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| What year 40 HP Mariner? Info? |
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Brian Campbell
New member
Username: bcamp1111
Post Number: 1
Registered: 07-2009
| | Posted on Monday, July 06, 2009 - 10:23 pm: | 
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I have a 40 horsepower Mariner. It says "Made in Japan" and 676B 404081. It also says Mariner 40BE.
I just bought a pontoon and this motor came with it. The guy said it's been out of the water for at least two years. Tonight I hooked up a battery and cranked it in neutral to check the compression. I got a reading of 122 (top) and around 120 (bottom).
Can anyone tell me how to proceed with this motor? What steps should I take next or anything to be mindful of? |
Graham Lamb
Senior Member
Username: galamb
Post Number: 5550
Registered: 05-2007
| | Posted on Monday, July 06, 2009 - 10:39 pm: |
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Brian, 1979 "B" model Mariner built by Yamaha with Yami parts for Merc.
Decently well built motor but not as prolific a the "C" model which followed it, so some parts are a little more scarce.
Since it's been sitting I would, at minimum, replace the spark plugs, impeller and lower unit oil.
Mix your oil and gas a little heavy like 30 or 40:1 for it's first bit of run time (let it idle for 15 or 20 minutes with the heavy mix) and a teaspoon of oil in each cylinder followed by a few rotations of the flywheel by hand wouldn't hurt either (other than making the initial start a little rough and smokey).
Once it is running you will be able to determine if the carbs need to be pulled and cleaned - you may get lucky.
If it seems to be running half decently I would run either some "Seafoam" with the gas or grab a spray can of Merc's "Power tune" and just follow the directions on either of the cans - they will clean the carbon, gunk and other cooties out of the powerhead itself quite nicely. |
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