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  1. merc850

    Motor stand

    If you need a stand for displaying/working on your small Mercs this is my design for a cheap but solid unit. I made 2 and all I used was 1 sheet of plywood for each one; some screws, a circular saw, Sawzall and drill. You can use a router to dress-up the edges or create inlays.
  2. merc850

    Motor rewire

    Wire all the accessories to a terminal strip under the dash and run separate +, - wires directly to the battery thru a fuse or circuit breaker of adequate amperage; you can wire a tach into the harness plug if the brown wire from the 4 terminal side is moved to one of the yellow wires on the...
  3. merc850

    merc 650 4 cyl (1967?) timing and pickup

    First is the small arrow aligned with the mark on the flywheel? To do this easily I remove the magneto and disconnect the condenser then put it back with 1 bolt holding then connect a VOM to the side post and ground. That external piece connected to the side post is a mercury switch that can be...
  4. merc850

    merc 650 4 cyl (1967?) timing and pickup

    This is from a manual, a tach is a good investment.
  5. merc850

    Motor rewire

    If it is a 1975 here's a wiring diagram; (the coil and starter solenoid are physically different and in different locations), the distributor should have a ground wire from the housing to the block. I would buy a new harness and do it right, or you might have it catch fire or leave you stranded.
  6. merc850

    Early 70’s Mercury 650 Stator

    If this is a 3cyl. model this wiring dia. might help.
  7. merc850

    Early 70’s Mercury 650 Stator

    Here's a way of checking the dist. without the Mercury tester
  8. merc850

    76 Merc 85hp Trigger Plate Test Help

    You have to measure the resistance of the components
  9. merc850

    Mercury outboard 140 spark issues

    I tried that on a dead trigger you have to remove the rubber grommet and use a small ball tool on a Dremel hand grinder to clear out the epoxy in the end of the chamber then, solder some new wires onto the 3 posts. I did this just to see what is in there. On my motor I have a new CDI unit.
  10. merc850

    Merc 900 90HP ignition wiring help

    That's a point ignition ( 2 sets of points are under the cap); the red terminal cap must be removed first if you are checking the cap! It looks like you have a different control box than the original if all those wires in the 1st photo are from it. Here's a diagram that should match the engine...
  11. merc850

    Old Merc Model 200 tiller 20hp

    "Full handel had broke off" if you're talking about the tiller handle it's possible that it's not set up correctly and instead of "START" the spark is advanced to "RUN" which would be too far advanced for starting; see if this image helps.
  12. merc850

    Mercury outboard 140 spark issues

    The serial Nr. should be on the plate between the clamps. The blue switch is to cut off the ignition if the motor is knocked out of the water. I've found the serial range 3293234 thru 3502805.
  13. merc850

    Mercury outboard 140 spark issues

    Have you looked in the dist. cap maybe the rotor is cracked or the contacts are corroded; there's a timing belt under the flywheel and it turns the distributor, when you take the cap off see if you can turn the rotor gently - if it turns around the belt is ruined. Fig. 3 shows the belt and dist...
  14. merc850

    1957 silent 6 model 1056344

    This is from the 1965 and prior manual, the co-pilot locking ring might be accessible by tilting the motor up.
  15. merc850

    '76 Merc 85hp Wiring from Engine to Control Box Help

    Right from the manual; if yours is really a 1976.
  16. merc850

    Surface gap versus standard sparkplugs

    A little history on surface gap plugs
  17. merc850

    1977 1150 lose power when at load

    OK, the only thing that is not new is the trigger in the distributor? A failing trigger will work sometimes then not; do you have spark now? You can test the trigger by following these steps: The vent orifice is for the back drag carb fuel economy circuit it reduces the atmospheric pressure at...
  18. merc850

    85hp Mercury Trim Pump Nightmare

    Does the motor turn over? If so but the rams don't move then you should bleed the system; if not then check the brushes in the end cap; there's also a circuit breaker in the end cap that might be dirty - you can clean it with fine sandpaper
  19. merc850

    1973 Mercury 850 Thunderbolt issues

    I had the same problem but it was the trigger that was going, before you throw money away use these steps to trouble shoot. CDI sells the trigger and switchbox.
  20. merc850

    Mercury 65 HP 4 Cylinder Wiring Diagram

    After you clean the carbs and check the fuel pump you should check the magneto; if you're serious about this motor a manual is a must.
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