Slipping Throttle Lever Yamaha F115

[Plankton21]

I've a 10 year old Ribeye "Playtime" 6m with a Yamaha F115 engine. The throttle lever slips back knocking off revs unless you have it set at WOT, so you need to keep you hand on the throttle all the time unless it's glassy flat. Any thoughts how I can stop this happening, there doesn't seem to be an obvious way to add any friction.

[Ribtecer]

What throttle handset are you using?

If a Yam 701 it's a simple fix.

[phantom 19]

Yamaha 703 control box the friction screw protrudes from front face of the box, slotted cheese head screw, tighten to add friction.

Yamaha 704 console mounted lever pry the oval shaped cover off the rear of the control box plastic cover (which house the trim switch) and tighten screw.

[Ribtecer]

^^^ he's right, 703

[Plankton21]

Issue is that that it's not a 700 series but a 6X3 with the throttle lever on the outside of the console and the control box on the inside. It's not easy to get to the control box and you ideally need an extra elbow. I'm just unsure if a friction control exists or where the friction control is.

[phantom 19]

You can see the friction screw housing in the photo. Pop the plastic cover that is visible in that photo in the black moulding directly behind the control lever. That will reveal the friction screw.

Top two screws with locknuts in that photo are the max throttle stop in fwd / reverse adjustment,

[Davie]

Phantom is meaning the small moon shaped plastic bit from 12 pm to 2pm.

[Iron Dials]

FWIW, I had a similar issue on a previous boat, perhaps not as pronounced as your case.

I suspected the cables were damaged internally as throttle could be a little clunky.
Cables were checked both by me, disconnected from the engine, with free movement and
also when engine serviced.
At the beginning of the next season the cable jammed due to internal damage.
New cables solved the problem.

This may not be your root cause but worth exploring.

[boristhebold]

I was just going to say look under that cover on the round plastic trim bit, remember though when you adjust you dont want it to have too much friction as its an added safety element if you exit the boat and the kill cord does not work you would be thankful that the handle would return to very low revs.

[Plankton21]

I'm going to have a fiddle around and see if I can figure it out! It's a real pain having to have your hand on the throttle all the time.

[phantom 19]

Originally Posted by boristhebold

I was just going to say look under that cover on the round plastic trim bit, remember though when you adjust you dont want it to have too much friction as its an added safety element if you exit the boat and the kill cord does not work you would be thankful that the handle would return to very low revs.

It is not a safety feature at all. The throttle should not return to low revs when the handle is released - it should move with minimal friction but stay in the same position when the handle is let go.
The kill cord is your safety feature.

[phantom 19]

Originally Posted by Iron Dials

FWIW, I had a similar issue on a previous boat, perhaps not as pronounced as your case.

I suspected the cables were damaged internally as throttle could be a little clunky.
Cables were checked both by me, disconnected from the engine, with free movement and
also when engine serviced.
At the beginning of the next season the cable jammed due to internal damage.
New cables solved the problem.

This may not be your root cause but worth exploring.

“FWIW, I had a completely different issue on a previous boat, absolutely nothing like as your case.”

“This is definitely not your root cause and worthless exploring”

[Iron Dials]

So anyway, when I replaced the cables the throttle stopped tending towards idle.
As the strands had broken down inside they were catching on the lining and pulling back towards idle.


Of course it could be also be a Poltergeist.







I had stopped using this forum for a while, I see little has changed.

[phantom 19]

It must’ve been a poltergeist as control cables are not stranded, they are single solid 304 stainless steel inner, with a ptfe sleeved radial wire reinforced outer.

[Plankton21]

When I pop the Cresent shape cover on the throttle al that I'm greeted with is GRP. Should I drill through to access the friction screws ?