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  1. merc850

    Mercury 350 35hp stator

    I know where to find the parts - just look online. The points are set at .020" on the high side (lobe) of the cam.
  2. merc850

    MERCURY 200 20HP BASKET CASE QUESTIONS

    Here's the wiring diagram for the 75
  3. merc850

    Trim tilt pump

    The serial Nr. is at the top on that silver tag in pic 2. If your motor has the 4 hose cylinders you need a trim pump, all the fittings and the wiring harness - I wouldn't use just any hyd. pump the proper one has internal passages that allow the motor to kick up if you hit an underwater object.
  4. merc850

    What prop?

    A tach will help you get it right, the full throttle rpm range is 4800-5200, I would choose one that gives you 5200. A new tach can be hooked up to one of the yellow wires on the rectifier.
  5. merc850

    Missing serial and model numbers

    Look on the top of the block, a serial Nr. looks like [eg.] - "4085864". Yes a picture of the cowling will help.
  6. merc850

    Drain line on Mercury 7.5 hp motor

    Looks like an oil drain line that moves excess oil up to be burned/lubricate the upper bearing. The only way to get more water flow is to replace the impeller and make sure the water tube is clear.
  7. merc850

    No voltage regulator on older Mercury. Can I add one?

    Unregulated systems started in 1955 with the Mark 55 and were used up to the '80s and having been a boater for 50 yrs. I have never had a battery "boil over or spew acid" neither have the guys I boated with, the electrolyte would slowly go down over a season but no more than Granpa's old chevy...
  8. merc850

    Engine shutting off and bulb without pressure.

    Disconnect the fuel connector from the motor and pump the ball, if it gets hard and stays hard it's OK - if it pushes back into the tank the check valve is no good.
  9. merc850

    No voltage regulator on older Mercury. Can I add one?

    You can add a regulator to that system and then you can use a maintenance free battery, if you are using one now there is a possibility that the electrolyte will boil off - those systems were used with non-maintenance free batteries.
  10. merc850

    1969 Mercury 650 2 stroke 4 cyl. Switch box swap

    No problem they used that system until 1976.
  11. merc850

    1969 Mercury 650 2 stroke 4 cyl. Switch box swap

    First you have to wire it correctly - the wires are color coded red to red terminal etc. Have you opened the ignition driver to see if the rotor and cap are in good condition? You unbolt it from its adapter and remove it.
  12. merc850

    1969 Mercury 650 2 stroke 4 cyl. Switch box swap

    The switchbox you have now is used with the Lightning energizer which generates the power to activate the box, the other type uses 12v to generate the spark and a trigger system to fire the coil. They are not the same.
  13. merc850

    1998 Merc 150 Stiff Steering

    What is the problem? pull the cables out clean tubes and outer cable sleeves, extend the cable assembly and clean and lube the inner liner. Use an anti-corrosion grease like Mercury's. put the cables back and grease the outer sleeves, grease the fitting for the swivel tube and the tilt tube...
  14. merc850

    Shift Shaft removed, now can't get back into gear

    To properly attach the LU follow these steps This is how I do it in about 60 sec.: Turn the LU shift shaft by hand counter-clockwise until it stops, then with Vise Grips tight on the bottom of the shaft turn it a few more degrees CCW until it clicks into a stop, this should be neutral - check...
  15. merc850

    62 merc 850 6cyl

    This might help you until you get a manual, the proper firing order should be on the back cover where the spark plugs are.
  16. merc850

    Mercury Green Tank KG5 Coil Adjustment?

    Try this site they do nothing but very old Mercs http://johnsoldmercurysite.com/phpBB3/index.php. I think the motor needs a complete tear down, there are needle and ball bearings inside that could be damaged not to mention the piston rings. You want a motor that will be reliable!
  17. merc850

    1972 Mercury 500 50 HP

    I can't watch!
  18. merc850

    Restoring a 1978 Mercury 900 90hp "Tower of Power" Need Help!

    You will need the serial Nr. before you try to get a manual, the Nr. might be on the clamp bracket, between the clamps, or on the block near the starter.
  19. merc850

    1957 mercury mark 10

    Try this company https://www.oldmercs.com/category_s/457.htm
  20. merc850

    Where should water come out if no tell tale?

    They put "pee holes" on the port side of the motor (left, looking from the back) yours might be clogged with sand, look at the bottom of the top cowling for the hole and push some wire into it to see if it is clear.
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