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  1. R

    Stuck water impeller stuck

    It is jammed on the plastic wedge perhaps.----Use a wood dowel and hammer and see if you can bump it in both direction to loosen it.
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    Small oil leak?

    These are cavity drains.-----Drain the water so no frosty damage occurs in cold climates.-----Any water in the gear oil you drained ?-----Or a 1987 lower unit should be pressure tested.------On a 33 year old motor a seal kit should be installed if seals are original.---Cheaper than gears and...
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    Mercury 90 hp

    Overheating ?-----Water in fuel ?-----Plugged fuel filters.----Air leak in fuel line / connectors ?------Check spark.----Perhaps post compression numbers.
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    Mercury 90 hp

    What year ?----Serial # ?----3 cylinder or inline 6 cylinder ?
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    94 Johnson Slow Cold Start Issue With Video

    Key should be pushed in while cranking on cold start.------No it should not increase in revs up like that on start-up.----I would take the head off for a look see inside the motor.-----In the big picture a head gasket is cheap.
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    1964 Speeditwin 28hp / WOT RPM - Prop sizing

    kdiddle------Please be more thorough in your research.-----The 28 in that 15-28 is a totally different motor than the 28 HP that you have.----Hurry and visit a boat shop for some help.----The internet searches are failing you !
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    1964 Speeditwin 28hp / WOT RPM - Prop sizing

    The prop that shows up ( picture ) on this website is a through hub exhaust.----Not a pin drive either.-----There is no way you should be putting a 9" diameter prop on this motor.-----Hurry find a boat shop for some old time factual help.
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    1964 Speeditwin 28hp / WOT RPM - Prop sizing

    Don't buy a prop for your motor through this website.-----The listing for 40 HP 1960 to 1976 shows totally wrong prop !!!----40 uses same prop as the 28 HP.
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    94 Johnson Slow Cold Start Issue With Video

    My mistake I thought motor had stalled.-----Post the results of a compression test.
  10. R

    Stuck lower unit

    What we tried to explain in post #2 and 4 and a few others too !!
  11. R

    Mercury 500 50hp - year unknown, have questions

    You found the serial # on that plate.---And the decals also indicate it to be a 78 model.
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    94 Johnson Slow Cold Start Issue With Video

    You should not be shifting it into forward with motor NOT RUNNING.------Post video with cowling off.-----What fuel pump is on this motor ?
  13. R

    1986 Johnson 25 hp no discharge water

    There is a wonderful opportunity to learn how the cooling system works.-----If you are willing to ;earn.
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    1986 Johnson 25 hp no discharge water

    You need to learn that the water from the tell tale does not even circulate through the block or the thermostat !!----It tells you that the water pump is working.----It does NOT INDICATE that motor is cooling properly.
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    1986 Johnson 25 hp no discharge water

    The tell tale should show water right after start-up.----Thermostat is not involved with tell tale.----Tell tale is plugged.----Or not enough water in your test bucket.----Or needs new impeller if it has not been done for 5 years.
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    Gear oil change ?

    Older plugs used the nylon washer.----Newer plugs used the o-ring.----The o-ring can be discarded and the washer used on newer plugs as well.
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    1964 Speeditwin 28hp / WOT RPM - Prop sizing

    If it runs at 8400 RPM it should be revered / donated to a university for scientific research.----It be one of a kind.
  18. R

    1964 Speeditwin 28hp / WOT RPM - Prop sizing

    Many people use a ---smart phone------ and reflective tape to measure RPM of almost anything that rotates.
  19. R

    1964 Speeditwin 28hp / WOT RPM - Prop sizing

    Boat should run about 30 mph with 1 person and 11" pitch.
  20. R

    1964 Speeditwin 28hp / WOT RPM - Prop sizing

    Correct-----Motor should be screaming with 7" pitch prop.----Post pictures of this boat.----I say put a 10 or 11" pitch on it.
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