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12-10-2018 03:53 PM  7 months ago
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datidun

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N Ireland

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Yamaha outboard engines
Hi guys, anybody have good knowledge on the run in period on a new Yamaha outboard motors,done 6 hours on the new 30 hp but the manual says 10 hours and the service book says 20 hours, did research online and that says 10 hours,so I phoned the boat dealer and he says do what the service book says, Im a little confused as to why the manual is incorrect.
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12-10-2018 05:29 PM  7 months ago
spaceman spiff

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Tucson

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Not suprizing that there are different opinions about that subject. Folks argue endlessly about it. For most of the engines i played with; Jet ski, automotive, planker, or Heli, i always took more care than most folks. For example on little nitros i used a little extra oil, preheating with a hot air gun for the first start up,, Other folks just set the needles a little rich, and go fly. I always felt i was getting better results out of taking a little more care.

My work mate who does a lot of fishing, says he just stays off the throttle for quite a while. Gradually increasing throttle as the hours are on it. Not sure precisely what that means, but i think he is going for more gentle longer break in than most.... On the other extreem, most Jetski folks drop their new toy in the water, and hit it hard from minute 1.
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12-10-2018 06:46 PM  7 months ago
Lotus7

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From a race car ( I had my share of Yammie 30's as well) perspective , the major item that requires run in , are the piston rings and cylinder walls
Main thing there is not to let it idle , rather blip the throttle to get compression on the rings . Get some temperature going then run the boat at variying speeds, accelerating then slowing down etc
Works well on our pencil( twin pontoon) rubberduck engines. After proper run in , they can flatout for hours flat out -
https://www.trans-agulhas.com/
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12-10-2018 08:24 PM  7 months ago
datidun

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Yes I have done the various speeds but my question is do I change the oil after the first 20 hours on the Yamaha 30 hp as per service book or per manual?
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12-10-2018 08:36 PM  7 months ago
spaceman spiff

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This might help a little?

Watch at YouTube

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12-10-2018 09:53 PM  7 months ago
datidun

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N Ireland

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Thanx, Im still not sure, in the beginning he says 10 hour run in and then halfway to 20 hour service,it looks like the break in is 10 hours and then after 20 hours change the oils.
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12-11-2018 07:14 AM  7 months ago
Lotus7

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datidun
I change the oil after the first 20 hours on the Yamaha 30 hp as per service book or per manual?
I would ,during the run in period, the rings are scraping against the honed cylinder linings and smooths off all ( most ) roughness caused by the honing
Those microscopic metal scrapings accumulate in the oil and this is what can /will cause wear on the bearing surfaces - be it rollers or shell bearings
The scrapings are so fine that the filter can't stop it all
Oil and filters are cheap, even quality oil
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12-11-2018 08:45 AM  7 months ago
datidun

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Thanks Boet, I think what they mean is the break in period is 10 hours as per manual, and then change both oils at 20 hours,not in use at the moment as its winter but idle the motor every two weeks for 30 minutes to keep things moving.
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12-27-2018 09:07 AM  6 months ago
lt1pwr

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Douglasville, GA

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2 years ago I bought a brand new 115 HP 4 stroke Yamaha outboard for my pontoon boat. The dealer told me the break in period was 10 hours. He said to avoid running full throttle during that time and not to maintain a set RPM for more than a few minutes at a time. I also had my first oil change at 20 hours. I'm currently at 110 hours and the motor is just a gem and hasn't given any trouble whatsoever. Can't say that about my old Mercury outboard! Hope that helps.
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