1999 OX66 - Overheating - Seatrial

[Cliffteeray]

I just "sea trialed" twin 1999 OX66 200's which have approximatly 400 hours. After warming them up and getting about 20 feet away from the dock the port engine overheated. Upon removing the head, it appears that salt build-up is clogging up the head and impeding the water circulation. The Yamaha mechanic tells me that this is a common occurance, nothing that a clean-up of the head won't cure (at a cost of approximatly $400 for both engines which the seller is going to pay) and should not stop me from purchasing the boat.

Also, the port engine was "peeping" just fine (the one that over heated) but the starboard was bearly. The mechanic believes that this is a sign that the starboard side must also be clogged.

The boat was not used much and was in indoor rack stored for a few months.

Any thoughts?

Thanks

 

[99yam40]

Re: 1999 OX66 - Overheating - Seatrial

2 saltwater motors that are about 13 years old,
that over heated even before you were able to run them through there RPM range to see how they run out, because of corrosion/salt build up internally.
A good look at the internals yourself before and after clean up would be a good thing to see, before they button it up

I would let the owner get them cleaned up and then see how they run before buying.
who knows how bad they truly are and if they break bolts pulling heads and other parts to clean them up properly. salt water can eat up the internal parts badly if not flushed well with fresh after use in salt every time
$400 sounds very little to do a good job on 2 motors,
Just my thoughts

 

[yamatech43]

Re: 1999 OX66 - Overheating - Seatrial

Yeah, why would you buy these and then have fixed....by the way if it's just buildup you can pour Volvo's "NeutraSalt" in through thermostat 'holes' after you pull thermostats, pour in undiluted with coke bottle you can squeeze for a little pressure and let flow down
through each head and out exhaust....let sit 15 mins and repeat...you will be amazed at what this stuff does....wouldn't pay 50 dollars to have this done....$400???? lol
Of course I wouldn't buy these motors either...having worked on saltwater motors only for so long....would go to lake country to buy motors....really.