Question about Yamaha Water Sport

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We have a 2006 Yamaha FXHO. I am a 54 year old woman who is the usual rider of this watercraft. When we took the waverunner out this year, it seemed to be losing power so I made an appointment with the area Yamaha dealer where we purchased and serviced our machine every year. The only service done was battery replacement on 2 occasions and winterization. When we first brought machine in, they started by replacing the plugs and broke one of the 4 plugs and had to get it machined out and have the head repaired. After getting it back they put new plugs and adjusted in accordance with Yamaha Specs. Machine still didn't run correctly.They contacted Yamaha Service techs @ Yamaha and were told to check several different things which they did but to no avail. During one of the test runs they discovered something wrong with new spark plug and when the opened the head again found that one of the cylinders blew and also caused damage to the head. I firstly cannot understand why this would even happen on a high performance engine especially since I live in the Northeast and our season at best is 2 months long and I use it on weekends ONLY. This machine ultimately has only about 8 mos of useage on it I would also like to know if I have any acceptable argument with Yamaha relative to getting them to cover any or all of the repair that is required. I have gotten estimates using aftermarket parts and they are ranging from $2000.00 up to $3700.00 which is ridiculous when the machine has a value of only about $6000.00 Also, could any of these problems been caused by the fact that the spark plug broke when they took it out and we had the head repaired? The repairman have indicated that there is evidence of corrosion....How is this possible on a sealed engine??? Something just doesn't seem RIGHT about this whole fiasco! Hope to hear any kid of promising news from someone! Thankyou for your time Mary E. Ardan T

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  • meardan Oct 04, 2010

    Dear Sir,
    The question I have is whether this is something that SHOULD happen with so few hours on it and if maybe there was a defect with the engine for this to happen. How does a sealed engine show
    evidence of corrosion??? Is there something additional that we need to be aware of? After all, this
    IS a watercraft meant for useage in water...
    Mary Ardan



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If the machine is out of warranty (usually one year) Yamaha is not responsible. If the dealer broke the spark plug hole and did not fix it correctly or that is the source of the later problems, they may have some liability . On dealer repairs parts are usually covered by a 90 warranty. If you buy a part and install it your self your warranty is usually 30 days on the part. Are you fortunate enough to have an extended warranty? For the price they are asking for the repair , you could send your motor to SBT and have the motor completely rebuilt for $2300 plus shipping. A lot of dealers do this. I am sorry to hear about your troubles . I hope there is something here that helps.

Posted on Oct 04, 2010

  • David Belcher
    David Belcher Oct 04, 2010

    The only thing I can assume is that originally the spark plug hole was cross threaded and stripped by the mechanic or some one who changed the plugs. It is not common to have a problem like that with a new machine. If the cylinder head had a manufacturers defect during the warranty period Yamaha would fix it for free. If the dealer had made a mistake they should have been willing to fix the problem. How they fixed the stripped spark plug hole is critical. They should have removed the head for the repair so debris would not end up in the cylinder (the probable cause of the piston damage). It sounds like something was left in the engine or fell into the engine and may have been the cause of the problem. There are two sides to every story, with out all the facts it is hard to know exactly what has happened.
    As to internal corrosion to the motor, all watercraft come with an owners manual. In the manual they recommend flushing the engine with fresh water after using the watercraft. I live in the midwest and this causes confusion with owners here. You really only need to flush the engine after riding if you are using your watercraft in salt water (the ocean). Not flushing the motor and engine compartment after riding in salt water can cause massive amounts of corrosion in the motor and engine compartment mostly because of the light weight materials used (aluminum). If you only ride in fresh water you do not need to hook up and flush the motor , no harm will happen from riding in fresh water it is not as corrosive as salt water. Corrosion in the water jacket (cooling side of the cylinder) would not have an effect on the internal side of the cylinder (scored piston side). Though water ingested through the carburetor would effect the cylinder. Probably all of them , not just one. Internal corrosion in a motor tends to be related to care of the boat after riding and in the type of storage done in the off season. Before operating any motor vehicle, car, motorcycle, boat, etc. it is the users responsibility to read and understand the owners manual and correct operating procedure for that vehicle.



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