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Old 21 September 2017, 13:36   #1
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Break in - how much is really necessary ?

Hi there
Bought a new two stroke Tohatsu 50 - manual says 10 hours break in period. That sounds like a drag - 10 hours where I need to be calm and enjoy prolonged periods (15 mins at a time) of puttering along followed by a few mins of full-blast? - Hmmm - honestly not something I'm looking forward to.

10 hours seem like a looooooong time. I am aware that the manufacturer wants to cover all bases and avoid costly claims - however, what could be a reasonable period?

I do understand the need for warming up, letting things settle in - but 10 hours ? -well, you get the picture.

Any experience ?
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Old 21 September 2017, 13:46   #2
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It might well be fine, but how would you feel if it went bang at 8hrs and you hadn't followed the process or if at 30 hrs a warranty claim was rejected because the ECU data didn't have enough low revs time in it... (i'm not sure if your ECU actually has that, or how else they might show it was abused).

However FWIW I didn't find the break in period too hard. Some short periods of high revs get you on the plane and then you can back off and keep it up there (not working the engine hard).
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Old 21 September 2017, 13:47   #3
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The outboard maker will know far more than anyone on a forum, break in period is there for good reason.
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Old 21 September 2017, 14:19   #4
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Yep do as it says as it pays in the long term. I know your frustration having bought a new Merc 150 two years ago and having to do the ten hours seems long but my advice is the get it over with as quickly as possible.
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Old 21 September 2017, 16:49   #5
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if it was me I would probably crack on and not bother about breaking in at work nothing ever gets broken in and the stuff does 20-30000 hrs before needing rebuilt same with 2 strokes like chainsaws they never get broken in I think its a load of bollox if the engineering is that marginal that you've got to piss about for 10hrs its a poor show from any manufacturer
anyway cue the backlash who's first to want me hung for this
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Old 21 September 2017, 18:18   #6
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I'll go first then! It is far from bollocks, the rings need to seat in with heat cycles and the reason for the varied throttle is to do exactly that.

Chainsaws or the like are very different animals as they rev much higher with more oil so the ring seating is much quicker. Although the quality of Chinese built engine rings is sometimes questionable anyway but one for another time.

With my 2 strokes in my planes (50cc up to 200cc) I normally set the ring gaps myself as it makes a massive difference to the compression.
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Old 21 September 2017, 23:38   #7
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Isnít it usually an hour or two of puttering then several hours of not running around at full speed? Iíve broken in two engines and it was no big thing. Also fortunate we have some good big lakes around.

Kind of a big investment to do your own thing but your call.
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Old 22 September 2017, 02:21   #8
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Quote:
Originally Posted by dubrus View Post
I'll go first then! It is far from bollocks, the rings need to seat in with heat cycles and the reason for the varied throttle is to do exactly that.

Chainsaws or the like are very different animals as they rev much higher with more oil so the ring seating is much quicker. Although the quality of Chinese built engine rings is sometimes questionable anyway but one for another time.

With my 2 strokes in my planes (50cc up to 200cc) I normally set the ring gaps myself as it makes a massive difference to the compression.
thats a different thing altogether we are talking about mass produced stuff with preset tolerances replicated in thousands not hand built where the tolerances will be tighter because your trying to eek the last little bit of compression out of it was the correct running in done on your Suzuki?
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Old 22 September 2017, 02:25   #9
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A good day out in some sheltered water, big flask, warm clothing & plenty of sandwiches will get you 10 hours. I ran in my DF140 in a day.
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Old 22 September 2017, 05:56   #10
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I suggest the OP does exactly as he wants, now that he has the information of what could happen if there was a claim later down the road.
Personally, I would go out early one day, full tank fuel, and potter around then do a few cycles as per the instruction book, and make sure I hit more than the 10 hours.
But it's your call !
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