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Old 22 February 2009, 09:48   #1
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50 2-Stroke Break in

Proper break-in procedure on a new 50 HP 2 stroke Mercury outboard?

Do I go by what the manual says? Or is there another best practice?

Thanks,

John
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Old 22 February 2009, 14:25   #2
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John, I would follow what the manual says. Thats what i am doing while breaking mine in.
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Old 22 February 2009, 15:50   #3
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Depends what the book says. I would stick extra oil in and go gentle for the first 10 or so runs.
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Old 22 February 2009, 17:20   #4
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All I can say is that after breaking in my tohatsu 50 pre mix by the book , I wish i bloody hadn't ,
After the event and fed up with the contstant plug fouling a tohatsu mechanic told me that the extra oil causes problems and just isn't necessary when the engine is fitted on a light boat . I should have run it on normal 50-1 and just not hammered it or laboured it for a while ,

It seems the break in instuctions are to cover the motor on a heavy boat under heavy load
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Old 24 February 2009, 08:07   #5
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The other way of looking at this is:

~~~~~~6 months later~~~~~~~
"hello Mr mercury dealer, my new engine is broken and still under warranty"

"did you run it in according to the instructions?".......

You can probably work the rest of this conversation out, regardless of any engineering best practices!
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Old 24 February 2009, 09:17   #6
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Originally Posted by 9D280 View Post
The other way of looking at this is:

~~~~~~6 months later~~~~~~~
"hello Mr mercury dealer, my new engine is broken and still under warranty"

"did you run it in according to the instructions?".......

You can probably work the rest of this conversation out, regardless of any engineering best practices!
How the hell would they know???
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Old 24 February 2009, 09:48   #7
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Ian,

that is good to know. I haven't run it yet, but I have mixed my tank 50 to 1 along with the oil injection.

I will stick to what the manual says and from what I was told and give it a go this weekend. I might bring some extra plugs with me, or at least get the kicker ready.

John
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Old 24 February 2009, 11:29   #8
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How the hell would they know???
Usually, the consumer tells them.

jky
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Old 24 February 2009, 15:51   #9
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Ian,

that is good to know. I haven't run it yet, but I have mixed my tank 50 to 1 along with the oil injection.

I will stick to what the manual says and from what I was told and give it a go this weekend. I might bring some extra plugs with me, or at least get the kicker ready.

John
its a dilemma for sure . if its anything like mine was on double oil you will need spare plugs , possibly 2 sets , the motor was ok for the first hour then started missing . When the engine misfires it makes a nasty knocking noise unless the offending plug oils completely then all you will experience is a lack of power . Mine has only ever lost one cylinder at a time

I have to say the advice I had from tohatsu UK was for the pre mix motor used on very light boat like a zap cat , and it presumed you had some mechanical sympathy.

I was told that the build of extra unburnt oil tends to sit in a seal recess at the bottom of the crankcase and causes plug oiling after tilting the engine or hitting some rough water for some time to come . Its a real pain in the ass I just hope it clears itself out soon
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Old 25 February 2009, 06:09   #10
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How the hell would they know???
Quote:
Originally Posted by ian parkes View Post
the build of extra unburnt oil tends to sit in a seal recess at the bottom of the crankcase
.....and all the other things that might give the game away like shiny clean spark plugs scored cylinder walls and all the things that you run an engine in for to prevent happening! Assuming it's oil injection it also means if there is a problem with that (blocked oil line, air in the oil line, pump that got through the machine shop quality control when it should have been skipped) you just get an alarm as opposed to a siezed engine!


I think that's why after the first hour or so they allow a minute or so at WOT every so often. (your book of words will give the exact reccomendation). If it has the usual initial 1/2 hour or so at tickover, then launch and sit on the end of the pier enjoying your lunch as it ticks over. then stop, clean the plugs and carry on at half throttle or whatever they reccomend for the next stage.

Running in an autolube 2 -stroke is no worse than a low speed afternoon with premix!
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