High speed stall

[miket]

Johnson 1997 115hp
Was running great until i overheated.
Replaced head gasket, ran well until battery drain.

No tack or charging, replaced regulator and rewrapped wires
found toasted.
Tack works but volts at 10.9 -11.4.

Will idle and troll, but when up on plan will only
last 1 minute or so before drops down to idle
speed and then picks up on it own again. Will plain
longer if trolling a while.

Changed fuel filter, no change in problem.

Is this electrical or fuel?

thanks Mike

 

[Molaker]

Re: High speed stall

Don't know about your stalling problem, but it sure sounds like you have a bad rectifier.

 

[miket]

Re: High speed stall

Molaker,
I have regulator/rectifyer which I replaced and got
my tach back. The stator looked good. Could I have
changed the position of an ignition part when I had
fly wheel off?
mIke

 

[Molaker]

Re: High speed stall

Sorry, I didn't note the model year. But, it still sounds like a regulator/rectifier prolem - or a stator problem. I doubt if you changed a part position. The tach is triggered by pulses from one lead of the stator. It probably doesn't take as much voltage to trigger the tach as it does to produce 12v charging current. You probably ought to test your stator - at least a resistance check. Apparently you had quite a bit of current draw (toasted wires). That much current could very easily have caused some shorted turns on your stator. I don't have specs for that stator, but if it is the problem I would expect the reading to be low.

 

[jtexas]

Re: High speed stall

just to be sure any measurement errors get ruled out.....your voltage measurements, is that on a dash-mounted gauge, or at the battery terminals with a multimeter?

also, you've probably checked this already but I'll just throw it out there anyway - inspect the wiring for corrosion & chafed/burned/missing insulation, and the terminal strip on the powerhead (if so equipped) - wouldn't want to replace good parts on account of a loose connection.

still have doubts about the rectifier, joe reeves has posted troubleshooting procedures in the engine faq section of the forum.

 

[miket]

Re: High speed stall

Thanks guys for your reponses.

Still have stall. Reinstalled flywheel key
but no resolution.

I have notices the volts run around 10.9-11.5 while
operating while the tach works.

I will retest regulator and stator.

Could it me high speed jet clogging?

Mike

 

[miket]

no spark on Reeves spark tester

no spark on Reeves spark tester

I built the spark tester with 7/16 gap.
Only getting intermitent spark on 1 cylnder.

Should I have spark plugs removed?

Does this mean power pack failure

 

[skimmer]

Re: High speed stall

Does it sound like its dropping a piston after running for about a minute, If so I would say it could well be powerpack failure or it could just be dropping a piston, The obvious thing after overheating is it's shorting out but you've wrapped all your wires, I'd still recheck powerpack wires, and check voltage from powerpack

 

[miket]

Weak spark Re: High speed stall

Weak spark Re: High speed stall

Using the Reeves spark tester
I found I have weak spark, The tester will
only spark if set at 4/16 instead of 7/16.
I also found #1 intemittent spark which indicates
bad ignition coi?
What does weak spark mean?
Mike

 

[skimmer]

Re: High speed stall

Sounds like you're already on the right track, Weak spark usually means their is a problem in the magneto, Check your coil with an OHM, should read 1.5 -1.9 I think don't know specs for that motor, how long since you replaced the points, should do em every 100hrs, Have you done a compression test first before you have to pull your flywheel again.

 

[miket]

Re: High speed stall

Replaced power pack, two ignition coils and
and wires, still same problem just a bit better.
I can sometimes get the boat up to plane at 3k rpm
for a while and then dies.

Tested stator and getting of .8-.9 ohms where
manual calls for 1.3+.1

Will the stator cause this problem?
Mike

 

[miket]

Flummoxed Re: High speed stall

Flummoxed Re: High speed stall

Not wanting to replace stator ($300) I took off carbeurators.
Taking off air silencer I found significant amount clean purple oil, color of my
two cyle oil, at bottom of silencer. Any ideas where this oil comes from?
Carb's looked real clean all jets are clean, will reassemble.
I guess the stator needs to be replaced.
Any ideas are appreciated.
Mike

 

[lmddmc]

Re: Flummoxed Re: High speed stall

Re: Flummoxed Re: High speed stall

Take it out again and when its starts to stall have someone pull the choke on slowly if its gets better its a Fuel problem, fuel tank vent plugged sucking air
somewhere, or carbs need jets cleaned. Always start with basics ,narrow it down to fuel or electrical Mark

 

[evinrudexp]

Re: High speed stall

Hi, im having the same problem on my 88 150 evinrude xp. I have rebuilt the carbs, have good compression, good spark but still same problem. Did you fix your problem?

 

[miket]

Update Re: High speed stall

Update Re: High speed stall

Swapped in used stator, old stator Ohms reading to low.
Retimed using Joe Reeves method at 4 degrees below
recommended setting.

Great spark with homemade spark tester.

Engine is hard starting, must advance throttle quite a bit
to get started

Engine still stalled after planing but would evenutally allow me
on occasion to run fast quite a bit longer.

I will try and time engine at WOT while on the water
tonight.

Must be some type of wire shorting out.
I check all not wrapped. should I open all wiring wraps
and check.

Any ideas?

Mike

 

[dimock44]

Re: Update Re: High speed stall

Re: Update Re: High speed stall

Swapped in used stator, old stator Ohms reading to low.
Retimed using Joe Reeves method at 4 degrees below
recommended setting.

Great spark with homemade spark tester.

Engine is hard starting, must advance throttle quite a bit
to get started

Engine still stalled after planing but would evenutally allow me
on occasion to run fast quite a bit longer.

I will try and time engine at WOT while on the water
tonight.

Must be some type of wire shorting out.
I check all not wrapped. should I open all wiring wraps
and check.

Any ideas?

Mike

This sounds like a problem I had. I used a spare 6 gallon tank to check if my tank was contanimated and found it was. I first suspeced water, but when I pulled the tank out to clean it I found black rubber in the tank. I suspect it came from the rubber hose coupling between the deck filler opening and tank. I removed it during the tank removal and when I checked it flakey stuff came off on my fingers. The boat is a 91 and a new hose at napa was 6 bucks. I think the rubber would clog the screen in the pick up tube and after the motor shut down would release the obstruction and run ok for a little bit. It must have been from putting the gas pump nozzle down the neck for 16 years. Any way if you have a spare tank or can borrow one It,s a quick ( and cheap ) check Good luck and keep us posted

 

[miket]

Update: High speed stall

Update: High speed stall

I retimed the engine at the ramp and the engine runs well,
except for the stall. The stall does not happen as often.
I will check fuel pressure and obstructions.
Thanks Mike

 

[miket]

Re: High speed stall

Boat now runs well no stall.
I retimed at ramp and opened fuel
pump for a look. I didn't see any obstructions
but did note I could not use the o-ring because
it had become oversized. Perhaps the O-ring was
blocking the intake hope in the pump.
Thanks for the hep.
Mike