weatherman Posted January 3, 2011 Report Share Posted January 3, 2011 I have a 15 hp Evinrude, cira 1985, which started, when running down the lake at high speed (approx 10-15 minutes time), of loosing all power - continuing to run, but only at 1/2 speed. The motor then surges - ie a couple of minutes of no power then a 1/2 minute of high speed power.... I have had the carb cleaned and disposed of all fuels, drained hoses, etc and have started using a fuel additive (Sea Foam), but to no avail. I'm open to suggestions on what to look for in correcting this problem. It has been in a repair shop, but they keep saying it is an ethanol problem. Is there a hose or something between the carb and the cylinder that could be partially blocked? I'm open to suggestions .. comments appreciated. Thank you. Link to comment Share on other sites More sharing options...
grt1 Posted January 3, 2011 Report Share Posted January 3, 2011 let me be the first to weloome you to this site, Ok guys, I have run this motor and believe me, you are taking a ride of a lifetime when it opens up without warning. I know we have some pretty good mechanics on the board so lets give poor old weatherman an idea of what the problem could be. and the motor in question is located in vermilion bay area so itisn't handy to any big city repair depots. Link to comment Share on other sites More sharing options...
Raf Posted January 3, 2011 Report Share Posted January 3, 2011 have you tried an exorcism? Link to comment Share on other sites More sharing options...
sirfish Posted January 3, 2011 Report Share Posted January 3, 2011 Sounds like you have a cracked coil there weatherman.Been there done that. An easy repair. Link to comment Share on other sites More sharing options...
Bernie Posted January 3, 2011 Report Share Posted January 3, 2011 From your description it sounds like a fuel flow issue. Fuel tank, fuel line, fuel pump are suspect if the carb was done. If it takes 15 minutes for this to happen the tank may not be venting. Did you try squeezing the primer bulb when it did this? Link to comment Share on other sites More sharing options...
Old Man Posted January 3, 2011 Report Share Posted January 3, 2011 That's exactly my thoughts. With the amount of time it takes to happen, I would suspect the fuel tank vent. Link to comment Share on other sites More sharing options...
Carp Posted January 3, 2011 Report Share Posted January 3, 2011 Welcome to our OFC Community Weatherman. Not saying this is definitely the issue, but I had a similar problem and it was a lack of fuel. Fuel pick up hose inside the tank had cracked right at the top. I guess sitting for prolonged periods, it had dried up a bit and when I ran the boat, the wave action moved it around until it finally cracked. Motor ran fine on a full tank, but once the tank was only 3/4 full, had a hard time getting the motor to stay running. Pulled the fuel pick up assembly & fuel gauge off the tank (4 screws). Took the old line with me to Canadian Tire. Bought same size fuel line for a few dollars and cut a piece to replace the old one. Put it back together. Problem solved. You can try adding rubber 'O' rings to either end of your fuel hose (tank and motor end) to make a tight seal to eliminate any possibility of an air leak at those points. Fixed an air leak on another outboard motor this way. A repair shop should/would have checked for this, but just in case................................... Good luck ! Link to comment Share on other sites More sharing options...
HTHM Posted January 3, 2011 Report Share Posted January 3, 2011 I would suggest, remove and replace with (known good) tank, and fuel line, in that order. If either one repair the problem, there is your solution. Ethanol fuel does nasty things to old fuel lines. Look them over carefully. And GOOD LUCK! Link to comment Share on other sites More sharing options...
EddieNorth Posted January 3, 2011 Report Share Posted January 3, 2011 Bad hose from the tank to the engine is my guess. Link to comment Share on other sites More sharing options...
pidge Posted January 3, 2011 Report Share Posted January 3, 2011 Weatherman while I dont know what the problem is maybe this website can help you out. It's got every manufacture of boat engine catorigized neatly. I've linked you to the Evinrude section. Its a discussion fourm all on boat motors, good luck heres the link http://www.marineengine.com/boat-forum/forumdisplay.php?26-Johnson-Evinrude-Outboard-Forum Link to comment Share on other sites More sharing options...
