VRO delete fuel mix ratio?

[roonie]

1986 johnson 90hp
120 psi x4
I have deleted the vro.
It was running and starting better than ever since vro delete...But...
Shortly after delete its struggling to get up and go (hesitates badly)but eventually does clear and go once the speed increases...and when it does get up,seems to run fine 40mph,16ft fiber tech.
Next time I try, it struggles and continues to struggle...very intermittent problem.she shakes when at idle when this above problem is present. I've cleaned both carbs.
im a pretty good vehicle mechanic....dad was a circle track racer.played with engines all my life...just not boats.
One issue I did find is the black/yellow stripe ground wire inside the shifter has been removed and capped.
The buzzer alarm looks to be melted.
My question is....should this black/yellow stripe wire inside the shifter be re-grounded?
What should I be mixing my (now)non VRO fuel ratio?Thanks in advance!

 

[jimmbo]

50:1

 

[saltchuckmatt]

That outboard was designed to work with a VRO hooked up.

Somewhat doesn't surprise me that it's not running very well at low RPMs because that's what the vro does is lean back the oil.

Your other issues are definitely issues that you need to remedy. Never run an outboard in a lean situation so I'm not sure if it's overheat or you didn't properly unhook your vro alarm system.

I believe you're on the right track so keep diagnosing and keep working on it and I hope it works out for you.

 

[racerone]

If motor is in good condition it will idle all day long with 50:1 mix.

 

[cyclops222]

A overheated motor cooling system can get a very rough idle and running range. A Harbor Freight Temperature Gun with the red dot reading point would help you find hot places in degrees F.

 

[racerone]

Grounding a black / yellow stripe might stop the motor.----Best to find a wiring diagram and check all wiring.

 

[roonie]

A overheated motor cooling system can get a very rough idle and running range. A Harbor Freight Temperature Gun with the red dot reading point would help you find hot places in degrees F.

Thanks...no Harbour freight where I live but I get your drift.

i just found out I have one new plug (ngk BR9hs10) not tan like the other 3.they were out of champions QL77JC4 so he gave me ngk

 

[roonie]

racerone....that black/yellow wire i mention has been disconnected for years.
i bought the boat that way.when i purchased the boat ,not running, maybe 15 yrs ago the wiring was a bit messed up....i did find a diagram back then....thats what got the boat running yrs ago.
I do recall the black/yellow was to go to ground....I don't recall why I left it ungrounded

 

[racerone]

The black / yellow is part of the kill circuit.-----One clean plug might mean no spark.-----No fuel.----Too much fuel.-----No crankcase compression.

 

[roonie]

I must apologize...my bad.
I was trying to go by memory.
It's not the ground wire...it's one of the 2 black/yellow wires coming from the ignition.one of the 2 black/yellow stripe wires has been capped off

 

[roonie]

The black / yellow is part of the kill circuit.-----One clean plug might mean no spark.-----No fuel.----Too much fuel.-----No crankcase compression.

You see the far right plug is white while the others are tan.
That white plug comes from a hole that is 10# under 120psi...maybe less than 10# (lbs) only

 

[roonie]

Well, I think I found the issue on the cylinder....I pulled the brown wire leading to the coil...a bunch of dust/corrosion fell out.that'll probably fix it

 

[cyclops222]

Those plugs say the engine is in deep trouble and need to be changed with correct plug gap. What brand of oil are you using ? Is it rated for water-cooled engines ? 50 to 1 is a safe ratio with modern oils.

 

[cyclops222]

Plug wires might need replacement ? Those carbs are over due for a correct amount of Sea Foam into the next tank full.
Find a accurate place that states the correct sparkplug # for the engine. Or call NGK for the correct number to use.

 

[Chris1956]

Hesitation to accelerate could be due to a bad fuel pump diaphragm. If the diaphragm leaks, raw fuel can foul a spark plug.

If/when the boat gets on plane, the leak can be too small to affect high speed operation.

 

[cyclops222]

My fouled sparkplugs ALWAYS gave notice starting at idle in gear. Then progressively more stumbling at more higher speeds. eventually a complete loss above of more than 3/4 throttle. I carried 2 brand new sets of NGK plugs.
Racerone I owe you a set of compression readings on the old virgin.
So glad I do not have any 4 stroke O B engines. I would be fiddling with valve lash all the time.