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  1. merc850

    Mercury 150 not performing well under load and drinking gas.

    "without any load to 6000 plus rpms" is not recommended, maybe you damaged it.
  2. merc850

    72 Mercury 500 No Spark

    It was a 14' runabout that I had for a few years; don't know the voltage but anything is a start. Here's my current rig .....
  3. merc850

    72 Mercury 500 No Spark

    The Ignition driver provides the power for the switchbox so it doesn't need to have 12v going in to it; this is an electronic version of a magneto. All you need is a wire to ground it out for stop. The 500 is a great motor smooth running and powerful and they made them for decades! Have you...
  4. merc850

    72 Mercury 500 No Spark

    All I have is the 1975 year but it should? be the same; did you check the belt?
  5. merc850

    72 Mercury 500 No Spark

    Yes the cowl must be grounded as well as the ignition driver and all are grounded to the neg side of the battery via the starter. None of the posts on the switchbox should be grounded for RUN. Disconnect the ground from the mercury switch until engine is proven to run. This motor uses the...
  6. merc850

    72 Mercury 500 No Spark

    Clever bit of engineering I have the 1975 wiring diagram for your reference it might be different than your motor
  7. merc850

    1976 Mercury 850 value

    The internal harness is the most important as it carries power to the starter (lots of current) Mercury Marine 414-3369 Internal Engine Harnesses - CDI Electronics Price: $203.59 from this site Wiring diagram
  8. merc850

    1976 Mercury 850 value

    Replace the motor wiring harness and it will be worth more and be safer too.
  9. merc850

    1976 Mercury 850 value

    1975 and older used a distributor.
  10. merc850

    Mercury 9.8 has spark, won't start

    Are the plug wires on their correct plug?
  11. merc850

    1150 Link & Sync Question

    The hull looks like a displacement type, a V type hull will attain a higher speed as it rises up out of the water; so that could be an issue. "generic mercury/quicksilver unit" is it an alternator driven or switchbox one?
  12. merc850

    115 mercury carb problems

    I caught them building a nest on my flywheel!
  13. merc850

    1979 115 hp 6 cyl inline 2 cycle timing/carb adjust

    2 things to note: 1: the throttle cable is adjusted to set the idle remove the brass fitting from its holder and turn it until the throttle arm makes the lever hit the idle stop - 2: you have to adjust the low speed in the water in forward gear; set the needles 1 1/4 turns out from seated to...
  14. merc850

    90Hp torque spec

    I use a large screwdriver that fits the screw tightly and tighten it hand tight, new washers (fiber ones don't use o-rings) make sure it won't leak.
  15. merc850

    5.7L MerCruiser Bravo III under water...repairable?

    You could probably find an abandoned boat on dry land at a marina and fix it up; some people walk away from them and you might get it for just paying the storage bill.
  16. merc850

    5.7L MerCruiser Bravo III under water...repairable?

    I don't know what goes on in your area but around here you can't take a boat to the dump you have to pay to have it ground up and disposed of. This costs you money; so if that's the case I'd walk away!
  17. merc850

    Motor and power trim swap on 35hp

    If they're identical just swap powerheads - basically removing nuts and replacing the gasket. Take the bad one off first which will give you the plan. I would do the lower and upper seals before installing the new one.
  18. merc850

    Alpha one, noise from gimbal bearing area, new gimbal bearing, no water intrusion. Stumped!

    How's the drive coupler are the splines dry or did you grease them?
  19. merc850

    1972 Mercury 800 Thunderbolt won't idle below 1500 RPM .... Please Help!!

    After you've tested the compression try setting the low speed needles 1 1/4 turns out from seated then running in the water in forward see if it will idle down. The idle can be set using the cable's brass barrel - remove the throttle cable and push the lever forward to lower the idle then adjust...
  20. merc850

    Mercury 1150 115hp(1977 I believe)

    Here's the plate and Nr. from my 700
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