1992 Evinrude 150hp EXEN will not run correctly

C

Crosbyman

Vice Admiral
Joined
Nov 5, 2006
Messages
5,443
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 :)
 
Last edited:
S

striper chaser

Seaman
Joined
Aug 4, 2002
Messages
58
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
 
S

striper chaser

Seaman
Joined
Aug 4, 2002
Messages
58
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

Lieutenant Junior Grade
Joined
Sep 19, 2022
Messages
1,045
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.
 
S

striper chaser

Seaman
Joined
Aug 4, 2002
Messages
58
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

Supreme Mariner
Joined
Nov 20, 2001
Messages
16,081
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.

Evinrude Fuel Hose Clamps - Evinrude Fuel Systems - Evinrude Outboard Parts - Boat Motor Parts | iBoats

Since 1998, iboats is the most trusted water lifestyle online store for boat parts and accessories, boats for sale, and forums. Enjoy great priced products with fast shipping.
www.iboats.com www.iboats.com
 
S

striper chaser

Seaman
Joined
Aug 4, 2002
Messages
58
S

striper chaser

Seaman
Joined
Aug 4, 2002
Messages
58
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

Commander
Joined
Sep 14, 2008
Messages
2,410
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.
 
S

striper chaser

Seaman
Joined
Aug 4, 2002
Messages
58
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
 
C

Crosbyman

Vice Admiral
Joined
Nov 5, 2006
Messages
5,443
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
 
R

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
37,827
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.
 
R

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
37,827
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

Seaman
Joined
Aug 4, 2002
Messages
58
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
 
You must log in or register to reply here.
Top