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1985 90hp Yamaha on my Montauk - Help!
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| dmrose |
Posted on 07/04/10 - 4:26 PM
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1985 3 cylinder 90 hp Yamaha, 8 hp Honda BP8 1990.
She's been running like a champ. Yesterday while on plane and cruising at 4300 RPM the big motor stalled suddenly and came to a complete stop. Upon trying to get it going again I checked the primer bulb, it seemed firm. No overheat alarm, the plug wires were securely attached, plenty of fuel, etc. I ended up getting home on the kicker which runs with gas out of the same tank (28 gallon Tempo). I leave it at the Marina overnight.
When I went to get the boat this morning, the kicker fired right up and idled for 2 minutes then died and I couldn't get it restarted, so I roped it around the dock system to the sling and got it home. When I put it on the muffs, the 90 hp started right up with extra throttle (1500 RPM). It ran great as long as I was giving it gas, but then would not idle.
I went to start up the kicker and it fired right away ran for 2 minutes and then died, wouldn't restart. It has been acting very erratic for a while though and I can't figure out if they are related or not. I immediately think water in the gas. I siphon fuel from the bottom of the tank into a glass jar and no water. I check the fuel filter bowl on the big motor and no water. So then I think fuel flow problem.
Both engines are fed with one big tank and there is a valve I use to select which motor. I think maybe something is wrong with the valve so I drop the fuel line leading from the primer bulb directly into the tank and same thing, run's fine with extra gas, won't idle. Can anyone help, I'm losing my mind! Thanks!
D
Edited by Tom W Clark on 07/05/10 - 8:05 AM |
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| Phil T |
Posted on 07/04/10 - 5:02 PM
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Sounds like you forgot to open the vent on the gas cap.
1992 Outrage 17 I
2019 E-TEC 90, Viper 17 2+
2018 Load Rite Elite 18280096VT |
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| dmrose |
Posted on 07/04/10 - 5:12 PM
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I iwish.
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| joninnj |
Posted on 07/04/10 - 5:23 PM
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Contaminated Fuel? do you have a water separator? if so are you using a 10 micron filter to help with ethanol?
Try draining the carbs. The 90 yamie has brass nut om the bottom of each carb on the left as you look at the carbs. You do not need to completely remove them just let them drain. You do not want to drop them in the lower cowl...
good luck
Jon in NJ
Many other boats and outboards in my boating history
The Whaler is the one I like the best!!! |
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| Joe Kriz |
Posted on 07/04/10 - 5:27 PM
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Sounds like you have a fuel delivery problem if both engines are doing it.
If only one engine was doing it from the same tank, then I would say something is wrong with one engine. But it doesn't appear that way.
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| Fishmore |
Posted on 07/04/10 - 8:40 PM
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It does sound like fuel so I would look for sediment in the fuel tank, if necessary flush the tank, fill with fresh fuel and replace the fuel filters all very easy. Next, if I still had a problem I would pull off and the clean the carbs. One other possibility is that your 20 -25 year old fuel hose is degraded and falling apart either by age or by ethanol so it might be wise to replace that also.
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| Phil T |
Posted on 07/05/10 - 7:25 AM
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Disconnecting from the existing tank and running of a different one is one step. The next item to eliminate is the fuel line and primer bulb.
1992 Outrage 17 I
2019 E-TEC 90, Viper 17 2+
2018 Load Rite Elite 18280096VT |
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| dmrose |
Posted on 07/05/10 - 9:26 AM
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Okay, thanks all for the input. My tank and fuel lines including primer bulbs are new within the last 6 months.
I'm going to try replacing the fuel and then think carbs. I'll keep you updated! Thanks.
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| CES |
Posted on 07/05/10 - 9:36 AM
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Also, run some Sea Foam through your carbs after you put new fuel in your tanks. Sea Foam works great at cleaning out the carbs.
Cliff
1966 13' Sport with a 1993 40hp Yamaha 2 Smoker |
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| WhalerCaptain |
Posted on 07/05/10 - 10:11 AM
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Stail fuel maybe?
