40 HP Evinrude max rev. 1500

Hi

I got problem with a -89 40 HP Evinrude (TE40ELCEC) wich came with the boat i buyed this winter.

With no gear in the response is good (disconnected the gear shift wire to test) it sond and feel very responsive. As soon as i put a gear in and give thrust the engine never revs above 1500 (on tach instrument).

I did disable the VRO system by plugging the oil hose to the pump (Did not diconnect the three wire connector as i read about it just now and dident know when i was at sea) and disconnected the tvo wires from VRO tank.

I did 5-6 short (900 meters) test runs, at two of them the temp warning started to sound.

The water coming from the engine seems very cool, maby to cool so i think that maby the thermostat is broken but that still wouldent explain the problem. I even ran it in an oil drum for abot 10-15 minutes without feeling the exhaust cooling water getting any warmer.

Another thing is that it's fitted with Champion L78YC sparkplugs. I see in OMC part database that it suppose to be QL78C. Checked it on Champin site it seems like the missing Q is the marker for "RESISTOR-CDI" and the extra Y is for "STANDARD PROJECTED CORE NOSE". Can this be a part of my problem ?

The revs is so steady at 1500 that i suspect it's somekind of regulator kicking in and i did read about the S.L.O.W feature. Is it possible that iv got that on this engine and if so what can i do to check it.

Any help would be super as i put a LOT of effort into this boat and now when the summer finaly is here the engine fail on me.

Re: 40 HP Evinrude max rev. 1500

If you have an alarm going off stop running it until you find out why. What does the alarm do? Is it a series of beeps or a long beep or what? If you are not getting over 1500 rpms and it runs steady it is probably going into what they call slow mode to protect the engine. Let us know what the alarm sounds like.
If you disconnected the vro are you mixing your fuel at 50:1? If not you might be burning it up. If it is overheating due to a stuck thermostat that is pretty easy to take care of. You may have a blockage somewhere or a bad water pump. Post the alarm sounds and we will go from there.

Re: 40 HP Evinrude max rev. 1500

First of all thanks for helping me out here.

I did mix the fuel manually with 3% oil.

The warning horn made a constant sound (on two of the test runs not the others) wich indicate a hot engine. I did place the hand on top cylinder and it was hot but i dont know if it was to hot. I could keep the hand on for about 3-4 second befor it got to hot.

Still confused why it does keep me on 1500 RPM when i just started the engine. With no alarm sound i thought it wouldent s.l.o.w.

Thanks again for caring, it means a lot

Re: 40 HP Evinrude max rev. 1500

I will check the carbs tonite. Got a tip that highspeed jets might be clogged.

Also ill do a comp. test this week.

As the engine runns fine without load (no gear) it makes me wonder if the s.l.o.w actually is involved. I recon it keeps rpm low by affecting ignition and in that case i should have low RPM without gear too i recon.

Still anyt tip would be aprettiated.

Re: 40 HP Evinrude max rev. 1500

Well i recon i found the problem now.

Floater chamber on the lowest carburator was compleatly dry and full of dust. It turned out that the floater nozzle was stuck in closed position due to a very small metal piece that had rusted and stuck in the nozzle.

The tricky thing with the problem was that the engine actually DID work on both cylinders. My guess is that the hose between the two carburators that is connected at top of them, is for some kind of fuel mixture balancing between them. Or maby a to make sure both cylinders get lublicaton if one carburator fails.

My guess is that the lower carburator did get a small amount of fuel that way and when the motor got loaded it offcourse was not enough to keep the engine powerfull.

Any other theories ???

Also i will change gear oil,fuel filter and plugs as i don't trust the guy i bougt it from at all now. That carburator has not been loaded with gas in years in my opinion.

What do you experts think. This must have been the problem ???

Anyway i cant wait to give it a try this weekend.