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Old 08-06-2007, 06:58 PM
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Default 115 mercury hard to start

My 115 outbrd mercury is very hard to start the first time while I have my earmuffs on the motor but once I get it running I can cut it off and start it back up no problems.And when its in the water its also hard to start the first time but when I get it running it will run all day.But when I cut the engine off to fish and try to get it running again sometimes takes me 15 to 20 minutes.Any suggestions
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Old 08-06-2007, 07:08 PM
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Default Re: 115 mercury hard to start

What year and model......4S, OPTI, Carbed????
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Old 08-06-2007, 07:12 PM
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Default Re: 115 mercury hard to start

Im sorry but i dont have the model # but it's a 1996 115 outbrd mercury 4 clinder.it has 4 carps on the front side of motor.i was told it was a 2 stroke motor
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Old 08-06-2007, 07:56 PM
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Default Re: 115 mercury hard to start

Carbed two strokes are very hard to "cold start". I do not know but I have experience with carbed yammies and johnsons and even if you ran it hard all day....the next morning would be a 10 minute start up procedure. I asked of the model to jumpstart the thread....Im sorry I have no suggestions. And I did not mean #.....just type.
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Old 08-06-2007, 07:59 PM
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Default Re: 115 mercury hard to start

These don't like to run on land, but the primer must not be working anymore. The primer has a black button (manual) you can press if the circuit fails.
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Old 08-06-2007, 08:43 PM
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Default Re: 115 mercury hard to start

Make sure it's throttled up (not in gear) when you are starting it and don't forget to choke it and make sure the bulb is hard. That worked like a charm for my 97' 115 merc every time.
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Old 08-06-2007, 09:25 PM
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Default Re: 115 mercury hard to start

my 2 stroke, carbed mercury motors have always been slow to start. once they're warmed up/been going for a little while, they're fine... the trick is finding a "process." i've had my 2003 for two years now, and i'm still trying to find the perfect starting procedure. so far it's similar to supernailman's. good luck.
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Old 08-07-2007, 08:33 AM
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Default Re: 115 mercury hard to start

I had twin 1997 Twin Mercury 115's same problem always an adventure to cold start. I think the biggest problem with those is that below a certain RPM range they would run on 2-cylinders to conserve fuel.
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Old 08-07-2007, 08:37 AM
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Default Re: 115 mercury hard to start

One thing that will help in starting about any carbed engine is to make sure the engine is level before cranking, not tucked or trimmed up.
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Old 08-07-2007, 08:51 AM
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Default Re: 115 mercury hard to start

That should not be that hard to start. Prime the bulb, then press the primer down and count 10, then crank it.
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Old 08-07-2007, 09:28 AM
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Default Re: 115 mercury hard to start

I have had several carbed Mercs in the past and have known others who have had them. They can all be hard to cool/cold start.

I have been able to get them all to start by bumping the key with the throtttle in the idle position (in other words, don't turn the key for more than a second or so.) You may have to do it a dozen or so times, but it always worked for me. When really cold, apply choke while doing the above.
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Old 08-07-2007, 09:33 AM
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Default RE: 115 mercury hard to start

I would invest a couple of hurdred bucks to take it to a mechanic and have him give it a quick check then have him show you how to start it, from cold. Rob
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Old 08-07-2007, 09:38 AM
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Default Re: 115 mercury hard to start

I had a 2001 Merc. 115 carbed. It was very difficult to start if the battery did not have a good charge (they are not fuel injected so even with a full charge they can be a bugger). Problem was particularly acute if I had not used the boat in a while (battery charge would trickle down)...then it would be extremely difficult to start. If I hooked jumper cables up from my truck to the motor battery it would then fire up after 3 or 4 tries. Fully charge your battery and see what happens. If it makes a difference, you may want to consider an onboard charger or a battery kill switch (so it doesn't trickle down when not in use) or a portable jump starter.
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