1990 Force L-Drive 90hp -- Can't get it to idle -- losing my mind :D

[The Force power]

So she's idling fine but dies going into gear on the water, works fine on muffs... I'm told carburator idle ajustment?

At what RPMs is it idle in Neural?

 

[Nordin]

The idle speed should be 7-800 RPM i water and gear, 1100-1200 RPM at muffs.
If the idle speed is correct but it still stop when put in gear you maybe have the air fuel mixture screws at the carbs set to lean.
Start setting should be 1-1 1/4 turn out from seated and adjust in 1/8 turns each time.
Let the engine run about 10-15 seconds between each adjust. It has to adapt to the new setting.

 

[The Force power]

The idle speed should be 7-800 RPM i water and gear, 1100-1200 RPM at muffs.
If the idle speed is correct but it still stop when put in gear you maybe have the air fuel mixture screws at the carbs set to lean.
Start setting should be 1-1 1/4 turn out from seated and adjust in 1/8 turns each time.
Let the engine run about 10-15 seconds between each adjust. It has to adapt to the new setting.

I guess someone did not follow the information I provided

 

[Solace]

I guess someone did not follow the information I provided

Man. You know. People try, this stuff is complicated. It's hard to even understand how to read the language more experienced boaters share.

I set my idle, she's roaring at 3000 RPM. Idle screw totally backed out, playing with carbs. It turns out my butterfly flaps needed to be adjusted big time -- I think -- so it's one thing to give advise, but it's another to understand it. Thank you for replying, it takes time to process, understand, and apply.

 

[Solace]

FYI I printed your text and have it folded on my boat where I'm working.

Specifically,

8D. Readjust idle speed to 700-750 RPM.

IT WONT GO THAT LOW!!!! Ahaha. Seriously, she just wont. After days trying to figure out why, I believe it to be my butterfly valves are not adjusted.

Will figure it out tomorrow and get back to you.

 

[Nordin]

Pics of the timing tower, roller to the cam at carb, throttle butterflies at idle etc.
Something must be set wrong, how is the timing set?
If throttle butterflies are closed at idle there must be something wrong with the timing advance.
Is the throttle/timing linkage bending?
Pics maybe will give the answer.

 

[jerryjerry05]

Not everything is cut and dried and easy to understand and put into use.
In some cases??? there can be 2-3 things set wrong and the idle won't come down unless they all get set right.
Throttle linkage, air screws, air leaks, timing set wrong, butterfly's, etc. ???

 

[The Force power]

Man. You know. People try, this stuff is complicated. It's hard to even understand how to read the language more experienced boaters share.

I set my idle, she's roaring at 3000 RPM. Idle screw totally backed out, playing with carbs. It turns out my butterfly flaps needed to be adjusted big time -- I think -- so it's one thing to give advise, but it's another to understand it. Thank you for replying, it takes time to process, understand, and apply.

I hear you & will get you through this.
how are you "adjusting" the RPMs ? hopefully at the screw on the bottom of the tower-arm (connected to the trigger-assembly)
also, with the unit OFF and in full throttle forward; are all butterflies evenly horizontal? I mean the throttle butterflies NOT the choke butterflies!

 

[Solace]

So, as it turns out, I readjusted the bar that connects all the carbs throttle butterfly valves. The bottom one was so far out, it screwed up the top two. I grabbed a mirror, made sure they all lined up at WOT, and adjusted everything as you would.

Sprayed some carb start in there and WHOAAAAAAAA she screamed and sounded SUPER THICK. Turned it off right away, neighbors are for sure gonna complain now lol.

Heading to water to play....

Moral of the story, we need to instruct future boaters to 3x check the butterfly link positions.

 

[Solace]

So the carbs feel like they're pulling air more. I can't get the idle down, I'm suspecting timing is still off -- but forgot my timing gun at home! Farts. Will try again later.

 

[Redbarron%%]

View the videos of Link and Sync as a first option.

 

[Solace]

I can't actually find any videos labeled link and sync... where do I find that?

 

[Solace]

Going with this guy, never heard of this term before -- hope it helps

 

[Solace]

Ahhh okay, so yeah things were super duper not close to right. I have everything adjusted now, should work.. heading to water lol

 

[Solace]

Hi all hope yall will still help me. I went back to the timing, and did the link and sync, checked butterflies, everything appears to be good.

My idle is supposed to be 1 turn out from the seat.

But in this configuration she will not start. If I spray starter fluid in it'll only run for a moment and die.

I was able to manipulate the idle adjust, carb link and carb idle jets to make it run.

I have no idea what I'm missing here. I was able to pop it in gear and make it go but she bogged and died.

Any tips are welcome, I'm gonna miss the damn season at this rate haha.

 

[Solace]

I may be confused on the timing as well. This is what I'm trying to do when I set it up for static testing, right?

I pulled all the plugs, grounded the leads, put it into WOT and hit the starter relay as I watched the timing gun. It's pretty darn close to this.

Correct?

 

[Solace]

Re-reading this I think I did the carb idle screw wrong... I want to go 1 turn out, then start backing it in 1/8 turns? I was backing it out, which makes it run when I get like 5 turns out :/

 

[Nordin]

Initial setting:
Timing advance 28 dgr BTDC at WOT at cranking speed.
Air fuel mixture screws at carbs 1-1 1/4 turn out from seated.
Throttle pick up point should be adjusted so the cam roller intersects the throttle cam at the mark at the cam. The roller is eccentric and you adjust it by loosing the lock nut just a 1/4 of a turn and adjust the roller with a screw driver. This must be done with the throttle rod unhooked from the cam.
Set the throttle rod (timing tower- throttle cam) so the throttle butterflies are horisontal at WOT.
Check the position of the throttle butterflies at idle, they should be just a bit open.
You adjust it by the screw with the lock nut at the bottom of the timing tower.

All this adjustments called link & synk you can find in a thread at top of this forum posted by Frank A. There is a link to a youtube video there too, I think.

 

[jerryjerry05]

Thought the butterflies were adjusted so they open at the same time, they can go past level when at wide open???

 

[The Force power]

This is the link Nordin is referring to