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75 hp Mariner "Cold Natured" Need Help, Please

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75 hp Mariner "Cold Natured" Need Help, Please

Old 08-11-2013, 05:35 PM
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Default 75 hp Mariner "Cold Natured" Need Help, Please

I just bought a 1995 Monarck Pro 1650 with a 75 HP Mariner 2 stroke motor. I bought the boat from a friend of mine who bought the boat New. The boat has always been garage kept and well taken care of and has Very Low Hours. He may have fished with the boat 2 or 3 times a year, then put back in the garage. I have fished with him several times over the last 15 years and the boat has Always been "Cold Natured", He said it has been like that since new. Once you get it started it runs great all day. But the first time starting it takes several tries before she starts. You can then fish al day, shut the boat off for hours and it will always start right back up easily, it's just the first initial first start thats difficult and cold natured. What should I look at to help with the cold starts or is this something that's normal for 75 hp Mariners? Sorry about the long post, I just wanted to give a little history to help with the answer.
Old 08-11-2013, 05:50 PM
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What type of choke mechanism or fuel enrichment device does it have?

Also, what is the id number for the motor?
Old 08-11-2013, 05:55 PM
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Originally Posted by jethro1 View Post
What type of choke mechanism or fuel enrichment device does it have?

Also, what is the id number for the motor?
The boat is still in my friends garage, will bring boat home the Wednesday. I will post all the information you requested then and I hope you can reply.
Old 08-11-2013, 06:28 PM
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I have a 94 merc 75 it is essentially the same engine. It starts like crap but once its running it will run all day with just the touch of the key. It starts up so bad and smokes so much someone once called the FD to put out a potential marina fire a few years ago. Typical Mercury product. I also use it very little. Yesterday was the first time I took the boat out that it is mounted on in 2 years. Once running it ran good not great. Really rough at idle. Gonna try to Seafoam treat it then change out plugs this week.
Old 08-12-2013, 06:01 AM
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Check to make sure the primer solenoid "clicks" when you push the key in. Key must be in the "on" position. If it clicks, pull the small hose that runs from the solenoid to behind the carbs. Push the key in again and confirm that fuel is squirting out the primer solenoid. If not replace solenoid. If it is, try pushing the key in about 5 or 6 times before a cold start. Advance throttle about half way and then start. Have had two or three of these engines and that seems to work. Oh, and don't forget to pump the primer bulb.
Old 08-12-2013, 06:44 AM
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If you're running fuel with ethanol, it makes the problem worse. Ethanol as an oxygenator makes the engine run a little lean, which destroys cold engine performance.
Old 08-12-2013, 06:59 AM
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check the small elbows going into the intake, from the enricher system.

I´ve seen cases where the plastic elbows were blocked from the manufacturing process/not cut open
Old 08-12-2013, 08:51 AM
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I had a merc classic which was essentially the same engine, it had a lever which you would raise to increase idle speed - key would need to be pressed in for choke.

It was pretty hard to start, since new. I got around this by starting it on muffs at home before i would head out fishing and never had a problem in about 15 years of ownership. The engine is still running strong with the guy i sold it to.

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