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  1. merc850

    Water in lower unit

    The oil and water have separated after sitting so long, was there any rust in the water? The seals might be bad; the washers under the fill/drain screws might be bad or missing - there is also a seal at the shift shaft or the driveshaft is pitted and lets water in. Remove the water pump base...
  2. merc850

    1967 Mercury 500 "no spark"

    Here's a page from the manual that will aid your repairs.The rotor should be "glued" on I use a bit of Permatex gasket shellac, this will hold it on but allow easy removal later; which you will have to do in the future to reset the points.
  3. merc850

    Warning about upper shift shafts!

    Anyone who owns a 70's and earlier motor should take a good look at the upper shift shaft, I fixed mine 5 yrs. ago by welding in a piece to "jump" the corroded area and this year it failed leaving me without reverse; so I had a guy weld it but it had twisted and I couldn't get it to line up...
  4. merc850

    1968 Mercury 110 (9.8) flooding on idle - any idea why?

    Here's the proper method for setting the needle/float; after you reinstall the carb run the engine at approx 1200 rpm in gear and adjust the low speed needle until the engine runs smoothly.
  5. merc850

    850 wont crank over, no power to gauges...

    Follow this diagram
  6. merc850

    Merc 85hp 1973

    Only thing different is the coil shape; someone has altered (maybe the switch is for the choke) or replaced the control box: it should be this one, I would replace any bad wires even if it means buying a new harness(es) a fire onboard can be fatal!
  7. merc850

    Merc 85hp 1973

    See if this diagram helps, there's no factory lanyard kill switch.
  8. merc850

    73 650 Mercury Starter/Solenoid diagnostic Help?

    I think your next step is to disassemble the starter check the starter brushes and clean it if needed Brush dust can pile up at the bottom and cause problems. Here is a Kiekhaefer starter
  9. merc850

    Outboard Lubricant Maintenance Interval Guide Chart

    Everyone wants their Merc to run forever, following this chart might help,especially in salt water.
  10. merc850

    Trigger Replacement mid 80's Mercury 50hp

    Do you run the boat in salt water? if so I'd replace the trigger and get a can of Mercury's Corrosion Guard spray to treat the wires and fittings and use this guide for further protection of the motor; salt water's a killer.
  11. merc850

    Starting a 2 cycle Merc. Verified

    This is a page out of my owner's manual; maybe it could be posted in the sticky section
  12. merc850

    1974 Mercury 1150 issues

    Take the cover off the ignition pulley(5/16 bolt) and see if it lines up like this if not follow the steps; one problem could be the trigger - there are instructions for testing it on this site; download.
  13. merc850

    Twin 1966 Mercury 500's

    Don't run deep cycle cycle batteries they take more power to charge than those alt. put out, normal marine starting batteries (not maintenance free) are fine one for each motor both motors should have alternators. One of those props might be cupped to reduce cavitation.You might want to check...
  14. merc850

    Twin 1966 Mercury 500's

    Once again someone told you something that is not true! {probably told you the reed valves affect the waterpump too} a motor with a good working waterpump will spray a good stream out of the tell-tale, the hole may have something in it push a same size drill into it and gently twist it, if you...
  15. merc850

    1979 Mercury 40 hp low throttle in forward gear, high throttle in reverse gear. Help

    Maybe you have the wrong box. This was used for quite a few years on Mercury outboards and replaced the 2 lever OMC type.
  16. merc850

    79 40hp tach Q

    If that's a new tach and not a Quicksilver part one you have to run a separate wire from a yellow wire on the rectifier to the sender post on tach. Set the tach at 6p. Connect the black and white wire to + and - and the light to your running light switch.
  17. merc850

    1974 Mercury 500 (50 HP) Won't fire, has compression, stumped.

    Take the cover off the dist. pulley (5/16") bolt and see if it is the same as this manual page, are you using L77V plugs they are surface gap no side electrode.
  18. merc850

    1974 Mercury 500 (50 HP) Won't fire, has compression, stumped.

    Don't worry about comp it sounds good I think you have an ignition problem. That system uses a magneto style ignition with no points so the battery only turns motor over; have you checked the ignition driver on the port side of motor? It has a cap, rotor and plug wire posts and should be clean...
  19. merc850

    Mercury 500 click while manually turning prop

    It's not weird if you see a diagram of the components Nr. 11 are the reverse dogs - and don't shift into reverse when motor isn't running.
  20. merc850

    1971 merc thunderbolt 500 50hp 2 stroke 4cyl wont start even tho i .....???

    Are you saying that the starter motor won't turn the engine over or the motor itself won't start? If the starter isn't turning its bad/corroded cables or solenoid or needs repairing, if it isn't starting it could be no fuel or the switchbox/trigger assem./coil. That uses a magneto driver...
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