1998 115HP 2 stroke - trim guage and speedo

[cbouch]

I need some advice on my 1998 Yamaha 115hp 2 stroke 1st the trim guage does not work. the guage needle always points all the way to the right. How do I trouble shoot this problem. 2nd, the speedometer stopped working the last time out......the guage just starting going lower and lower until it doesn't move at all. any suggestions on either of these problems would be very much appreciated. Thanks

 

[jevery]

Re: 1998 115HP 2 stroke - trim guage and speedo

Here's a starting place. For the tilt/trim, here's a diagram of the parts. #1 Is a ring, (usually plastic), with a lever. The ring goes over the tilt tube and the lever contacts a pin on the sending unit, (#3 in the diagram). As the motor moves up and down the lever moves, or should move, the pin on the sending unit. What often happens is the plastic ring eventually gets brittle and breaks. The part is still in place and looks fine, but the lever no longer moves the pin because the lever is not secure on the tube. Here's a picture that shows the plastic ring on the tube and the top of the sending unit. If the ring is cracked or loose you will be able to move it on the tube. If that's the case then it's just a matter of tightening or replacing the ring, (hopefully with a metal part), and adjusting it for correct reading at the gauge. If the ring is OK and moving the pin on the sending unit, then it probably the sending unit, though can't rule out a bad gauge.

Speedo quitting is usually a clogged pitot tube. Look for a tiny hole on the very leading edge of the lower unit. Debris in the water often clogs the opening. Use a tiny drill bit to probe the hole. Idea is to not push the debris further into the hole, but rather to get a hold of it by spinning the drill bit and pulling it out.
Hope this helps

 

[cbouch]

Re: 1998 115HP 2 stroke - trim guage and speedo

Thank you very much for the advice. I noticed that the diagram shows a 2006 model..is a 1998 the same thing?? Also, looks like replacing either part is a major operation (lever or sending unit) am I correct?? Thanks again, Cliff

 

[jevery]

Re: 1998 115HP 2 stroke - trim guage and speedo

Yes, the same. Here's the 98 diagram. The ring with the lever is a simple 5 minute replacement. Getting it adjusted just right will take a bit more. Replacing the sender shouldn't be a big deal either, if needed. Post back if the ring and lever assembly isn't the problem. You can verify the sender and gauge is good by turning the key on and moving the sender's pin assembly by hand and watching for gauge movement, (NOT moving the motor itself with the tilt/trim switch, but just the pin on the sender). If the gauge does not move when you mover the sender's pin then there are some other tests I can help you with to isolate the problem to the sender or the gauge.

 

[cbouch]

Re: 1998 115HP 2 stroke - trim guage and speedo

Thanks very much. I will be back in Florida in a couple of weeks and will have the chance to check everything out that you advised me on. Will get back to you either way. Thanks, Cliff

 

[cbouch]

Re: 1998 115HP 2 stroke - trim guage and speedo

Well, I finally got to take a look at the motor and found that the leaver on the sending unit is stuck in the upper most position.....that makes sense because the guage also shows the upper position. I tried to push the leaver down but no luck......I sprayed it with anticorrosive and maybe when I get back in 5 months it will work......if not I will put on another. Thanks for your help. Cliff

 

[rowboater]

Re: 1998 115HP 2 stroke - trim guage and speedo

I have a 1997 115 yamaha and have had the exact same issues more than once over the years. Chances are your tim lever is cracked the original ones are plastic but the new replacements are metal.Its a $20.00 part and simple to replace.My speedometer tube inlet which is on the lower unit dead center and about 1/64 diameter constantly gets plugged up just use a very small drill bit and gently hand run it in to see if the hole is clear. Pretty good chance thats the problem if not there is a union (at least on mine) that you disconnect when removing the lower unit you could blow a very little bit of air into the tube to simulate water pressure and go from there to troubleshoot.Good luck I'd be curious to find out what the fix is for your problems.Those motors are very and I have run mine for years with only minimal problems (not trying to jinx myself).

 

[cbouch]

Re: 1998 115HP 2 stroke - trim guage and speedo

Thanks very much for the advice. Relative to the speedo, a little air blown into the water tube at the junction should move the speedo needle - correct?? Too much air could damage the speedo - Correct assumption?? I tried cleaning out the water pick up hole with a pin but no luck. the pin went in OK and there didn't seem to be any obstruction. I guess that you could blow the air backward also and see if air comes out of the hold. Anyway all will have to wait till next October. Thanks for your advice. Cliff

 

[cbouch]

Re: 1998 115HP 2 stroke - trim guage and speedo

Jevery, I finally got the sending unit to move......the gauge does move when I move the arm on the sending unit but only in the full trim to full down positions.....it just jumps from one to the other nothing in between no matter how slowly I move the arm.......you said that there might be a test you know that can possibly isolate the probem between the guage and the sending unit. ?Wonder if you could please share that with me. /Thanks, Cliff

 

[I Am Mello]

Re: 1998 115HP 2 stroke - trim guage and speedo

I am so glad I found this forum, it's great!

I have the same problem with the trim, I just ordered the stainless cam replacement. What is the easiest way to get the gage to read properly? I've looked and there doesn't seem to be a thread on this. From all of my reading here some of you guys can do things blindfolded, upsidedown, underwater, with one hand in 5 minutes that would take people like me all day with all of my 4 hands.

Thanks,
I Am Mello