1996 evinrude 112 spl stalling when throttling

[tkdunn]

I bought a used pontoon with this motor. Pre-mix gas 50:1. I don't know the history. When I got the boat we ran a can of sea foam. The problem started later that night, don't know if it was related to the sea foam. Next we changed the plugs, everything was greased, and the gear oil was changed. There was oil on the plugs. Ran the boat maybe 5 miles and it seemed fine. There was some oil on the plugs but nothing excessive.

Today I filled the boat up with gas. It fired up right away at the dock. We ran it at around 4500 rpms for 30 minutes or so. Stopped to fish a few minutes and when starting to accelerate, it stalled. It then became difficult to start. The primer ball was firm. It would turn over but not fire. It eventually started but would stall when throttling up. After running at very low rpms for maybe 5-10 minutes I could slowly throttle up, the engine would hesitate slightly. Once I was able to throttle up without stalling, it would run okay until I switched off the boat. This is occurring more and more often.

The last time we took it out I noticed oil coming out of the casing on the motor, below where it says 112 (sorry, I don't know what this is called). We opened the case and there is an obvious leak from somewhere, there is an oily substance inside the case. A friend said he believes the oil is coming from the carb or from a plastic case that the carb is connected to.

Does anyone have a clue what's going on? I've invested a lot of money in this boat and am becoming frustrated. Thanks.

 

[tkdunn]

Re: 1996 evinrude 112 spl stalling when throttling

Anyone?

 

[jtexas]

Re: 1996 evinrude 112 spl stalling when throttling

There's a hose at the bottom of the airbox to scavenge the oil that collects on the airbox cover, and return it to the engine. Some say it's there to keep oil from polluting the water, others say it's needed by the lower crank bearing. Either way, it won't affect the operation of the motor.

Seafoam is great stuff, I add it to every tank, keeps the carbs clean and the cylinders from coking up, but it's not strong enough to clean a dirty carb. A carburetor has to be disassembled for a proper cleaning.

But don't jump to conclusions. Do some basic troubleshooting, starting with a compression test and spark test. For the spark test, use an inline tester (couple bucks at auto zone), with the gap set at 7/16". Report your results.

Inspect the tank for water/debris. Make sure the fuel is fresh 87 octane gasoline, mixed with TCW3 oil in a 50:1 ratio. If the gas is old, drain the tank and replace it. If you add an additive to bad gas, you just end up with more bad gas.

You absolutely can maintain this motor yourself, but seriously, you'll need a service manual. I highly recommend the factory shop manual, it'll pay for itself over and over and over again.

Don't worry, you'll have it running like a top in no time. Meanwhile, stop running it -- any cylinder starved for fuel is also not getting any lubrication.

 

[Oldyellow71]

Re: 1996 evinrude 112 spl stalling when throttling

Just as texas said above, sefoam is great stuff! I swear by it and put in everything I own boats, truck, motorcycle! If you dont know the boat/motors history the first thing I would do is rebuild the carbs. If you own a two stroke and aren't getting fuel, then you aren't getting oil!!! It is a 60 dollar investment that can save a motor. If the tank you bought it with had old gas or looks faded, I would just spend 30 bucks and get a new one. That wat you know the vent is working and you don't have crap gas/water in there. I spent weeks once troubleshooting a perfectly good motor, just to find out my 30 dollar tank had a bad vent.

 

[Oldyellow71]

Re: 1996 evinrude 112 spl stalling when throttling

Oh, sorry forgot to add one of the most important parts. If you or your friend see fuel coming out of the carb, then most likely the needle/seat is sticking and thats the only place it has to go. It come in the rebuild kit.

 

[tkdunn]

Re: 1996 evinrude 112 spl stalling when throttling

I will have to wait until tomorrow to get a spark & compression tester. The boat has an on board gas tank, it isn't easily accessible that I know of. We were testing the gas gauge on the initial trip and ran the tank dry and refilled with fresh gas + seafoam. This motor is really burning through gas. I went out to plug up my battery charger and could smell gas. This is why I think there may be a leak somewhere. I do have a shop manual but am hesitant to dig into the carburetors. There is a evinrude dealer in my area who will remove, clean, rebuild, install, and adjust linkage for $150-$200. Is that reasonable? Looking at around $70 or so for diagnostics. Since I'm not very familiar with boats at this point, is this the way I should go?

 

[Oldyellow71]

Re: 1996 evinrude 112 spl stalling when throttling

If you ran it out of gas I would check the fuel filter just to make sure you didnt pick up any crap from the bottom of the tank. Your built in tank should still have a vent on it, if you can find it try to see if it is clogged. As far as the shops around you , I am not sure, I would call around and ask. Here in Dallas the labor rate is $95 an hour on average. Boat carbs are pretty easy! Especially if you have already bought the manual, plus if you get stuck the pros on here can help you. Look in the iboats store to see how much the carb kits are, this site is usually one of the cheapest, or very close. I am a plane mech not a boat mech. I am on here cause I love to fish and can't afford to take my boat to a shop!! haha

 

[jtexas]

Re: 1996 evinrude 112 spl stalling when throttling

yeah, these carbs are remarkably simple devices. Nothing like automotive carbs. I'm not even a plane mechanic, just a DIY mech running a 31 year old outboard, and I've never even once put my boat in the shop, thanks to iboats.

click on the top secret file at the top of this forum and follow the link to carb cleaning and rebuilding.

 

[smitty403]

Re: 1996 evinrude 112 spl stalling when throttling

what was the cause of your problem. I'm haveing the same issue and we are trying to run out the gas now. ours seems to stall when throttled until it warms up. I changed the plugs but I was told that the gap was 0.30" which is less then the 7/16" above. I may go ang chage the gap to 0.44" and see if it makes a difference.

 

[tkdunn]

Re: 1996 evinrude 112 spl stalling when throttling

It was a bad power pack. There was no spark on one of the cylinders. Use the procedure someone mentioned to check spark. Someone had adjusted the throttle linkage to compensate for the power pack instead of fixing it so it had to be adjusted correctly. The leak was the choke primer under the engine cover.