Well if you have been monitoring the Yamaha board you would know alot of people have been having problems with maintaining their RPM's. My boat is new this year and I just passed the 45hr mark. At 44 hrs I noticed the boat was sputtering and then I would die down to 4500rpms. When I first run it in the morning or when it has sat for an hour or so while I casted it would take off strong then again die down. I was puzzled...... My first thought was spark plugs, so I pulled them, and low and behold they were filthy, actually had chunks of carbon built up on them. So I replaced the $7.50 a piece plugs, then ran the boat with high expectations, F*$(*%ng piece of Crap...... thats what I screamed....
I took it this morning to my local Yamaha service station, they said park it, and we will start looking at it on August 22nd... WTF! Two weeks to look at it, two weeks to fix it, two weeks to call me and tell me it's readyI know how it goes....
I decided to try something sort of sneaky.... went and talked to the tech. HE remembered me from past visits, don't know if that is good or bad, he walked out and looked at it with me, and I explained the symptoms. Right away he said you have something in your VST. He said the particles drop when it sits for a while, then they get sucked up into the filter. He says "Eric you can fix his yourself if you want, besides this isn't warranty work, Yamaha will say something was in your gas, or gas tank". He then explains to me how to do it. I remembered the post on the Yamaha board about changing out the fuel filter in the VST tank. The one with the pictures...... Well, I just got done doing it, total time was about 1/2 hr, and yes there was a bunch of black crude, or dust in the bottom of the tank. I have not run it yet, it is raining out right now, but I am watching the weather and will be heading to the bay here shortly to see, but I honestly think I got it. '
He told me if I had a pre-filter (raycor) installed this would not of happened. He said this is the big down fall of Yamaha versus Merc. He said yamaha's on board water seperator doesn't do a good job of filtering out this fine enine dust, it just barley helps seperate the water. He said if I had yamaha's pre-filter, or a raycor installed from the get go, I would have never had this problem. Sooo.... I just bought one and will be installing it, this next weekend.
Point being, if you don't have one, it only cost $40. Looks like to a half way mechanically inclined person it will take about 1/2hr to fully install. That is super cheap insurance to prevent what just happened to me. The gasket I had to buy for the VST tank cost me $35 as it is, spend the extra $5 and get the preventative maintenance, I highly recomend it, you might not have a nice mechanic as I do.
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