Yamaha outboard trouble

[Mr. Sandman]

Could this problem be be reduced by changining the RACOR filter more often? I noticed some sludge like crap and some water in there during a 100 hour oil change. I change the RACOR filter now with each engine oild change and have drained it from time to time just to make sure there is no buildbup, it only takes a minute. One questionable take of fuel and you are in for problems. It really does not take much gunk to screw up a carb or injector.

[Basstime]

Drain fuel/water filter. Run engine directly off a 6gal. tank with fresh fuel thru the Racor fuel/water separator. Should'nt be any water in filter. If this solves problem then check your fuel tank. I have a 1989 C-Hawk w/90 hp Yami. Had gas/water in filter(Racor). Engine would sputter. Get it to plane and problem would smooth out until water built up again in filter. I changed filter, gas lines ,hose fittings, tweeked carbs.etc. No luck. Because my deck was a little spongy, I decided to rip it out. Upon inspection of the foamed in place 50gal tank, I discovered 3 holes in tank caused by corrosion. Emptied about 5gallons of water from tank. Foam was saturated with water and gas. Will be installing new plastic 36gal tank(no foam), a new stringer and new deck this spring. Hope this helps you. TK

[macojoe]

How many hours on it?? Yamaha's love to get Carboned up! You can get some De-Carb and do it yourself.

Also try like stated above get a 6 gal gas can and run freash gas and see if that is it. If runs good you may have a hole in the line letting air in or a O ring on the conector's of the hose?

Could be out of time also?? I had a friend that had one and it was fine at idle and troll, but do try to go anymore then that, it will spit all over the place!

Good Luck!! Let us know what it was??

[Young Salt]

Well he got the engine back from the latest mechanic. He said the bar that links the three carbs was bent (How that would happen-who knows?) and the middle carb was sticky.
He gets the boat back and the spit & spudder is gone, but the plugs were still loading up after about 15 min.
Engine is now going back to same mech. to replace middle carb and rebuild the other two.


He tried the decarb and normally runs 6 gal tanks.

[macojoe]

Do they still have points in there?? I had a old Johnson that would foul the plugs every trip, One set of points under the flywheel was bad, after that everything was great!!
Found this right after a carb rebuild that made no difference.