Mercury Boating - Answered Questions & Fixed Issues


That serial number was produced during the years of 1988 through 1990.

Mercury Boating | Answered on Oct 21, 2019 | 123 views


Take out the spark plug. Hold a drinking straw up to the spray nozzle and shoot the fog into the spark plug hole.

Mercury Boating | Answered on Sep 30, 2019 | 133 views


Depends on the HP of the motor. The long shaft will only ad a few lbs. See this link for motor specs on weights.

https://www.nadaguides.com/Boats/2005/mercury/outboard-motors

Mercury Boating | Answered on Sep 25, 2019 | 124 views


Best not to do it as you will get maybe 2 mph. Also, I believe it is ******* to modify 1996 and later motors.

Mercury Boating | Answered on Sep 09, 2019 | 137 views


If you know the year or model number, you should be able to find the diagrams at http://www.crowleymarine.com. Otherwise call, I've known them to be really helpful.

Mercury Boating | Answered on Jul 12, 2019 | 1,393 views


Any outboard 2 cycle after 1965 will run on 50:1 approx 500ml or half a quart per 5 gallon tank.

Mercury Boating | Answered on Jul 06, 2019 | 139 views


Check the fuel filter for blockage and check the plugs for spark. If no spark, you could have bad coils. Here is a video on how to go through the checks.

Mercury Boating | Answered on Jul 06, 2019 | 211 views


(Carburetor Adjustment - Single S/S Adjustable Needle Valve)

Initial setting is: Slow speed = seat gently, then open 1-1/2 turns.

Start engine and set the rpms to where it just stays running. In segments of 1/8 turns, start to turn the S/S needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running.

Eventually you'll hit the point where the engine wants to die out or it will spit back (sounds like a mild backfire). At that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting.

Note: As a final double check setting of the slow speed valve(s), if the engine has more than one carburetor, do not attempt to gradually adjust all of the valves/carburetors at the same time. Do one at a time until you hit the above response (die out or spit back), then go on to the next valve/carburetor. It may be necessary to back out "all" of the slow speed adjustable needle valves 1/8 turn before doing this final adjustment due to the fact that one of the valves might be initially set ever so slightly lean.

Mercury Boating | Answered on Jun 19, 2019 | 141 views


Sounds like the gas isn't flowing freely into the carb. Check to see if the gas lines are open, no obstructions. Also check the gas tank, I there is a screen on the gas inlet tube and that might be plugged.

Mercury Boating | Answered on Jun 16, 2019 | 166 views


There are some universal ones available, but I just stick my 9hp outboard in a bucket of water and flush that way.

Mercury Boating | Answered on Jun 11, 2019 | 152 views


Product Line Year H.P. Model Number Model Description MERCURY 1986 45 1045776 45/50 HP

Mercury Boating | Answered on Jun 09, 2019 | 167 views


Looks like this;
Product Line Year H.P. Model Number Model Description MERCURY 1985 7.5 1007205 7.5 /9.8 H.P.

Mercury Mark 75... | Answered on Jun 09, 2019 | 144 views


Product Line Year H.P. Model Number Model Description MERCURY 1983 25 1025523 MERC 25

Mercury Boating | Answered on Jun 09, 2019 | 160 views


Product Line Year H.P. Model Number Model Description MERCURY 1978 115 1115628 MERC 115

Mercury Boating | Answered on Jun 09, 2019 | 152 views


In my part of the world, break in is 25.1 then run 50.1. Back to mercury school for a refresher course.

Mercury Boating | Answered on Apr 14, 2019 | 1,311 views

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