Throttle adjust so it can go WOT

[ttreewalkerr]

My boat has the 2001 50hp Mercury, 4 stroke.
I noticed when engine as off that when handle is pushed to WOT, it is really only rotating the butterfly's on carbs to 3/4 throttle.
And when pushed from Nutrual to drive,, there is gap to the carb "Arm" to give some push to the lever on carb. In other words the gap from drive engaugement to touching carb. is the exact gap that is whats missing for WOT on carbs & handle.

So i figured i'd just simpily turn the sheithing on cable at the motor to take out that gap at drive position,,(cause i gotta push the throttle 1/4 to first get any rpms to motor)..

Well when i went to turn the sheithing it springs back and rotates back to the original spot..... So i used i pliers and wrench on the sheithing,, so i rotated one turn held, tried more then it just spins back. There's no lock nut or nothin. ?

Do i just keep spining, and hope the sheithing takes the rotation ?

 

[ttreewalkerr]

Re: Throttle adjust so it can go WOT

Anyone ?

 

[hkeiner]

Re: Throttle adjust so it can go WOT

I believe that the best thing to do is do a proper link and sync according to the manual. Fiddling with linkages without following the correct link and sync procedure is a lot of guessing (for the inexperienced) and may be asking for trouble if messed up. That is my experience...

 

[Coloradolakeboy]

Re: Throttle adjust so it can go WOT

My boat has the 2001 50hp Mercury, 4 stroke.
So i figured i'd just simpily turn the sheithing on cable at the motor to take out that gap at drive position,,(cause i gotta push the throttle 1/4 to first get any rpms to motor)..

If you have linkage to the carb(s) that's where the adjustment would be made. Not in your cable.

It's detailed in the Merc Service manual. I'd get it before you break something!

 

[Barnacle_Bill]

Re: Throttle adjust so it can go WOT

I believe that the best thing to do is do a proper link and sync according to the manual. Fiddling with linkages without following the correct link and sync procedure is a lot of guessing (for the inexperienced) and may be asking for trouble if messed up. That is my experience...

Definitely!!

 

[ttreewalkerr]

Re: Throttle adjust so it can go WOT

Yes, i can see where the adjustment/gap needs to move to.

When i look at motor linkage there is the lob that rubbs to the cam on the carb linkage,,, when shifted out of neutral to drive there is a clear 5/8 - 3/4" gap fro the lob to hit the cam on the carb throttle arm. That 3/4" gap translates into a 1 hour rotation on my throttle arm, then the rpm moves. That offset translates into, my throttle handle bottoming out at WOT, which in turn my carbs are only at 3/4 throttle.

Basically its a even wash i need moved,,,,, theoretically i could use a 3/4" od. hose clamp and have the screw side of that clamp towards the throttle cam taking up the 3/4" gap at drive engaugement, in turn make WOT be WOT.

If that cable was a normal adjusment cable like a brake cable/cltch cable,etc. w/ rotation being allowed to take up slack,etc... i could do this no problem and it would have no effect on the shift portion,, thats a seperate cable.

I did get a small wrench on the hex that is on that cable,, rotated it 1/2 rotation,,, and it wants to spin back due to the whole shething has to turn,, so i used a pliers in my other hand to hold it, as i regriped for another turn on that cable, not allowing spring turn back... Then again & again,,, it was doing exactly what i need,,, it was taking up that 3/4 gap,,,,, i let go and the thing just wants to spin right back.....

So if i was messing w/ all adjustments,,, how ya suppose to keep the cable from wanting to spring turn back ????
do you know whta i mean by the spring/spin back ? It not a cable like a normal adjustment cable,, looks like it,, but it's not.. If it was it would need a lock nut,, there is none cause the sheithing doesn't spin,, it needs to spin all the way up to the handle.


Technically it seems like i'd have to take off my shift handle, lay it on my driveway 15 feet from motor,, then pull my cable out from under the boat, lay then on driveway, create a fixture to hold handle,, hook up cables,,, then when i rotate the throttle cable, the whole cable would be straight on drivway coming off motor, and it would be allowed to rotate freely... then once i move it 3/4",, put the whole darn thing back in.
Disaster for such a little requirment....,,, im better off makeing somthing to add 3/4" to the lob that touches the carb cam, which pivots the buttterfly linkage.

 

[hkeiner]

Re: Throttle adjust so it can go WOT

There should be no need to jury-rig something up to make the motor work correctly and your figuring out how to adjust the linkages on your own (without the manual for instructions) does not seem likely. The best advice is that you go with a stock setup and use a manual to find out how to set things up correctly. If a part is broken, then replace the broken part.

 

[Rudi2]

Re: Throttle adjust so it can go WOT

Wow! 3 people have suggested getting a manual and doing a proper link and sync -- and you're still talking about fixing it with hose clamps and pliers. It's your engine, do what you want, But I would suggest taking it to a certified marine mechanic. A link and sync will cost you about an hour in labor, around here that's about $80.

 

[ttreewalkerr]

Re: Throttle adjust so it can go WOT

Take it easy boyz, easy ,,,, Just thought this 3/4" slack was easy answer,,..

Like it don't spin. or. ya gotta take the cables out like you describe., or ther's a rotating portion of tghe cable just under the boat where you can't see,, spin it.

No one knows, so i will have to buy the manual,,,,, just can't believe no one has adjusted there slack.

 

[hkeiner]

Re: Throttle adjust so it can go WOT

Just trying to keep you from making a mistake...

The attached link and sync guide is for a 50 merc with SN 0D000750 and above. You didn't provide your SN so this may not apply to your motor but it may still give you an idea as to what is involved in setting up a motor correctly.

 

[ttreewalkerr]

Re: Throttle adjust so it can go WOT

I appreciate the effort of those images,, but that has nothing to do w/ adjusting my throttle cable. i don't need to sync the carb,, the 4 carbs are fine,, all works good.

Just 3/4" gap,,,, my motor is at 800 good rpm when in neutral,, lick in gear,, still 800,, but the cable goes to the plastic cam,, that cam has a lob on it,,, wich is 3/4 " away from the cam which is the carb cam,,, that shift lob needs to push on it.... I have to push my throttle lever at the console allmost 1/2 throttle,, then that 3/4" is taken up,,,,,THEN i go to 801 rpm,,,,,, but at WOT,, which on my throttle at console,, i only have 1/2 more to go,, well im at 4,000 rpm,, and my carb butterfly's are only 3/4 open.......

That 3/4" gap at the start, is the 3/4" i need at WOT to give me my 5,500 rpm...

2001 50hp OT221128 4 stroke
50ELHT

Carbs are all good and sync'd

In simple terms,, this is like haveing a 10 speed front brake,, and the cable has too much slack,, so you pull your front brake 1/2 way, and then it is 5mm from squezing your rim,,, then you squeeze all the way and it just creates friction... So what do you do,, on the brake cable loosen the lock nut, spin the cable,,,which spins 1" down,,, adjust,, then tighten the lock nut,,, DONE... simple.