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Old 02 September 2013, 16:32   #1
henryfreston's Avatar
Country: UK - England
Town: Thornbury
Make: Avon Searider 4m
Length: 4m +
Engine: 50hp tohatsu tldi
Join Date: Sep 2012
Posts: 648
Life expectancy of a 4 stroke

How many hours would be acceptable before it needs a rebuild for a 40hp fuel injection 4 stroke? Just spotted a 2010 with 1,300 hours on it, seems quite a lot for such a young engine?

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Old 02 September 2013, 16:36   #2
Country: UK - England
Town: Plymouth
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Depends, if its been used commercially chances are its had 14 services too. If used on a leisure basis its quite a lot for an engine of that age.

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Old 02 September 2013, 17:43   #3
Country: UK - England
Town: Gillingham Dorset
Boat name: Green Marlin
Make: Quickilver
Length: 5m +
Engine: 90hp Mariner
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Its the equivalent of 40k on car/bike engine
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Old 02 September 2013, 19:17   #4
Country: USA
Town: Miami
Boat name: Make Offers
Make: AquaScan
Length: 7m +
Engine: 275HP Verado O/B
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Join Date: Mar 2012
Posts: 12
Send a message via Skype™ to MIAMI
Four Stroke Lifespan

Personally when I first started recreational use 6 years ago...

"100 hours" sounded like alot.

and then I became educated talking to mechanics and noticed...

"1000 hours was alot"

and after being a commercial user and speaking with daily livelihood users on a frequent basis...

"5000 hours" is alot

Law enforcement and tow operators easily put 3000 hours on a set in a year...sometimes they swap out every 1-3 years.

Difference is: They HAVE TO MAINTAIN THEM in order to extract that lifespan and its always built into their budget.

Can you do the same and extract the life out of yours?

I sincerely say that If I use it daily, I do not flush it. Occasionally, I use Salt Away to rid the cooling system of excess salt when I have forgotten to flush regularly....I know, I know cardinal sin. ..

But the 100 hours gets done and thats the simple 2 part key to keeping them running....flushing and service.

BOnus points if you use an additive to remove carbon:
Yamaha Ring Free
MErcury Quik Kleen

Thats the saving grace...removing carbon buildup from the motor.

This is hours of dock talk and wrench wisdom condensed into one post....

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Old 03 September 2013, 02:12   #5
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Country: UK - Scotland
Town: Fort William
Boat name: Red Mist
Make: Northcraft 5.8
Length: 5m +
Engine: Suzuki DF 140
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Posts: 2,059
A pal of mine uses a Cheetah Cat with twin Honda 120's on it for creel fishing, I was out with him last year and his engines had 3.5k hrs on them, he still has the same setup, I would hate to think what hours are on them now.

He has them serviced when due by a Honda dealer, he's never had any bother with them.
There is a place on this planet for all of Gods creatures.........right next to my tatties and gravy.
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Old 04 September 2013, 09:19   #6
Country: UK - Scotland
Town: Glasgow
Boat name: snagglepuss
Make: Shetland
Length: 6m +
Engine: 90 hp Outboard
Join Date: Nov 2011
Posts: 562
we see yams and honda;s with 5000 + hours them but as others have said they do get serviced as required.
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Old 04 September 2013, 10:53   #7
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,618
Originally Posted by MIAMI View Post
BOnus points if you use an additive to remove carbon:
Yamaha Ring Free
MErcury Quik Kleen
I use Ring Free on occasion (probably not as often as I should); I assume Merc Quik Clean is roughly the same; the only Berryman's I'm familiar with is the spray-on carburetor cleaner, which would be a different animal.

Are you talking about a Berryman's fuel-delivered cleaner or what?


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