Before I order a new powerpack..

[tunaticer]

1992 evinrude 60 tlene outboard.
Fuel is good and fresh and right ratio. Automatic mixer disconnected and premix fuel is supplied.
Fires on all 3 cyls perfectly.
Idles and runs fine.
New plugs (correct plugs for that motor)
Timing is spot on.
Idles at about 650rpm.
Very easy to start.
Compression is 95psi on all pots. (less that 2psi variation on two tests)
New thermostat and temp sender unit.
Disconnect sender unit for no changes.

Motor when tromped with rev hard till it hits 3200rpm then drop back within 2 secs to 2950 rpm and not budge from there. Bring the revs up slowly it reaches 2950 and sits there.
Get full activation of carbies with butterflies wide open.

Plugs remain oily but it fires fine, presumably from full fuel and open butterflies and not reaching WOT rev ranges.

Is it the power pack or have i possibly overlooked something?

Is there anything else I should check before ordering a new power pack?

Going to order a new pack tomorrow around noon if nobody speaks up with something else i should check first.

[OPTI]

sounds like the stator to me,im not that familiar with omc electrics ,but if a merc was doing that it would be a stator for sure.
you need to run the engine when its doing that check spark on all cyclinders and voltage to all coils.

[tunaticer]

I run the timing light when it was playing up at full throttle and spark is constant, all three cyls getting spark. Do not know voltages though, that could be the problem i guess.

[OPTI]

if its got spark on all 3 definately not the pack then .the stator has 2 sides,low speed and high speed,2800 rpm is where the stator switches over from low to high,check the stator voltage at cranking and see if its within specs.
and just check the carbies are getting wot

[wirlybird]

Ahh (My guess) my tip is a sticky float pin with an air leak form one of the seals in the carby. If you get a carby kit for it, whats the worst case scenario you get better performance after you replace the power pack or the stator as Opti said. Best case you solve the problem and it only costs you 100 bucks and another job that you wont have to do later on.

Just make sure you get the full carby kit

[Fed]

I haven't ever needed to do this myself tunaticer but I've heard of people giving each carby throat a squirt of premix from an atomizer bottle to see if one reacts indicating a blockage.

Sounded lie a good idea to me but you'd want to hang on tight as I'd expect it to take off.

Doesn't sound electrical to me, more likely a main blocked jet or needle & seat.

[Stuart]

Sounds like a fuel issue to me mate. You cant tune a 2 stroke with out putting it under load and that means on the water. You dont have to drop it right into the drink, just back the trailer down and do it like that.

Stu

[Fed]

Another thought tunaticer, is this motor fitted with that SLOW mode thing, I don't know much about it other than it limits RPM if a fault occurs like temp or oil, I think it's around 3000 rpm?
Don't know why they put these new fangled contraptions on things.
Is the motor new to you or was it previously working fine then this just happened?

[tunaticer]

Another thought tunaticer, is this motor fitted with that SLOW mode thing, I don't know much about it other than it limits RPM if a fault occurs like temp or oil, I think it's around 3000 rpm?
Don't know why they put these new fangled contraptions on things.
Is the motor new to you or was it previously working fine then this just happened?

Been through the slow mode thing and replaced the temp sensor and thermostat which fixed the problem about a yr ago.
Today I dropped the tan lead off the temp sensor to see if it would make a difference.....nil difference. Slow mode makes the engine shudder like hell, this is just bogging down badly, firing on all three cyls but now thinking it might be very weak spark above 2950 rpm. Going to run multimeters over it tomorrow arvo to try and deduce what the condition of the stator is. Going to make a spark tester so I can see the quality of the spark and how far it jumps.

[tunaticer]

With three carbs feeding the motor, what is the chance that they are all gummed up?
The fuel supply is well filtered and water trapped with a new large spin on filter, a water trap clear bowl plus a third glass inline filter under the cowl and all three look spotless for any contamination. This filter system has been on the boat for all of its life and new cartridges fitted two months before this started playing up this time.

[Stuart]

Its not always a filter issue mate. If the donk has been sitting long enough then the crap in the fuel such as oil and other addatives that they put in the crap fuel we have this day and age evaporates leaving those addatives behind. While most oils are pretty good these days residual oil in pre mix fuel such as your is can build up over time if left to long sitting. The fuel evaporates leaving the pre mix oil sitting in the carb. This can clog the main jets big time and when the engine needs the extra fuel at a certain RPM range its now to restricted. It doesnt need to be that bloked but it may pay to drop the bowls of and clean them as well as the main jets. Doesnt really take all that time to do.

Stu

[Spaniard_King]

if its got spark on all 3 definately not the pack then .the stator has 2 sides,low speed and high speed,2800 rpm is where the stator switches over from low to high,check the stator voltage at cranking and see if its within specs.
and just check the carbies are getting wot

It won't be the stator, as stated above take the front carby cover off and squirt some 2 stroke in each cylinder to see if it changes.. just be aware that if its lean and you run it for too long you risk damage. Also it dosnt sound like a SLOW triggered fault.

[tunaticer]

Buying carby gasket kits this morning if in stock and will give them a complete overhaul and clean before I do anything else. Cheapest option first up.
Run the ohm meter over the stator and checks out fine, need to check voltages on Sunday to see how they are delivering. Fabricating a spark gap tester this morning as well, seems nobody stocks these items anymore at Repco, Supercheat or Autobull???

[Stuart]

I was thinking about this today and I thought It could very well be a dried out or worn bottom end crank seal. I had the very same thing happen years ago and while it would get on the plane it soon began to break down at a certain RPM. I would bet a large amount of lettuce that its either your carbs or a seal.

Stu

[tunaticer]

Looking at the breakdown diagram of this motor I see a "pulse limiter" what is it and what function does it do and could it be problematic giving results like I am getting?

[Fed]

Your fuel pump runs on pulses from the crankcase and the pulse limiter is there in case your motor has a backfire, it stops the high pulse from tearing the fuel pump diaphragm.

That won't be the problem if it was blocked the fuel pump wouldn't work.

I'd still be trying the pre-mix spray bottle to test each carby, looking for one with a blocked or partially blocked main jet. Has to be better than pulling 3 carbies apart for no reason.

[tunaticer]

I agree with that Fed, but with the motor nudging its 20th birthday soon I think it is due for a new kit in each carby. Will be spraying some fuel down each throat tomorrow before I test the stator output and coil output. Replacing the new spin-on filter too, possible it may be faulty and collapsed.......Didn't start happening immediately after replacing that filter but maybe 80 hours after replacement......being sealed and non visible there is no way of checking.