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  1. merc850

    2001 Mercury 90hp 2 stroke wont start / idle

    Don't use starter fluid in that motor, use gas at 50:1 oil mix; replace the fuel pump diaphragm for your first fix. Are you pumping the fuel bulb to prime the carbs?
  2. merc850

    1974 850 mercury tilt cylinder leaking,

    If you can find the parts here are some instructions
  3. merc850

    Mercury sportjet 175 xr2 rectifier problem

    Connecting the battery backwards for just a second will also fry them. The marine batteries I've had came with wing nuts (?) to attach the cables - I replace them with SS Nylock nuts that don't come loose or corrode.
  4. merc850

    Mercury sportjet 175 xr2 rectifier problem

    Boosting a low or dead battery, bad grounds in motor, using a deep-cycle battery.
  5. merc850

    Rewinding a stator (398-4793)

    What is the year/serial Nr. of this motor? If it's the encapsulated type it's going to be hard to give the number of turns without destroying it, might as well use a good one.
  6. merc850

    Mercury xr2 150 Voltage Regulator / Rectifier Wiring Questions

    When the motor is running @ 4000rpms you should be getting around 13.5v this is how you check its operation, I don't know anything about the CDI unit the one in the schematic is a Mercury part /old/ Nr. 88825A7 have you looked on the CDI site to identify those components?
  7. merc850

    Mercury xr2 150 Voltage Regulator / Rectifier Wiring Questions

    This worked for me on a 1975 850. Make sure it's bolted to a metal surface.
  8. merc850

    Alpha One Gen 2 Clunk into Gear

    [Q] Doesn't the shift linkage have an interrupter switch that momentarily shorts the ignition to make shifting easier? Right now the prop is freewheeling back and forth but when it's in water there will be a dampening effect from drag and it will not be as "clunky", the water will also make it...
  9. merc850

    1971 135 hp inline 6 Mercury lower unit trouble

    It could be the upper shift shaft (in the driveshaft housing) is is corroded and bends while shifting (happened to me); maybe someone was shifting it into reverse while the engine wasn't running and twisted the shiftshaft internally or..the reverse lock cam is out of phase....the reverse lock...
  10. merc850

    Regular maintenance - change just the impeller or entire housing too?

    Use dish soap it washes out of the pump, grease can be absorbed by the rubber; who knows what effect it has.
  11. merc850

    stuck in neutral on 90hp due to shifter on console

    I think one is the throttle detent ball screw if you turn it in it makes it harder to shift out of neutral, the other one decreases or increases the throttle resistance.
  12. merc850

    Merc Thunderbolt manual needed

    There were a lot of Merc 500's produced - you need to post the serial Nr.or a picture of the motor cowling. The "Thunderbolt" was produced in the early 1950's
  13. merc850

    stuck in neutral on 90hp due to shifter on console

    Those set screws are.........
  14. merc850

    Old merc outboard details?

    You need a tachometer to establish your rpm such as this one sold on this site 32905 - 4" Tachometer 7000 RPM's for gas Outboard engines. Perimeter-lighted white dial with bold black graphics black aluminum bezel and flat glass lens. All it has to be is alternator signalled. Sometimes a dealer...
  15. merc850

    1986 Mercury 90hp inline 6 carburetors spitting gas

    Here's the float setting, check them first to see if they're "fuel logged" - the hole that the fuel's spraying out of is the back drag vent.What is that hose that's hanging loose, for? There are also filters in the tops of the carbs; I had them in my engine and threw them away!
  16. merc850

    1969 Merc 110 Fuel Line Assembly

    From the same company, you should replace the diaphragm too.
  17. merc850

    Mystery part on drive shaft

    Grease the splines at least once a season before you spring launch.
  18. merc850

    1969 Merc 110 Fuel Line Assembly

    Cut off the connectors and replace them with these from oldmercs.com
  19. merc850

    1996 Mercury 125 - no reverse

    Do not shift into reverse without the engine running or someone turning the prop.
  20. merc850

    Prop size stamp?

    It looks to me like the exhaust gases will exit around the blades instead of thru the hub.
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