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  1. merc850

    Mercury 9.8 2 stroke Thunderbolt egnition.

    I have the 1975-78 and 1939-65 manuals so that's why I can't help you.
  2. merc850

    Mercury 9.8 2 stroke Thunderbolt egnition.

    You need the 1966-1974 Mercury Outboards service repair manual - C-90-68647 there are some on ebay now.
  3. merc850

    25hp problem

    Did you clean the carb? could be the high speed circuit is fouled up or the fuel pump is not pushing enough fuel.
  4. merc850

    2021 Mercury 115 Pro XS cavitating

    It looks to me that the motor is just too high, the anti-cav plate should ride slightly below the surface of the water when running. Have someone drive it when you're running it on the water and you look at its height.
  5. merc850

    Part interchange

    I think that the only upgrade would be Thunderbolt ignition which would require the Lightning Energizer, switchbox and coil; (ignore the color coding) if you're lucky the splines on the Ignition driver will match. you could also replace the plate rectifier with the diode type.
  6. merc850

    2001 25hp Big foot

    Clean the battery terminals and re-connect the wires (the motor doesn't need 12v to run just to start) the direct short could have caused a bad contact situation.
  7. merc850

    aftermarket coil

    If it uses the large red coil try to find one on ebay etc. I wouldn't use an auto coil - the voltage to the Merc coil is higher than 12v. and you might destroy the switchbox. Later models used a smaller blue one which is still available if you contact a dealer they could tell you if they are...
  8. merc850

    1963 650hp Tachometer hook up.

    Here's one from Faria that looks kinda retro and clean Here's mine that has lasted 25 yrs. Genuine Mercury 1980
  9. merc850

    1963 650hp Tachometer hook up.

    What is the model Nr. of the tach, you could search for the instructions, if it needs a module search for that too. If you want to go modern just buy an alternator driven one that attaches to one of the yellow wires.
  10. merc850

    Mercury 9.8 2 stroke Thunderbolt egnition.

    Do you have a manual? Here are the fuel pump instructions - as I stated before 1973-1974 as it says Mercury Marine not Kiekhaefer Mercury (1972).
  11. merc850

    Mercury 9.8 2 stroke Thunderbolt egnition.

    1973-4; the serial Nr. should be in that space beside the troll lever; it looks like it's been scratched off in the photo. The fuel line is going directly into a filter on the side of the carb ( someone posted that this piece is NLA) and the fuel line might break it - originally there was a...
  12. merc850

    Wiring Harness Meltdown

    Did you have both charging systems feeding the battery(s) at the same time? that could have caused it. Usually on a dual install with 1 battery you have 1 motor's charging system disabled. Where does that wire come from?
  13. merc850

    Metal Shavings

    I'm saying that if it's really bad the shaft will rotate more than if it's within spec. (Should've said Forward)
  14. merc850

    Metal Shavings

    You can check the gear lash by having it in N remove the prop and gently turn the propshaft back and forth, if it moves a little with some tapping it should be OK. If it turns a lot you have a shimming problem! Push the shaft in and out to see if there's end play there shouldn't be any. Also if...
  15. merc850

    1986 35 HP merc reverse lock cam position

    It looks to me like it's 180* rotated - lift it off and set it back on ramp forward.
  16. merc850

    Mercury 90 2 Stroke fouling one plug after some use, stalls when accelerating

    1990 Mercury 90 stalling when going into gear after extensive rebuild
  17. merc850

    1974 Mercury Tower of Power water pump replacement.

    First buy the kit using your serial Nr. tilt the motor up as far as you can on to tilt lock, remove the screws from the housing including the FLUSH (if applicable) and drain the gear lube into to a disposable container. Undo the nuts that hold the LU including the one under the trim tab and...
  18. merc850

    1975 meecury 65hp outboard motor

    Here's the engine from 2 sides
  19. merc850

    Merc 2006 50 hp 2 stroke carb tubing size help

    Use drill bits pushed into the old lines, the one that fits is the I.D. size. The clamps used on auto transmission hoses look like a good choice.
  20. merc850

    Mercury 20hp carb id

    Heck I'd just pump up the bulb, check for leaks then try to start it, you should replace the waterpump impeller first and the fuel pump diaphragm as well. It looks like there's a part Nr. on the top of the mounting flange, that could help; according to my research the kits fit 1973 thru 1980...
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