed down.

Now if it was a sealed deck thats a different  story. Ive pulled up my cover in my deck and removed fuel tank afew times and its a 3 hour job. 

 If its a pressed hull Id put the bungs in and put a few hundred litres of water in it to make sure theres no cracks in the keel or leaks .  They are really hard to see and a nightmare to fix properly.   A good sea trial in choppy conditions should show up any other crack problems.  Moving floor, creaking noises etc.   Personally I wouldnt buy an aluminium boat without inspecting under the floor first.  

 Gotta be jokin. Three guys and an esky full of shit weighs 300kgs .  If you cant take the floor up water finds cracks and holes from osmosis even ad some food colouring.. Leave your boat out in the rain with the bungs in can end up with a ton of water your trailer will break before the boat ever does.

 I'm not a huge fan of filling a hull with water unnecessarily. All the stresses would be on the spots the boat contacts the trailer. How long did it take you to lift the floor on the bayhunter you bought ? My guesstimate would be about an hour ?

10-15 min tops.... Mine is a 97 though with the pedestal seats that just slot into the floor... So it's as easy as removing seats, undoing screws, and lifting...