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  1. R

    Johnson 90 ELUA 1997 water pump

    How old was the old impeller ? ----Did vanes have a " set " on them and were they curved ?
  2. R

    Johnson 90 ELUA 1997 water pump

    Agreed it takes a lot more effort with a new impeller.----Did you use factory parts or something else ?
  3. R

    Lowest compression you’d buy

    Depends on how you want it to run !-----Had a 30 Johnson here a few years ago.------Showed owner the scored piston.-----Did not want it fixed.-----Had no idea how serious it was.-----Says his motor runs great.-----Most folks think that if a motor " can run " there cannot be anything wrong with it !!
  4. R

    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    Measured a brand new piston for a Mercury.-----It has 0.008" taper.------If a piston is way too loose in the bore than crankcase compression can be lost right out the exhaust ports.-----Fitting new piston rings in old worn out grooves is a mistake as well.----This whole concept of a 2 stroke...
  5. R

    Force 70 HP - Full throttle in reverse but underpowered in forward

    Sounds like the motor is running on 2 of 3 cylinders.------Sounds great on a hose to the untrained ear.-----Will rev up running on 2 of 3 cylinders.-----Step #1 is compression test.---Post the numbers.-----Then check for strong spark on the 3 leads.----Must jump a gap of 5/16" or more.-----Revs...
  6. R

    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    New piston might be 3.365 /3.367 " at the rings.-----3.372"at the skirt.-----Aluminum pistons expand at around 0.000012"/ inch / degree F ------New pistons are tapered and sized with clearance when cold.------When engines run clearances change.
  7. R

    40hp shearing flywheel keys?

    Do not use loctite on the tapers.----Often the hardware store key sticks out too much.----Then the flywheel cannot be pushed down on the tapers.----Remember , the key locates the flywheel for timing.----The locking tapers drive the flywheel.----The locking tapers eliminate any motion between...
  8. R

    How to take out rounded drain plug on force 85? Is there a way to drain without taking it out? Like pumping out the fluid maybe?

    I do not like those.----But use a pointy punch and hammer and you can get it to turn.
  9. R

    Yamaha 25hp outboard

    Hard to comprehend 4 1/2 hrs to clear a tell tale.-----Sounds like a tall tale to me.
  10. R

    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    Well----In post #1 you state that you " have the tools and the know how " -----I believe you need to study some more ---Sorry.
  11. R

    1972 Evinrude 50hp selectric

    If I picked up a 1972 outboard motor for cheap ??----I would tear it down and do a complete evaluation before spending any beer tokens for parts.----First post the actual compression values here.-------Is your battery top notch / load tested?----Is the starter in top condition ??----Does the...
  12. R

    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    Well---3.375 " is the BORE size and a new PISTON might measure 3.365" near the ring lands.-----I think I am going to step aside here.----This is going nowhere.
  13. R

    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    Measure the #2 piston near the piston rings.----Will likely be around 3.365"------A standard piston in #2 will not last long !!!----Just will not run properly.----Find a good used block on E-bay ????
  14. R

    1990 Force 120HP #2 Cyl zero compression and upon opening piston shows damage

    There is no way you can run a standard piston in #2 cylinder.----Needs to be bored and an O/S piston / rings fitted.
  15. R

    1972 Evinrude 50hp selectric

    Disconnect black wire with yellow stripe at the CDI / powerpack.----Test for spark.
  16. R

    1980 15hp Sea King by Chrysler Carb float needle and seat

    That needle and seat was also used on Tecumseh snowblower engines.---Did mine last fall.
  17. R

    Yamaha 25hp outboard

    They plug with weeds and dirt.----Clean the hose and fitting.
  18. R

    1973 65hp starting question

    Compression at 110 PSI is considered low.----Perhaps test with another gauge.
  19. R

    1973 65hp starting question

    It is NOT really automatic !!-----When it left the factory the choke would come on part way when key was turned on.----Operator still had to understand that toggle switch was to be operated for full choke.----When motor warmed the " automatic " part would kick off.----Since we cannot see your 50...
  20. R

    1973 65hp starting question

    Need to find the wire in that control to operate the electric choke.----Used controls with the red plug are quite plentiful.------After you evaluate this motor , compression test.-----Install a new water pump impeller.----If motor is a keeper , look for a control box.
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