1992 Evinrude 150hp EXEN will not run correctly

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Crosbyman

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backtrack a bit.... how did all this start suddenly ? any chance fuel is inadequate (contaminated) for some reason ?

any chance the VRO is not working properly, is it getting good pulses from the crankcase to work under load at higher RPMS .

smokes a lot ...oilsmoke ( bad mixing) or water ..vapour ?

vro filter ok ? see service tips....

continuousWave: Whaler: Reference: VRO Fuel-Oil Mixing

OMC VRO fuel-oil mixing in outboard motors
continuouswave.com
I know nothing about big engines... but had to ask :)
 
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striper chaser

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striper chaser said:
I had no idea there was jet in the bowl, now I do.... Time for a test run...
Click to expand...
well that didn't go as well as I thought it would, ran like crap, couldn't get out of the gate without it dying, snorting and sneezing, barely got it back on the trailer, back to they drawing board... UG
 
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striper chaser

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Crosbyman said:
backtrack a bit.... how did all this start suddenly ? any chance fuel is inadequate (contaminated) for some reason ?

any chance the VRO is not working properly, is it getting good pulses from the crankcase to work under load at higher RPMS .

smokes a lot ...oilsmoke ( bad mixing) or water ..vapour ?

vro filter ok ? see service tips....

continuousWave: Whaler: Reference: VRO Fuel-Oil Mixing

OMC VRO fuel-oil mixing in outboard motors
continuouswave.com
I know nothing about big engines... but had to ask :)
Click to expand...
it all started with it not wanting to start but ran pretty good once it started up. Found out the plug gap was at 0.45 - 0.40 not the 0.30 so I fixed that problem. Then I noticed the carbs leaking because the old bowls were warped so I bought 6 new ones and replaced them but had no idea about the high speed jet in the bottom of the bowl (thanks racerone) so I fixed that. The new bowls did come with new jets but the diameter of the hole is less than half of the originals, I thought they were a replacement for the jets on the side of the carb.
The fuel line that comes off the bottom of the VRO is leaking around the flange, I replaced the fuel line and cranked it tight with a SS hose clamp, still leaks, I wonder if it may be sucking air.
I replaced the fuel filter to the vapor separator.
As far as the fuel goes I have new fuel in it and pre mixed 50:1.
I'm sure the smoking was because there was no high speed jet so it was getting a bit too much fuel.
How to check the pulse limiter??
I do have a Master tech conversion pump on the way to replace the old VRO that is leaking.
This motor is 30 years old, not in bad shape and has plenty of life in it. I'm sure a lot of the stuff I have replaced was needed or will be needed down the road.
Just be nice to go fishing at least once before the season is over...
 
stresspoint

stresspoint

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striper chaser said:
Just got back from running the motor. The video "Motor 3" is what happens when I begin give it throttle, it just bogs right down like it's being starved. The other two are at idle at the dock. During this test I had the neutral switch disconnected as well as the two temp sensor switches, this changed absolutely nothing, sure does smoke though... I checked the cylinder temps after it ran for a bout 15 minutes, the port side stayed around 100, the strbd stayed around 115 so temp is not an issue... I hope this helps...
Click to expand...
shot in the dark .
from memory these motors when the oil pump fails they give a full dose of oil to the motor rather tan 0 oil .
you will not get an oil alarm ..
flooding the motor with oil will cause it to bog down and smoke as you describe.

if this is the cause , you may want to replace the plugs as they can be damaged from burning the excess oil.
 
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striper chaser

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stresspoint said:
shot in the dark .
from memory these motors when the oil pump fails they give a full dose of oil to the motor rather tan 0 oil .
you will not get an oil alarm ..
flooding the motor with oil will cause it to bog down and smoke as you describe.

if this is the cause , you may want to replace the plugs as they can be damaged from burning the excess oil.
Click to expand...
the VRO was taken out so I premix 50:1 so no chance of fouling or burning up a cylinder due to no oil... the plugs are burning as they should.
 
dingbat

dingbat

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striper chaser said:
The fuel line that comes off the bottom of the VRO is leaking around the flange, I replaced the fuel line and cranked it tight with a SS hose clamp, still leaks, I wonder if it may be sucking air.
Click to expand...
Worm screw hose clamps have no place in a fuel system.

Use the OEM specified clamps or equivalent.

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striper chaser

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striper chaser

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Back in the game, kinda... took the boat out yesterday afternoon after installing the high speed jets, Thank You Racerone, put the boat in, fired up, ran smooth, backed out of the 50 yard long chute, put it in forward and started going towards a 5million +$ yacht with no steering, the steering cable snapped @(&^%$) so I had to muckle onto motor to turn it enough to get it on the trailer what a comedy show.... So, today I put on a new cable, ready to go...
Put it in, fired right up, back out of the chute and away I went. Engine ran perfect at 4000 rpm, I felt good with what I had down. I throttled down to spy a fishing spot then decided to go elsewhere, all of a sudden it would not go over 2000 rpm I suspect limp mode. The temp gauge was at 120 I used the IR temp gauge and it said 125 all over. I un plugged the 2 temp sensors, no change. I dare not shut it down so I again limped back to the dock, ARRR.. did I get a lemon, what else am I missing???
 
dwco5051

dwco5051

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Had an almost identical thing happen on my 150 some years ago. In my case the little roller on the throttle cam folower had fell off. The roller and C clip were laying in the lower housing and a 10 minute fix.
 
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striper chaser

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dwco5051 said:
Had an almost identical thing happen on my 150 some years ago. In my case the little roller on the throttle cam folower had fell off. The roller and C clip were laying in the lower housing and a 10 minute fix.
Click to expand...
thats not it, unfortunately... I think it's in some sort of slow mode
 
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Crosbyman

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slow mode aka SAFE mode on ETECs ...did that exist in 1992 ???

if so.... what triggers SLOW mode...best to find out as it will point the way to happiness
 
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racerone

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Yes , the S.L.O.W. existed in 1992.----Triggered by overheat.------Need to learn how to use a timing light to pinpoint the loss of spark I think.-----Check that shift switch again.----I suspect spark was lost on 3 cylinders.
 
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racerone

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Is 4000 RPM all you can get out of this motor ?-----It should run to 5500 RPM.------Did you get 5500 RPM last season ?
 
S

striper chaser

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racerone said:
Is 4000 RPM all you can get out of this motor ?-----It should run to 5500 RPM.------Did you get 5500 RPM last season ?
Click to expand...
I could get up to 5000 but did not feel the need as the tide was low and didn't want to hit an oyster bed at that speed if you know what I mean..
It would scream when I first got it a few months back
 
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