1991 twin 200hp yamaha percision blend

[woodworker2001]

Guys looking at purchasing a 1986 Grady White, which was repowered back in the day with these engines...

Are there common issues with these engines? Things I should look for? Let me know your experience with these engines please the more information the better!!!

 

[rodbolt]

Re: 1991 twin 200hp yamaha percision blend

are ya nuts or making funnies?
you talking about antique engines here. no when new they were solid, 20 years later and possible saltwater use or neglect, all bets are off.

 

[woodworker2001]

Re: 1991 twin 200hp yamaha percision blend

Not making funnies and maybe I am crazy, but they are what is on the boat....

I know I want to run a compression test ( 110 psi + correct?) and check to see if the shift rod has ever been replaced on these engines, but is there anything else to look at.

I know that the boat will require repowering eventually, but that wont be in the budget for 5 years or so. The budget doesnt have room for a newer boat with newer motors... it will be something like this or a boat with an older inboard.

The age doesnt scare me as much as any well known issues with the engines... As far as I know they havent seen saltwater use and I know they havent in the past 5 to 10 years...
These are oil injected engines if I am not mistaking so the oil mixture wouldnt have been incorrect unless there was a mechanical failure.

The only documented recurring issue with the older yamahas that I come across in reading is the shift rod.... are there others?

 

[robert graham]

Re: 1991 twin 200hp yamaha percision blend

If you've established with a sea trial that both motors are running fine now, and they're not saltwater motors, and the compression tests good on all cylinders, and they've received at least normal maintenance, and the water pump impellars are fresh, and if the price of the entire rig is really good, then go for it with the expectation of spending some additional money on certain repair or preventive maintenance items. You might even consider paying a knowledgeable third party to survey the boat and motors and give his evaluation on the price and possible issues. If the price of the rig is attractive enough you can afford to roll the dice. You might buy it and get several good years of use out of it before any big problems or you're ready to repower. Good Luck!

 

[woodworker2001]

Re: 1991 twin 200hp yamaha percision blend

Impellors are fresh as of last year.... The price of the rig is within my budget and if he is willing to come down it is attractive... I was definately thinking a survey is in order ... more from stand point of stringers, but the engines as well... Certainly will be taking vessel on sea trial and seeing what happens...

Thanks

 

[robert graham]

Re: 1991 twin 200hp yamaha percision blend

Well good luck and let us know what happens!

 

[woodworker2001]

Re: 1991 twin 200hp yamaha percision blend

Any other insights or comments? Anyone have any of these old girls still?

Thanks
Dan

 

[rodbolt]

Re: 1991 twin 200hp yamaha percision blend

other than the shift shafts in saltwater those engines were rather bullit proof if maintained a bit.
a full model number would aid in telling you exactly which version of a V6 yamaha your getting ready to buy.

 

[woodworker2001]

Re: 1991 twin 200hp yamaha percision blend

other than the shift shafts in saltwater those engines were rather bullit proof if maintained a bit.
a full model number would aid in telling you exactly which version of a V6 yamaha your getting ready to buy.

have you ever used the shift shaft to replace one or heard of it? Here is a link....
http://shiftshaft.com/index.html

 

[rodbolt]

Re: 1991 twin 200hp yamaha percision blend

never heard of it nor used it, most times by the time the shift shaft is done, so is the rest of the engine.
salt is tough on them here in my area.
when you sea trial it make sure both trim guages work and then keep the senders sprayed with fluid film.
2.6L v6 motors from 1990 to 1995 use the trim sender to allow or disssallow oil transfer.

 

[woodworker2001]

Re: 1991 twin 200hp yamaha percision blend

never heard of it nor used it, most times by the time the shift shaft is done, so is the rest of the engine.
salt is tough on them here in my area.
when you sea trial it make sure both trim guages work and then keep the senders sprayed with fluid film.
2.6L v6 motors from 1990 to 1995 use the trim sender to allow or disssallow oil transfer.

In other words if trim sender goes out no oil is injected into the engine?... Is there a warning with this? That seems odd to me(not guessing the knowledge just the engineering principle and reasoning)....

thanks
Dan

 

[rodbolt]

Re: 1991 twin 200hp yamaha percision blend

dude
check with your local community collage.
take some classes on reading AND reading comprehension.
no where in ANY post did I say or anyone else say the oil injection fails.
just said transfer from the remote tank to engine tank can be dissallowed.
why dont ya do some forum searching, then lay your system out on paper and understand whats going on with the oil system.
it actualy works very well if well maintained.
right after you do your coures, I enroll for spelling and keyboarding.
we will call it a wash.
the actuall injection on your engine is a mecanically driven pump.
has NOTHING to do with anything other than pump arm angle and engine RPM.

 

[woodworker2001]

Re: 1991 twin 200hp yamaha percision blend

dude
check with your local community collage.
take some classes on reading AND reading comprehension.
no where in ANY post did I say or anyone else say the oil injection fails.
just said transfer from the remote tank to engine tank can be dissallowed.
why dont ya do some forum searching, then lay your system out on paper and understand whats going on with the oil system.
it actualy works very well if well maintained.
right after you do your coures, I enroll for spelling and keyboarding.
we will call it a wash.
the actuall injection on your engine is a mecanically driven pump.
has NOTHING to do with anything other than pump arm angle and engine RPM.

wow ok... sorry I ever ask any questions!!!! ... didnt realize this was a place that someone couldnt ask a question they didnt know the answer to... just trying to undstand what you were saying and what the symptoms and results were

 

[rodbolt]

Re: 1991 twin 200hp yamaha percision blend

sorry if a buggaed ya, but I did get your attention.
once again the oil ingection on all yamaha oil injected motors in the US market is a simple crank driven mechanical pump that is gravity fed from a tank above it.
the pump arm angle,controled by the angle of the throttle, and engine RPM are the only two things that control oil into the engine.
if your seatrial goes well expect to change the water pump,t-stats,pressure control valve grommets, drain the engine oil water traps and change the remote oil tank filters at a minimum.

 

[woodworker2001]

Re: 1991 twin 200hp yamaha percision blend

Thanks... The water pump impellor was new last year.... I am not sure what t-stats are... Can you provide me some more information? I assume the water traps are not terribly hard to drain and the filter you are talking about ... is that the screen in the bottom of the tank I have read about that can get kind of slimey and clogged?

 

[rodbolt]

Re: 1991 twin 200hp yamaha percision blend

trust me, if you buy it start a fresh maint cycle.
never trust a seller.
I do this for a living and have for longer than I care to disscuss.
the remote oil tank has a tiny inline filter that can and wil cog, located at the tank outlet.
the water trap is the vynil tube on the engine tank.
be carefull, DO NOT pull it off, use needle nose pliers and PUSH it off.
t-stats are short for thermostats.
each V6 engine has 2.

 

[woodworker2001]

Re: 1991 twin 200hp yamaha percision blend

trust me, if you buy it start a fresh maint cycle.
never trust a seller.
I do this for a living and have for longer than I care to disscuss.
the remote oil tank has a tiny inline filter that can and wil cog, located at the tank outlet.
the water trap is the vynil tube on the engine tank.
be carefull, DO NOT pull it off, use needle nose pliers and PUSH it off.
t-stats are short for thermostats.
each V6 engine has 2.

Thanks for your help and advice... I am sure I will be back if I do purchase these

oh yea... what should the compression be

Dan

 

[rodbolt]

Re: 1991 twin 200hp yamaha percision blend

from bank to bank, within 10 PSI of each pair.
1-2 3-4 5-6.