Rebuild or replace
Printed From: The Fishing Website
Category: General Forums
Forum Name: The Boat Shed
Forum Description: Discuss all things boating.
URL: https://www.fishing.net.nz/forum/forum_posts.asp?TID=130747
Printed Date: 16 Jun 2026 at 9:40pm
Topic: Rebuild or replace
Posted By: Allmc
Subject: Rebuild or replace
Date Posted: 06 Apr 2019 at 11:08am
| I have just bought a boat with a 95 Yamaha 90 outboard, I have been told the engine is bad, has a knock and other issues. I am seeking advice on whether to rebuild the existing motor or replace with a later model similar size outboard. Any advice appreciated |
Replies:
Posted By: RC1
Date Posted: 06 Apr 2019 at 3:33pm
| Go brand new if you can afford it but dont buy another secondhand one. Rebuild what you have. 90 Yamahas are good engines |
Posted By: Allmc
Date Posted: 06 Apr 2019 at 4:15pm
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Can anyone give me an idea what a full rebuild is likely to cost ? |
Posted By: pompey
Date Posted: 06 Apr 2019 at 5:13pm
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[QUOTE=Allmc]Can anyone give me an idea what a full rebuild is likely to cost ? I have no idea but it won't be cheap and likely more than the estimate. I would shop around at new prices and then compare that with an estimate for a rebuild. Also, even with a rebuild the warranty will probably be a year compared to at least five with a new build.
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Posted By: Steps
Date Posted: 06 Apr 2019 at 5:59pm
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The big question is are your pockets deep enough to go new? I know ours where t when we 1st brought our boat.. Just waited around till a good boat and engine turned up. 2S Johnny 115 2004 full service record and about 250 hrs up.. After couple yrs wanted a little more reserve power..looking around 140 hp.. 4s cost not an option. Took just over 2 yrs to find a suitable engine.. Another johny older 2001 93 hrs V6 150 full service record from new and winterized each winter 9k not negoiable ( was a fair price at that) The person who brought my old engine also didn't have deep pockets full service history still about another 50 odd hrs up and fair price. Brought unseen. The excerise all up cost a nett 2k Excellent engines come up every now and then at fair prices.. They don't last long on the market. Take your time. And consider a little more power maybe.. Reserve power for chop, and pick up a bit more economy at slightly faster cruise speeds |
Posted By: ofthesea
Date Posted: 07 Apr 2019 at 7:04pm
| I replaced a '94 Evinrude 90 hp 2 stroke in 2016 with a new Yamaha 90 hp two stroke. I'm getting almost twice the fuel economy running at cruising speeds. Get a trade in deal for your old motor, get a deal for your new motor as it's coming up to winter, you won't regret it. New motor starts like a dream even after couple of months sitting. |
Posted By: OuttaHere
Date Posted: 08 Apr 2019 at 4:15pm
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The trade-in on a non-running 1995 motor is likely to be approximately $0, or maybe just a little above it if there's plenty of bits in good condition that could be scrapped from it. Rebuilding is unlikely to be economically feasible unless you can do a lot of the work yourself.
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Posted By: fritzhu
Date Posted: 10 Apr 2019 at 7:47am
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I'd suggest, if you were mechanically inclined, know your way around an engine and had access to the service manuals for your engine, you can rebuild it. It might cost a penny in terms of parts and the odd special tool, but nowhere NEAR having it done for you - and you can have the satisfaction of knowing that it was done right. However, if you're not the above, then I'd say buy a new one if you at all can. Outboards are worse than cars if you get a lemon - not just in terms of cost, but also because with a car you can, y'know, pull over and get out. If you can't buy new, see if you can find a shop who are willing to do a thorough pre-purchase inspection on any potential engine you buy. It will add to the price but will absolutely be worth it.
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Posted By: Big -Dave
Date Posted: 10 Apr 2019 at 5:39pm
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A harsh reality is that anything second hand is a gamble. I have often brought very cheap and factored in rebuild costs, then you know what you have. The knock in yours, have they did any more, is it a big end failure? ------------- you can't fix an idiot with duct tape, but it does muffle them for a while... |
Posted By: Steps
Date Posted: 10 Apr 2019 at 7:54pm
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As still don't know what boat it is.. Assuming being a 90hp original engine around the 95s..something like a 4.8 to 5.2m.. Around 1000kg fully loaded gross weight on the water. A 115hp 2 S around 2002 to 2008, around 250 to 450 hrs up.. Service record... Fair price around the $5500 /6000 for 450 hrs. And 7k 250 hrs Now keep in mind that these engines will see over 2000 hrs if we'll maintained.. Putting this into the real world, family boat and fishing with the m8s Head out from kawakawa Bay all the way upto gannet or over to the muscle farms, you will put up 45 to 75 minutes for the day. If you get out every 2nd weekend.. Which will be impossible cause there will not be enough weekend weather windows.. So at most may 10 trips.. That's 10 hrs per Yr.... And if the engine has say 300hrs and is a 2006.. That's 13 yrs.. 23 trips per year.. Or what most likely happened is the ign switch has been left on a couple times.. Grandchildren touching stuff.. There are a lot of poorly maintained, way over priced, engines around... And a good number fairly priced, damn good engines still in near new condition that don't last long on the market. I have no issues buying 2nd hand... With eyes wide open |
Posted By: Allmc
Date Posted: 11 Apr 2019 at 6:14am
| Thanks for all the advice, the boat is a V163 Haines hunter, I have still to do some investigation on the motor issues but will do. I will do the budget re brand new vs second hand. |
Posted By: Steps
Date Posted: 11 Apr 2019 at 10:19am
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90 nice for that boat 115 will give better economy max or slightly over powered.. You will get a far improved ride in chop with significant better economy Also since the115 will not be working as hard at cruise speeds, will be significantly quieter.. Normal talking volume. Down side.. Make sure by asking and visually checking everyone is holding on on take of... It gets pmon the plane very quick. Another thing.. If up grading, to the same make, check if controls, gauges, looms are the ssme/complatable with the old model. It saved a lot of time, and crawling around, when I went from the 2004 v4 Johnny to the 2001 v6. Everything the same except the face colour of the gauges... So kept the old gauges.. |
Posted By: Tagit
Date Posted: 19 Apr 2019 at 6:45pm
| You can bring a rebuild kit (pistons, rings, bearings, gaskets) into NZ for maybe $1300ish. If the bores are within spec you can just hone them and rebuild so maybe $250 in machine shop fees (not sure about that number). If you do it yourself or with a friend then even with the extras you should do it is probably a less than $2k job. If you get someone to do it I hues there is $1500ish in labour depending on a few things. So maybe $4k tops if there are no other parts required. I have heard of the Yam 90's having corrosion in the head or head covers so would check that before doing much else. |
Posted By: Tagit
Date Posted: 19 Apr 2019 at 6:48pm
Won't save fuel with the 2 stroke Yamaha 115. For whatever reason they are really thirsty when compared to other 115's. There are a bunch of old posts on here where guys were trying alsorts to get their fuel burn down. Good engines, but hard on fuel.
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Steps wrote: