Need assistance with Yamaha outboard

[Brian D]

I have an '95 9.9MXHT on my boat and I need to remove it to service the cooling system. I think I have mentioned this before. I cannot see how to remove the linkage between the outboard controls and the motor. I have the owners manual and a Clymer Shop Manual but neither discuss this topic.Here is a photo of the linkage. Not sure what to do here; pull, push, slide, lift.Can anyone assist me with the procedures for removing the control cables from the motor? Thanks millions.

 

[larry w]

outboard

It would appear that you need to back off those lock nuts and unscrew the control rods, but what are you trying to do with the cooling system? Desalt it? If so, put the lower end into a large bucket with a solution of water and couple of quarts of vinegar and run the engine. (You know, of course, that outboard cooling does not cool the cylinder walls or the head, but merely the lower part of the exhaust) Leave the water/vinegar solution in place overnight, then flush with water. The vin will dissolve salt deposits.

 

[Rick Webb]

Looks Like a Clip

That stainless part looks like it will flip up and maybe it will release that way.

 

[Joe]

call the yamaha repair shop...

and ask the technician how to disconnect the throttle cable... I would not think you would have to unscrew that nut, because most outboards,of the portable variety, are designed to be disconnected without changing the settings. On my Tohatsu the link end fits over a ball attached to the throttle lever itself. There is a sleeve that slides back to release the ball. This allows you to remove without changing the settins.Again, call the mechanic.

 

[Brian D]

Larry W...

In order for me to remove the motor to work on the cooling system, I have to disconnect the throttle and shift rods. This black couplers with the silver-ish clips are what keeps the rods connected.I didn't know that vinegar could dissolve salt deposits. Salt Away does the same but I have to have some kind of water flow thru the system to get it going. I don't want to run the motor without a stream of water coming out. I guess I could run it for short spurts to see if I could get enough solution in the cylinder head to clear it. Hmmm...I know we talked about reverse flushing a few threads ago. Wonder if I could do that with the vinegar or Salt Away. But that would send the crap down into the pump. Might not be a good idea. Have to think about this some more.Is there anyway to force the water up though the system without running the motor?Thanks guys.

 

[larry w]

water flow

Take off the cowl cover and find where the water exits from and follow the exit hose back into the engine. Remove the clip and hose. Contrive up a fitting that will allow you to pour the solution down into the engine. Tape off the intake holes. Allow it to sit overnight.ormake up a bucket of solution. Put the lower end into it and pull the starter rope (with the dead-man key out) about two dozen times. That will pull some stuff into it.

 

[Brian D]

I'll try that...

Thanks, Larry. What ratio V:W do you recommend? Quarts to gallons?

 

[larry w]

Brian,

two quarts of vin in one gallon of warm water (quickens the reaction) should do it.

 

[Fred Ficarra]

Brian, what model Yamaha do you have?

Oop's, a 9.9. is it a 4 stroke?What's that screen for, at the left side of your photo? I've removed the carbs from my Yamaha dozens of times. No cables are connected to them, just cams. They pop right out.Are you trying to open-up the power head? What makes you think your engine needs service? My Yamaha has run mainly in saltwater for the past 18 years. It get flushed every couple of years or so. I checked the block for corrosion back in '05 or so, by removing the thermostat. Nothing. Perfect! How do they do that? (mine's a 25hp)

 

[Brian D]

Thanks Larry...

Fred, it is a four stroke. The screen is part of the carburetor. I have very little or no water stream when I start the motor. So either the pump is shot (and now I don't think that is the case) or the pipes are clogged. I would rather flush than fix. Again, this does not mean I won't ever service, I will. But I'll wait until winter for something to do.

 

[Alan]

Rick is right

Those SS clips flip up and pull the pin out to the left. A screw driver should do the job easily.

 

[capri 22 809]

Thermostat

Check the thermostat is ok if all else fails. My fathers 2002 9.9 Yamaha high thrust had a clogged thermostat. Impeller was ok when checked. Other issue with engine has a electronic choke problem. It doesnt work. Have been told that is a common problem.

 

[Brian D]

Just to close this thread...

Went to the boat today with a half gallon bottle of vinegar. First removed the upper cowling and removed the water outlet hose. BINGO. Found the problem. Clogged outlet. Cleared it, connected the hose, started the motor and I have a nice steady stream of warm (to the touch) water. I let the motor run for a good 15 minuets while I cleaned the bottom, Just wanted to make sure it wouldn't clog again.I went ahead and mixed the water/vinegar solution and ran that through the motor's cooling system. It flowed without any issues and I left the solution in the system. I will flush it out again next weekend.Again, much thanks to everyone here for their support. I feel whole again knowing that my motor is working fine.Fair winds and following seas to all.