Yamaha Problems

[webby]

Have a 130 yam, done 200hrs. Since the motor was purchase brand new, it has been serviced regularly by two southside yamaha dealers.
Have also had dramas with the heat sensors, once under warrently (they were replaced), the second time late last year . This too was supposely rectified by a Yamaha dealer.
Well last monday they went off again, but only when doing 4000rpm +, so crusised around on 3500rpm and no dramas.
So boat goes in wednesday differnet dealer again, some of the dramas they found were caused by sand in the water pump, but this was not the sole cause of the problems.
So they advanced to the thermosats, and it seems the guts had been pulled out of them, but by which of the two pervious yamaha dearlers i had used cannot be proven.
Now came the big dramas, they pulled the head off one side, to check further, and found the head ports were chock a block full of this gooey silicone type substance, which was blocking water flow and also effecting the sensors.
When asked how i flushed the motor out, told them with fresh water first through the self flushing system on these motors, then ran a quanity of Macks Flush through the ears, to finish off the flush, the flushing ran for some 15min plus.
they said they had never seen this stuff clogging the heads up before, and suggested it could be the macs flush reacting to the salt through the ports.
This substance is going to be 'Tested' to verifty if the Macks Flush has been causing all the dramas with the cooling system.
$1000 dollars later, and a container of gooey stuff, my rig is back.
Stay tuned if all these dramas have been caused by the Macks flush, if so and others are using it, what is it doing to your motors also.
regards

[clutter]

Webby,

Regardless of the outcome of the Mack's, I'd be writing a letter to Yamaha Australia and telling them the story also as far as the thermostat goes. Pity you can't identify the culprit though.

Clutter

[Heath]

One of them Yamaha dealers wouldn't have been on a corner would it & the other named BOB

Webby,

When I had issues with our 70hp a few years back, when it was pulled down there was no salt build up what so ever in the donk. It had done about 400 hours & used at least once per week. Only ever flushed with fresh water using the muffs.

IMO these flushing agents or additives are a waste of money.

[Kerry]

.... the flushing ran for some 15min plus....

Apart from the other issues if that's 15 minutes on muffs/garden hose, ouch.

Both dealers probably should be considered at fault, one obviously doctored the thermostat and the other didn't mention the fact either.

Cheers, Kerry.

[NQCairns]

Mate thats a poor state of affairs, some motors esp the older ones have slits or holes directly above the rear of the cav plate that is the exit for thermostat water, so on muffs a person can visually see them open or not when the water starts flowing, possibly Yamaha kept up the tradition considering they were direct omc copy. Anyway i look forward to your advice re additives. nq

[webby]

I see the Professor of Technology @ Electronics from the Central Coast, quoted 15min + for flushing as "Ouch", with no remarks as to why this Ouch was stated, Why is this so and if i can humbley ask, what is your expert opionion to the flushing requirements. ??? ???.

Further to the findings, Brent at Yatala Yamaha, also took photos of the heads and the substance clogging them, along with photos of the remodled thermostats.
regards

[Big_Kev]

RAFLMAO at Webby and Kerry.

[Big_Kev]

What do you know.
I just read the flushing section in my manual and I realise my motor has one of the hose attachments for flushing the cooling system.
I thought it was a waterproof crankcase breather.
Guess I better laugh at myself now. (folks are dumb where I come from)
It says to run the water through for 15mins for thorough clean.
Doesn't mention the muffs bit.
Cheers Kev.

[bigbrian47]

is that 15 mins cold flush or with engine idling?
recently changed thermos in my 98 90hp jonno mechanic said
it was like new internally
i usually give it several minutes on cold flush then a few mins
running on either muffs or in a drum. motor is only used in saltwater cheers brian

[searaider]

Hi Webby ,
I can understand how you would be pretty pi#*ed off with the poor service .
I have got a new 150 HPDI Yamaha that has 40 hours up & always run it on the muffs for at least 10 minutes .
Even though it has the fresh water on the back of the motor I have never used it .
I always thought that you needed the heat in the water to breakup the salt buildup ?
I will be most interested to hear what the Gooey substance is .
Not trying to tell you what to do , but if it was me I certainly would be advising Yamaha of the slack service .

Peter
Searaider 2

[skippa]

G'Day Webby,

I was always told to run them until they were 'warm', as this allows the salt to be removed more efectively. I've got a 115 2s Yammie, and usually run her at idle on the muffs for about 10 mins max with fresh water only. She's only used in salt, done 326 hrs and still runs like new. (Thanks to Dons tune up).

I can certainly understand why your pis... following this thread with interest.

Cheers,
Skippa 8)

[Kerry]

Webby, most outboard fixers who have seen their fair share of impellor problems would probably tell you running on muffs isn't the most clever thing to do at all.

However in many cases it's the only way and with domestic hose pressure normally being what it is the less time on muffs the better and 15 minutes is way way over minimum time and even more so if anything (and that is anything above ~ 750rpm) above idle.

And ya don't even have to be a rocket sciencist to realize that a pump that can pump more water than a garden hose can supply (even at low revs) is going to probably have some problems, just that some will probably have problems sooner than others.

CHeers, Kerry.

[Hagar]

Webby
Interesting goings on with your motor for sure. Will be interested to hear the outcome of the findings on the gooey substance if you can post them here when you find out. I have been using Macs flush ( same brand ? ) since new and the galleries were clean as when I changed the thermostats recently. Will stay tuned.

Chris

[Lucky_Phill]

I suspect that Gooey substance is all those bloody ' soft plastics' being tossed around these days.

Yes, Brian, the results of all this will be interesting.

As Kerry says, at least the last Dealer you took it to is at fault.

Phill

[damons33]

the flushing system provided is better then muffs! look at the pressure of the tell tail! so in the manual it says to use the flush system for 15minutes- simple no noise no pissed off neighbours and a salt free motor! too easy