F70 Yamaha, how many hours are possible before major rebuild?

[SpearTub]

Looking at a small tender for diving that has had 1400 hours, but serviced regularly. Im not use to so many hours with 2 strokes, so Im wondering at what point something like a gasket is inevitable no matter how well its serviced?

 

[saltchuckmatt]

Looking at a small tender for diving that has had 1400 hours, but serviced regularly. Im not use to so many hours with 2 strokes, so Im wondering at what point something like a gasket is inevitable no matter how well its serviced?

I knew an owner of a Yamaha/Evinrude/ Grady White dealership and he said when he was at a dealership could convention he was boasting about how he had a customer with 8500 hrs on a four stroke yamy. Next thing you know everyone was boasting about a customer with lots of hours one even claiming almost 11,000.

I went online and asked some pros how many hours people were getting on their etec's and I was told commercial guys were getting 7000 hrs before exchanging them.

When I go online and ask Google it says like 1500 which I disagree with.

Obviously where it's used and how it gets used tells the story. Idling hours and salt etc.

 

[SpearTub]

Obviously where it's used and how it gets used tells the story. Idling hours and salt etc.

All very true, he has 5 years of service history, 100 hour services never missed. Just incredible the Yamaha 4 stroke. I thought the 2st 3cyl which I know inside out was bullet proof.

Still, without much 4st experience my worry is its likely to need some form of rebuild if not just a gasket fairly soon.

 

[saltchuckmatt]

All very true, he has 5 years of service history, 100 hour services never missed. Just incredible the Yamaha 4 stroke. I thought the 2st 3cyl which I know inside out was bullet proof.

Still, without much 4st experience my worry is its likely to need some form of rebuild if not just a gasket fairly soon.

You never said the year....

Motors like to be used mostly, everything stays pliable.

Compression check sounds in order.

 

[SpearTub]

You never said the year....

Motors like to be used mostly, everything stays pliable.

Compression check sounds in order.

Oh yes my bad, sorry, its 2014. Yes compressions are all there, there abouts like normal.

I guess what Im doing is sounding out am I running a huge risk of being stuck with an engine that could just seize, or, can the Yamaha 4 strokes do such high hours with not too much worry pending car taken etc?

 

[saltchuckmatt]

Oh yes my bad, sorry, its 2014. Yes compressions are all there, there abouts like normal.

I guess what Im doing is sounding out am I running a huge risk of being stuck with an engine that could just seize, or, can the Yamaha 4 strokes do such high hours with not too much worry pending car taken etc?

Always a crap shoot but everything sounds good and being 2014 pretty new.

If your a nervous Nelly, buy new with a warrenty.

Good luck.

 

[SpearTub]

Always a crap shoot but everything sounds good and being 2014 pretty new.

If your a nervous Nelly, buy new with a warrenty.

Good luck.

More wanting to know how normal those kinds of hours are for 4 strokes, Ive bought plenty of older 2 strokes with unkown hours and serviced them myself. But 4 stroke is new to me. We have just got to the point here of them being mainstream new, but anything sub 50hp strokes are still sold here.

The engine sounds fantastically reliable if they can do such hours without total rebuild. I would prob only add 300 hours max to it. I could ask the mechanic if its good for another 500 or so as far as he can see etc.

 

[stresspoint]

use it or loose it is my moto with yammy F 4 strokes ,iv pulled a few apart with corrosion in the head and engine block where the head gasket is the weak point , also a couple with corrosion on the lower exhaust port .
all these motors were low hour for age .
1400 hours on a 2014 motor , go for it , flush good if you intend on leaving it sit , otherwise run that thing hard , it will love you .

EDIT : i have lots of dead parts offerings on my shelf to the gods of destruction .
most of the F series yammy parts are user induced not from reliability issue.

to answer your question , how long is a length of rope ...

 

[Scott Danforth]

Looking at a small tender for diving that has had 1400 hours, but serviced regularly. Im not use to so many hours with 2 strokes, so Im wondering at what point something like a gasket is inevitable no matter how well its serviced?

should be able to get 5000 hours on a motor with proper maintenance

1400 hours is just getting broken in.

 

[racerone]

A lot of it depends on what type of hrs are on it.----Full throttle in smooth water , trolling in smooth water.----Trolling in big waves.----Full throttle in rough water.-----All make a difference.------Like buying a police vehicle with 100,000 miles on it and 2000 hrs of idling time.

 

[SpearTub]

A lot of hours I admit are slower trolling type speeds, but some are flat stick full revs. Is slow trolling speeds bad for a 4 stroke?

Was used as a sailing chaser boat in GP.

Thought it was the 2 strokes that gummied up at slow rpm. But then its also been used at high revs as those GP sailing can go bloody quick when the wind picks up on their foils, but never abused, and ALWAYS serviced as per schedule.

Comes with a Boat package, the asking price is a fair bit less than the engine price new. So essentially getting the boat and trailer as a bonus.

 

[SpearTub]

should be able to get 5000 hours on a motor with proper maintenance

1400 hours is just getting broken in.

Its a support boat so they are doing low revs half the time and smooth cruising the other time. Works out about 140 hours a year, consistently which is important. There are no known issues its serviced as per schedule I think 5000 is highly possible.

Its not the spearfishing Tub I want it to be but add some gun racks, a Targa top with drop down clears, it could end up exactly what I need.

Its a much bigger LOA than the other boat Im looking at, but its nicely towable and will get me much further out than the other boat.