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Message Subject: 25hp Johnson rebuild.

bobtodd

Posted 2/6/2010 6:20 AM (#422003)
Subject: 25hp Johnson rebuild.

Posts: 337

Location: Central WI

I've got a late 70's/early 80's 25hp Johnson that has started to get a knock/vibration. The thing starts and runs like a champ, but it's losing power and the vibration is getting worse. I'm assuming the powerhead needs rebuilt or replaced.
Just wondering on cost of repairs vs. going out and buying a different outboard. I thought about digging in and trying to do it myself, but it looks intimidating when I pull the motor cover off..lol. Anyone ever do any major overhauls on something similar or have an idea on costs to have someone repair it? Thanks!

VMS

Posted 2/6/2010 7:55 AM (#422006 - in reply to #422003)
Subject: Re: 25hp Johnson rebuild.

Posts: 3508

Location: Elk River, Minnesota

Hiya,

With the age of the motor, I would assume you would spend more on a rebuild than what the motor is worth. It would be a fun job, though and to do it, you'd want to find a service manual for the engine, which is not too hard (ebay). It does look intimidating, but in actuality, the engine design is not all that complicated.

My guess....with the age of the motor, I think you could either put the money you would have used on a rebuild could get you part way into a new motor or a very nice used motor... A good used 25hp that is still 2 stroke I would think you could find for around $1500 or so, if not less than that.

Steve

bobtodd

Posted 2/6/2010 11:22 AM (#422037 - in reply to #422003)
Subject: RE: 25hp Johnson rebuild.

Posts: 337

Location: Central WI

I decided to look around and see what it would take to pull everything apart, and ended up finding a broken bracket or brace that was cracked. This might be the cause of my vibration???
Hopefully I can get a new bracket and that will fix the problem. I'm just hoping I didn't loosen anything up running it like that last summer.

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4amuskie

Posted 2/6/2010 8:01 PM (#422111 - in reply to #422037)
Subject: RE: 25hp Johnson rebuild.

A good alum welder can fix that up for you

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