Written on: 27/08/2016 by xyMurdock463 (1 review written)
I have had this motor for three years. If you leave the vent on the gas tank open, water WILL get into the gas. When that happens it may run, but at low speed and only with the choke wide open. The only way to resolve this is to drain the gas tank, and put in water free fuel, then try to run it long enough to purge the water from the carburetor. This can take from five minutes to an hour. It is amazing that this motor does not have an accessible carburetor drain screw. Ir is also amazing that… Read Full Review
Written on: 14/09/2015 by Warrenx392 (1 review written)
I have this engine, bought new, still under warranty. The foot had to be replaced because is was leaking and it burned the clutch. Never worked properly. When you close the choke it stops. if you leave it open the revolution goes up then down then up.... I was told that it was the fuel but it was discarded after checking the fuel. The last potential reason or excuse is that the carburator is broken or dirty and this after less than 10 hours in 2 years of operation. If I would have known this I… Read Full Review
Written on: 02/02/2015 by CaydenBentley159 (1 review written)
The engine can't be relied on at all. Not easy to get going and stalls easily even when warm. I have had it from new and it gives my no confidence at all. I have had it serviced and use clean fresh fuel all of the time… Read Full Review
Written on: 26/02/2014
Has been a good performing engine. Does well on a 10ft porta-bote although a slightly bigger HP engine would give better performance with two people in the boat. But I prefer less weight and can't expect 4HP performance from a 2.5. I've seen cheaper engines but you get more plastic with them and this model seems to be rugged. I have had no starting issues with this engine. Like any small engine, always run out the carb gas as much as possible. About one quart fills the tank and chances… Read Full Review
Written on: 24/07/2013 by Bag_E_Puss (1 review written)
The Yam worked brilliantly from brand new and while we were on old petrol/gas formulations (without bio-component). Hovever since fuel now has bio-component in it, despite all my efforts to drain fuel out of the carbs before storing it, and using stabilisers, the Yam fails to start 75% of the time, until I clean out and rebuild the carbs. That in itself is tricky because five or six carb items are held together with two bolts, and I've lost parts overboard. Horrible to service. I can send to a… Read Full Review
Written on: 01/05/2013 by Mainah1965 (1 review written)
I have a 2004 2.5, which I use for trolling on my square stern Discovery. This engine has never failed to start on the first pull. I practice regular maintenance on it, put it away properly for the winter, and have had 0 problems. The efficiency is astounding as you can run most of the day on a tank of gas (less than a quart). It is very quiet, burns clean and idles perfectly. The only negative is the weight but it's a 4 stroke, not a 2 stroke, so that's the penalty… Read Full Review
Written on: 11/03/2013
Carb problems, carb problemsd carb problems. Unreliable poor starter when it starts at all. Under one year old useless warranty dealer always looking for easy out to escape warranty claims. canopy does not fit and springs off engine. I have had 4 yamaha engines the two strokes were great the four strokes are junk and best avoided… Read Full Review
Written on: 23/10/2012
Bought the 2.5 in Sept, 2003. Have put many hours on it running up and down the Ocklwaha River (Florida) in a 15'4" Gheenoe. We can get 8 mph in still water. Very stingy on gasoline consumption. Overall it is a good motor, but I still wouild rather have an old two-stroke 3 hp Evenrude or Johnson. Many users report rough idle. Mine runs rough at idle (usrges) Choke speeds up rpms, but does not stop the surges. At high speeds surge not noticeable. Rough at idle when brnd new… Read Full Review
Written on: 10/09/2011 by markbarker (1 review written)
Carb.rebuilt once carb.replaced 2 times Towed off lake 2 times paddled off twice did not start 3 times. Called yamaha customer service no reply called again no help. called boss of customer service 3 times no reply.That was last year.this year would not start took it back PAID 96.00 put the motor in back of truck drove 8 miles stoped at Tims for coffee a pint of oil on floor and all over Golf bag. Dealer offers to buy motor back for $500.00 I wish I had My 1982 merc.4 HP back it run… Read Full Review
Written on: 26/09/2010 by 223ss (1 review written)
These outboards are not capable of sustaining a consistent idle speed when trolling. They go from a correct idle speed, to really quick and then suddenly drop revs so dramatically that they stall! They run OK at speed but are pretty noisy. Fuel economy is not much better than a 2 stroke. Had I known this outboard would not idle consistently I would not have purchased it!… Read Full Review
Written on: 13/11/2008
For a four stroke the fuel efficiency is poor and motor is loud with the Yamaha 2.5 HP four stroke outboard engine. There should be a better oil level indicator. Starts easy.
Instruction labels for operation and storage well marked.
Gas shut off and tank valve work well.
Low fumes and emissions.
This engine is quite heavy and noisy as its a real gas guzzler… Read Full Review
Written on: 25/04/2008 by Mulderick (1 review written)
Overall this is a great engine, no vapors, strong for its size and very light weight. I was considering other engines but this engine fell right in the middle with its price point. It is replacing a 2 hp Honda… Read Full Review
As rated by our community of reviewers
" Water in gas a huge problem with Yamaha 2.5 hp four stroke " Read More
" Great low cost engine, they require a fair amount of maintenance bu... " Read More
" EXCESSIVE REPAIRS " Read More
I've had this little "gem" of a motor for almost two years.
I purch... " Read More
" Great Engine " Read More
Written by DaveCokayne