Question about Seloc Mercury Outboard Engine Repair Manuals SEC-1416 1990-00 2.5-275 HP

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Free Mercury Outboard ONLY, 2-40HP 1965-1989 Repair Manual 1-2 Cylinder, 2 Stroke

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I have a problem with my 2 stroke 20hp mercury 1989,when I run 10-90% throttle it's works fine but when in 100% its only runs in 90% and doesn't sound normal like it's not burning right.

Posted on Feb 11, 2014

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Yamaha outboard 15lh backfire or missing low rpm


Hello Bill, have you replaces the spark plugs? Do this first.
If it still backfires/misses.. have the carb cleaned and set by a competent professional.. if it still does this, remove the flywheel and see if one of the magnets has broken or come loose...(my own experience!)

Jun 13, 2017 | Seloc Yamaha Mercury Mariner Outboards...

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Mercury 1989 60 HP Outboard Motor manual to find gas to oil ratio


50:1 But if your doing mostly low rpm cruising (trolling) then you could reduce that a bit to 75:1 to help reduce smoke. If you do mostly mid to higher rpm cruising, then 50:1 (1 pint to 6 gallons. )
Or 200mls in 20 liters if your Canadian.

Feb 26, 2016 | Seloc Mercury Outboard Repair Manual, 1965...

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My boat motor has low compression @ number 1 cylinder how can I fix it


2 possibilities:
-1 Your head gasket is burned. Caution, some Mercury engines have no head gaskets. I could tell if I had your serial number.
-2 Your cylinder has seized. If it's the upper cylinder, you'll have also to check your cooling system! Look at your spark plug if you can't see some 'aluminum' deposit on it. Or, inspect the inside of that cylinder with an endoscope.
Such an old engine is mostly not worth a complete overhaul. So, in case of seizing, just hone that 1 cylinder and use a new piston with rings.

It's in any case better not to use that engine in this state.

Mar 06, 2015 | Seloc Mercury Outboard Repair Manual, 1965...

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Have 115 Hp mercury outboard motor missing at full throttle and on idle. At mid throttle it is running fine. Any Idea what the problem could be. Thanks, Milton


Have your spark plugs changed AND carbs cleaned and adjusted.
Usually that can also be caused by a seized advance system ( plate under the flywheel, commanded to turn with the throttle linkage... )

Aug 16, 2013 | Seloc Mercury Outboard Repair Manual, 1965...

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