Big Cliff Posted January 3, 2011 Report Share Posted January 3, 2011 Fuel issue? Could be but I'm not so sure, the fact that it surges again kind of makes me wonder. If it just died down after a few minutes of running I would think OK engine is drawing more fuel than the fuel system can supply but since it pickes up again .... Could also be an ignition coil breaking down on one cylinder as it heats up. That would explain the drop to 50% power then a sudden surge as it cools and starts to fire that cylinder again. An intermittant problem like that is something a shop might have trouble figuring out. Link to comment Share on other sites More sharing options...
Spiel Posted January 3, 2011 Report Share Posted January 3, 2011 I had what sounds to be the same problem on my 25 Johnson (1985) and the problem was exactly what Cliff describes below. Replaced the bad coil and never had any issues afterwards. Could also be an ignition coil breaking down on one cylinder as it heats up. That would explain the drop to 50% power then a sudden surge as it cools and starts to fire that cylinder again. An intermittant problem like that is something a shop might have trouble figuring out. Link to comment Share on other sites More sharing options...
Billy Bob Posted January 3, 2011 Report Share Posted January 3, 2011 From what I have read, if the miracle drug called Sea Foam didn't fix it it should be discarded to your nearest American friend... Hi Buddy, when can you drop it off... Bob Link to comment Share on other sites More sharing options...
weatherman Posted January 3, 2011 Author Report Share Posted January 3, 2011 let me be the first to weloome you to this site, Ok guys, I have run this motor and believe me, you are taking a ride of a lifetime when it opens up without warning. I know we have some pretty good mechanics on the board so lets give poor old weatherman an idea of what the problem could be. and the motor in question is located in vermilion bay area so itisn't handy to any big city repair depots. Thanks Bill ... thanks guys for the suggestions. I really appreciate your thoughts. wxmn Link to comment Share on other sites More sharing options...
Blue Lk Posted January 3, 2011 Report Share Posted January 3, 2011 I can't help with your outboard problems,but I can say WELCOME from another VB area member. Link to comment Share on other sites More sharing options...
Bernie Posted January 3, 2011 Report Share Posted January 3, 2011 Weatherman, if you could answer the question regarding the primer bulb I may be able to further help. Also, does it run OK when you back off the throttle? The bad coil is a possibility but I still lean towards a fuel issue. Link to comment Share on other sites More sharing options...
ssminnow Posted January 3, 2011 Report Share Posted January 3, 2011 I had the same symptoms and it turned out to be a cracked coils. Usually occurred about 15-30 mins after starting. This was on an old Johnson 6 hp that I was using as a kicker. Link to comment Share on other sites More sharing options...
camillj Posted January 3, 2011 Report Share Posted January 3, 2011 if it only happens AFTER the coil has heated up (10 mins or so) then almost certainly a coil issue... could also just be a faulty plug .. but I am definitely guessing you are dropping from 2 cylinders to one ... and back up to two .... fix it soon (realtively easy to replace a coil) or risk breaking a push rod....nasty fix Link to comment Share on other sites More sharing options...
weatherman Posted February 24, 2011 Author Report Share Posted February 24, 2011 Sounds like you have a cracked coil there weatherman.Been there done that. An easy repair. How does one go about changing the coil? Tx Link to comment Share on other sites More sharing options...
skeeter Posted February 24, 2011 Report Share Posted February 24, 2011 (edited) I have a 9.9 evinrude that does the same thing. if it does it again shut the engine off. pull the spark plugs out to see if there is a piece of carbon in the gap of the plug. mine is always in the top plug. Edited February 24, 2011 by skeeter Link to comment Share on other sites More sharing options...
Eric S Posted February 24, 2011 Report Share Posted February 24, 2011 I have a 15 hp Evinrude, cira 1985, which started, when running down the lake at high speed (approx 10-15 minutes time), of loosing all power - continuing to run, but only at 1/2 speed. The motor then surges - ie a couple of minutes of no power then a 1/2 minute of high speed power.... I have had the carb cleaned and disposed of all fuels, drained hoses, etc and have started using a fuel additive (Sea Foam), but to no avail. I'm open to suggestions on what to look for in correcting this problem. It has been in a repair shop, but they keep saying it is an ethanol problem. Is there a hose or something between the carb and the cylinder that could be partially blocked? I'm open to suggestions .. comments appreciated. Thank you. POWER PAK Losing spark on 1 cyl easy fix Link to comment Share on other sites More sharing options...
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