20 Most Recent Mercury 4-Stroke 3.5 HP Outboard, Manual, Long Shaft Questions & Answers


Yes it is possible

Mercury 4-Stroke... | Answered on Mar 07, 2019


Is this a two stroke?-If it is you most likely have a primary seal going bad (crankcase seal on the ignition side will lean it out,leaking seal on the other-side of assembly will do just what your describing)Hope this helps you out.....

Mercury 4-Stroke... | Answered on Feb 11, 2015


Check timing,check for crankcase oil seal leaks,also look for intake leaks......

Mercury 4-Stroke... | Answered on Aug 07, 2014


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

Mercury Boating | Answered on Oct 21, 2019


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


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


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


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


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


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


(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


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

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