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  1. 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.
  2. 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...
  3. 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...
  4. 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.
  5. 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.
  6. 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.
  7. 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...
  8. 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.
  9. 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...
  10. merc850

    Merc 500 Thunderbolt timing marks

    You have to setup the throttle pickup next with these instructions: A manual is a must and I would clean the flywheel and repaint it - if it cracks due to rust it's not a good thing.
  11. merc850

    1965 Mercury 900 Reverse Lock Cam

    Just call me Carl the 2nd.
  12. merc850

    power trim

    Yes if it's the external twin ram. Here are some instructions in case you don't have a manual. Don't try to drive the tie bolt out of the spacer, just remove one clamp bracket and the 2 nuts and pull it out.
  13. merc850

    When was there a 110 HP Merc?

    It was a 6cyl. engine - 1967
  14. merc850

    Need help. trying to find controls for a center console.

    This control box can be mounted on either side and from the bottom
  15. merc850

    1964 Mercry 65HP, internal wiring harness question.

    I have one like it in stock, compare the wire lengths. The plug is fine it's just the photo.
  16. merc850

    Take off bottom cowl to replace internal wiring harness?

    Here's a wiring diagram - the paint is very tough so you could use soap and water or an engine cleaner (Mercury PowerTune) and rinse it with a hose - there are drain holes in the cowling. The only wires I see going behind the switchbox are RED BROWN and ORANGE
  17. merc850

    Power trim not working

    If there are no visible leaks then follow the instr. in the manual especially the pump fluid level must be kept up during procedure - I use a LU gear lube pump - it screws into the fill hole. It looks like low fluid in the UP hoses. Is the reverse lock knob on the pump body turned full left...
  18. merc850

    Springtime preparation

    We have all worked on motors that have been neglected so to prevent more damage I have a list of important lube details For the guys in salt water Mercury makes an Anti-Corrosion spray that you can coat the powerhead and DS housing with. Keep your Merc from going bad!
  19. merc850

    Merc V200 (1979) Starting Issue - Starter not pushing up

    I have worked on those type starters and made this tool from an old CD drive case; your dimensions might be slightly different.
  20. merc850

    1974? Mercury 50 H.P. Motor??

    After viewing the images I would say that the motor has a lot of issues, leaking block? (above plug wires), heavily corroded LU that is going to be a headache to work on and the wiring could be disintegrating (not seen in pictures); even the shift or throttle cable is rotten. To be a reliable...
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