Johnson 25EL76E 25HP WOT Problem Again

[lmifl]

I thought I had this fiqured out but after 1 sucessful run the WOT problem has returned. Only goes 1/5 speed on water at WOT again.

Background, new plugs,new fuel lines bulb,fuel connectors.
Cleaned carb, new gaskets,float needle replaced.

New fuel tank and connector.

New info: after running in forward and returning to nuetral lowering throttle to idle position the engine will continue to race ? As if throttle has no bearing on idle speed. If even removed the cover to verify that idle had been turned
down and it was as the engine raced had to pull fuel line to shut it down.

I am at loss with this. No adjustments were made after the good run?

Any suggestions would be appreciated

 

[crxess]

Re: Johnson 25EL76E 25HP WOT Problem Again

Check the plate under the flywheel that advances timing and opens the Carb. Sounds like it is stuck or the linkage came loose.

 

[lmifl]

Re: Johnson 25EL76E 25HP WOT Problem Again

Crxess

Thanks.

The linkage is under the flywheel. The advance plate which attaches to the
carb linkage is visible but nothing else as it's hidden under the flywheel. They are fine. I have feeling that what ever is going on will only be visible after removing the flywheel.
Whenever the WOT problem occurs the motor will race on.


I'm going to start dismantling today.

 

[tashasdaddy]

Re: Johnson 25EL76E 25HP WOT Problem Again

give me some more info, tiller or remote control, rope or electric start? it the timing plate returning to the idle stop screw. if it is running, doubt it is under the flywheel, all there is under there is the charge coil, points and condenser. most likely timing plate sticking. http://shop2.evinrude.com/ext/index.aspx?s1=bf6ad09c53cead335fcfd8a6471c0f7f

 

[quackaddict1]

Re: Johnson 25EL76E 25HP WOT Problem Again

Are your throttle linkages tight and correct? Will the butterfly open all the way at WOT? If so put it in the water start it, and turn the throttle to WOT, then cup off the carb so you are choking it a bit, if it picks up you have a seal leak somewhere.

 

[lmifl]

Re: Johnson 25EL76E 25HP WOT Problem Again

give me some more info, tiller or remote control, rope or electric start? it the timing plate returning to the idle stop screw. if it is running, doubt it is under the flywheel, all there is under there is the charge coil, points and condenser. most likely timing plate sticking. http://shop2.evinrude.com/ext/index.aspx?s1=bf6ad09c53cead335fcfd8a6471c0f7f

Electric start. Remote control. Timing plate(Is that the Cam throttle control
or armature plate ?)
Sorry I meant below the flywheel. It runs starts easy.

 

[lmifl]

Re: Johnson 25EL76E 25HP WOT Problem Again

Are your throttle linkages tight and correct? Will the butterfly open all the way at WOT? If so put it in the water start it, and turn the throttle to WOT, then cup off the carb so you are choking it a bit, if it picks up you have a seal leak somewhere.

Throttle linkage tight . Butterfly ? Valve choke or Valve Throttle
Valve choke yes Valve Throttle would have to take off Silencer cover to view.
http://shop2.evinrude.com/ext/index.aspx?s1=bf6ad09c53cead335fcfd8a6471c0f7f

 

[quackaddict1]

Re: Johnson 25EL76E 25HP WOT Problem Again

The butterfly is the big waffer looking thing in the carb, it controls air intake in the carb. There is a big hole in the front of the carb, you cant miss it. Remove the silencer cover and take a look. With the motor off, push the control to wide open, the butterfly should turn so that the big hole is almost all open.

 

[lmifl]

Re: Johnson 25EL76E 25HP WOT Problem Again

Thanks

Yes it is. Just checking on the name of the part.

 

[tashasdaddy]

Re: Johnson 25EL76E 25HP WOT Problem Again

ok, is the remote cable pulling the throttle all the way back, sometimes they need adjusting. the flat plate under the flywheel that turns and the throttle cam rubs against, it should move freely, and not hang up. this is what adjusts the timing and carb, when throttling up, or down.

 

[lmifl]

Re: Johnson 25EL76E 25HP WOT Problem Again

ok, is the remote cable pulling the throttle all the way back, sometimes they need adjusting. the flat plate under the flywheel that turns and the throttle cam rubs against, it should move freely, and not hang up. this is what adjusts the timing and carb, when throttling up, or down.

Yes it is. I'm running in a barrell now. However yesterday with the cover off in the water throttled it down and it continued to race in nuetral and wouldn't
reduce idle. Flat plate was back to very low idle position. I had to pull the
fuel connection off the engine to get it to stop.

low throttle speed when in gear put into nuetral and raced apx mid range ?

It moves very freely moving the carb linkage to open the throttle.

 

[quackaddict1]

Re: Johnson 25EL76E 25HP WOT Problem Again

The racing when the throttle is reduced make me think a linkage isn't correct, at idle position, the butterfly in the carb should be closed almost 100%, there are holes in them to let the right amount of air through to produce idle. Is this the case?

 

[lmifl]

Re: Johnson 25EL76E 25HP WOT Problem Again

The racing when the throttle is reduced make me think a linkage isn't correct, at idle position, the butterfly in the carb should be closed almost 100%, there are holes in them to let the right amount of air through to produce idle. Is this the case?

Thanks
I put the boat under a cover last night raining heavy here. But I will check this out ,never even thought of this and recheck the butterfly at idle.

 

[lmifl]

Re: Johnson 25EL76E 25HP WOT Problem Again

The racing when the throttle is reduced make me think a linkage isn't correct, at idle position, the butterfly in the carb should be closed almost 100%, there are holes in them to let the right amount of air through to produce idle. Is this the case?

The choke (butterfly) in front of the carb is in the open postion at the idle
setting.
There is one hole in the butterfly.
I tried several times adjusting the linkage no luck.
The only time the butterfly closes is when I fully choke it .

The only linkage that was disconnected when I reomved the carb was
the choke linkage and the cam throttle linkage.

How do you set the choke butterfly to be closed and not use the choke ?

Lost

I ordered a repair manual but it hasn't come in yet.

 

[lmifl]

Re: Johnson 25EL76E 25HP WOT Problem Again

Well after confusing the term butterfly referring to choke valve with
Valve throttle I see at idle setting it is closed. I am attempting to set linkage
on the cam throttle control and align with the two vertical bars on the armature plate to be touching and valve throttle closed.

Let's see. I will be running in a barrel with prop off.