Sounds related
Good luck
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| dmrose |
Posted on 07/12/10 - 2:26 PM
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Not fuel... Took it to a mechanic... Scored cylinder and zero compression... Ouch. My first boat, first Whaler, first engine melt down.
I had trouble with it since the first day I got it with near constant over heating. One thing after another now she's dead in the water. There is a 1995 Yamaha 90hp on Craigslist for $2600. Supposedly in good shape. At this point I'd like to re-power it and sell it. Not sure what I should do. Do people buy these motors after they go TU? Thanks in advance.
Any suggestions?
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| Joe Kriz |
Posted on 07/12/10 - 2:34 PM
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Both engines have zero compression?
If only one engine, why doesn't the other one run properly?
If you sell, are you going to buy another boat?
If so, you might be buying someone else's problems again.
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| dmrose |
Posted on 07/12/10 - 2:42 PM
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No, the little motor is fine, it was a fuel flow issue as we suspected.
I really don't want to sell it but after the re-power investment, the finances may force me to. Not cool.
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| Joe Kriz |
Posted on 07/12/10 - 2:48 PM
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That's good to know about the smaller motor.
I understand that money is tight these days.
If you had a mechanic check out that other engine for $2,600 dollars, that might not be a bad way to go... Hopefully a freshwater engine.
Or keep looking for a good used freshwater engine.
Sometimes dealers get good trade-ins.... and then they might give a short warranty.
Good Luck
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| dmrose |
Posted on 07/12/10 - 2:56 PM
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Thanks Joe, I appreciate your advice.
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| DWinter |
Posted on 07/12/10 - 3:46 PM
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I blew a hole in the #3 cylinder of the 85hp commercial version of the same motor so I know your pain. The the 90 has oil injection but mine was premix. Actually I overheated it one day and warped the head a little allowing a small amount of water in the cylinder. A new head gasket didn't fix it and I ran it for another year before I blew it. That motor saw a ton of fish though. I used to run it 20 miles offshore VA Beach or 30 miles one way up the Ches Bay without a second thought.
Duane G Winter
1984 BW Sport 15 Center Console |
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| Phil T |
Posted on 07/12/10 - 4:04 PM
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Sorry to hear the news.
I was under the impression the motor was running like a champ (post 1).
If you had mentioned the overheating, I would have skipped the advice on fuel and pointed you toward a mech
1992 Outrage 17 I
2019 E-TEC 90, Viper 17 2+
2018 Load Rite Elite 18280096VT |
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| Gamalot |
Posted on 07/12/10 - 4:46 PM
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Not to make a joke of this but don't they all seem to run like a champ just before they crap out?
I don't know how expensive a rebuild of the top end might be but it is one option to look in to depending upon the condition of the rest of the motor. If you do scrap the blown motor then keep in mind the lower unit has some good value to those searching and could off set the costs a bit. You can be sure the shop that ends up with it will be looking to get it free and to sell the lower end for close to $500 and the PT&T if it has it for another good chunk. Part out what is still good.
Gary
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| John Fyke |
Posted on 07/12/10 - 5:34 PM
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Re-building the head on a 1985 motor seems useless to me. Sorry about your troubles dmrose. My brother had issues with his 1994 Johnson 115. Spent 3 thousand on it last summer and it started acting up again. He chose to re-power.
John Fyke
Re-Fit or Reef It
1979 15' Sport with Super Sport conversion and 70hp mercury. |
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| Gamalot |
Posted on 07/12/10 - 5:48 PM
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Good point JF and you can't do it at $100+/hr in a shop but a DIY top end rebuild is doable for some of us with friends and some mechanical abilities. At $3,000 I too would go for a brand new one and pay the bills. Buying a used other guys headache is not my idea of good finances unless the other guy is rich and just plain dumb.
My motor is an '84 EV 90 and if it does not run for pretty cheap then my next one will be a 2010-2011 and I'll be asking for forgiveness because it is easier then getting permission.
Gary
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