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Cold Natured 75 Hp Mariner? Need Help

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68rs327

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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. :confused:
 
I have a 1992 merc 40 classic and was told the same thing by everyone, very cold natured, However there is a specific starting sequence you can look up on google ill try to find it if i can but, turn the key to on, push in the key for a 5-8 second count then with the key still pushed in try to start. If it doesn't start the first time do not hold in the key the second time but be pepared to pump the throttle. I can get mine started in 3 key turns or less everytime now.
 
Spencer Breeden said:
I have a 1992 merc 40 classic and was told the same thing by everyone, very cold natured, However there is a specific starting sequence you can look up on google ill try to find it if i can but, turn the key to on, push in the key for a 5-8 second count then with the key still pushed in try to start. If it doesn't start the first time do not hold in the key the second time but be pepared to pump the throttle. I can get mine started in 3 key turns or less everytime now.
Click to expand...
Thanks for the reply.
If you find the starting sequence, please let me know. Until then I will try what you do. I though maybe something needed to be changed out or repaired on the motor. But, my friend said it has been "Cold Natured" since he bought it new? If anyone else has any ideas, please let me know.
 
Could be a couple issues here.

You say stored in a garage and well cared for but only used 2 to 3 times a year - that's NOT good for a motor - it wants to run - if you don't run it, it needs MORE maintenance than if you run it all the time.

There could be all manner of cooties, sludge, crud in the fuel system unless it was drained after every use (since it sat for weeks or months between use).

The 75 Mariner is 99% the same as the prolific 90 horse Merc which may be the most popular motor on the planet (stayed in production, virtually unchanged for almost 30 years).

These do not have starting issues in general (as a model run).

Start by cleaning the carbs. Try the easy way first. Fresh gas dosed with Seafoam OR grab a can of Merc's "Powertune" and follow the instructions on the spray can - it may work. If not the carbs will have to come off and be cleaned.

In any case add some stablizer to your gas - and don't gas up without it - 100% essential unless you are going to burn all the gas in the tank in the course of a weekend.

As to the "cold" starting procedure.

Just about every electric start 2 stroke Merc produced in the last 35 or so years is started the same way.

The key has a few positions - one click over from "off" or "stop" is the run (or ON) position.

On a cold start you turn the key to ON.

Push the key "in" and hold for 10 to 15 seconds. That activates the electric choke (enricher system)

The enricher is simply a valve that opens and allows fuel to (leak) down into the carb throats - it's not being "pumped or pushed", so hold it for those few "long" seconds.

After 10 - 15 seconds stop holding the key "in" and then turn it to the start position (next click over).

If it doesn't start after a few seconds, let the key return to the run position (on it's own) and give her another 10-15 seconds of "choke" (push her in again).

If it doesn't start after the second attempt, after "re-choking", you have a problem that needs attention.

In extremely cold weather (very early spring/late fall up north) you may have to choke it for as much as 25-30 seconds. During summer months, 15 seconds should be more than enough...
 
No such thing as a " cold natured " motor.-----Operate the manual fuel pump to fill the carburetors.--Advance the throttle only lever.-----Push key in while cranking until motor starts.--------Push key in untill motor warms a bit.----Slow motor to idle and let it warm up.---------------If cold start problems persist have the starter motor checked out, they are often damaged by excessive cranking.
 
..."
The 75 Mariner is 99% the same as the prolific 90 horse Merc which may be the most popular motor on the planet (stayed in production, virtually unchanged for almost 30 years).
"

Graham: Is that the 84 cube triple?

Jeff
 
Yes, should be - the 90 horse block - 84.6 cube (1.38'ish liters), loop charged 3 cylinder.

Sometime in the mid/late 80's the 70, 75, 80 and 90 horse all shared the 71.1 cube (1.17 liter) block. It was a little small for the 90 so when they tweaked things in mid 1994, they dropped the 70 and 80 horse, switched to the larger block and added the 65 Jet to the group.
(at this point I am assuming that the motor would have been new with the boat - either a 94 1/2 or 95 with the larger block)

In 2005 they stopped production of the 75, but used their "EPA points" to continue building the 90 horse which was prolific on "package deals" such as Tracker etc. When they ran out of points they continued to build the 90 for "export only" (we could get "brand new, current model, 2 stroke 90's up here until last year).

In 2012 they totally ceased production of their "non-DFI" 2 strokes. So last year we still had 150 EFI's, 90's, 9.9's and 15's in Canada.

Sorry, I wander :)
 
I have the 90 you're talking about. It has initial starting issues. I know and use the correct starting procedure. I even bought a new control harness with the Quicksilver 2000 box rather than the 3000 because the fast idle lever was easier to get to and was a better control. Mine is a little better since I took my carbs off and inspected them. Found some pieces of black matter in #1 low speed circuit. Must be from the black fuel lines. Sea Foam kept the varnish out.

Anyway, I think the problem comes from sitting long periods of time. Mine sits for 2-3 months without running. Maybe it's because the engine is so fuel efficient. I don't know but it doesn't bother me. I don't wear the starter out and it spins up like it should. New batteries, connections clean and bright and tight. After the first start of the day, it will start before you can get your finger off the key. Can't beat that.

Mark
 
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