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    1993 Evinrude Intruder 175 Rattle

    I do not believe those gearcases with the 2 screws / tabs are as durable as earlier designs.-----Agreed , check the gear oil first.-----If oil is good then remove the cylinder head.
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    Engine options

    Fuel consumption on a 2 stroke can be confusing.----The little bit of testing I did suggested 3500 / 3600 RPM was most economical on the boat I had.----Light weight 16' fiberglass ski boat with 100 HP V-4.
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    Johnson 175 bad compression

    What did you find ?----Pictures.
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    Foot oil leaking

    I doubt that 305123 is leaking.------Pressure test the gearcase to find leaks if there are any.----Very important to maintain the lower unit as parts / service are expensive !!
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    1990 Mercury 40 hp, four cylinder_piston replacement question

    Yes,-----I think that has been done more than once before.
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    OMC Manuals

    Your location ?---What HP engine do you have ?
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    Hydrofoil or Trim Tabs??

    If it has a 21 " or 23 " pitch prop on it now it needs a 17" pitch.------You are so right about the grandpa / grandson comparison.-----
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    Hydrofoil or Trim Tabs??

    The performance is so bad that it almost sounds like the trailer is still strapped under this boat.-----Sorry I have seen the cartoons.------Something is seriously wrong with this boat or motor !----Hurry to a friendly boat shop / dealer.
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    Hydrofoil or Trim Tabs??

    Well-----Sounds to me that dealer never set it up correctly.------I remember boating years ago------17' deep V hull with 100 HP 1966 Johnson.-----3 people in the boat.-----2 people on slalom skis and that boat would pull them up and out of the water.-----Go at 30 MPH with the 2 skiers...
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    Engine options

    Simply amazing.-----I recall the owner of a 100 HP motor saying-----" This 1966 model100 HP is pretty good on fuel compared to the 59 model 35 HP we had "--------Bigger boat , more people , more skiers.-------He also said " I did not buy this boat to save money "
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    Losing a cylinder

    ???----A 1978 model 35 HP would only have 1 carburetor.
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    6hp Mercury - Model #?

    Those decals were used in the 92 to 95 model years I think.
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    Kiekhaefer chevy old school distributors/magneto

    I think they stopped using the Kiekhaefer logo in and around 1970
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    Mariner 2HP Gas Tank

    Have seen these PLASTIC , junk tanks cracked.----Sad that replacement plastic parts are not available.-----A problem today and an even bigger issue in the future for those that will be running gasoline powered outboards.----Perhaps E-bay has a listing for one.
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    Hydrofoil or Trim Tabs??

    You either have the wrong prop or there is something wrong with the motor.----Or there is something wrong with the boat !!----Or too high a pitch on the prop.-----Note----By going to a lower pitch prop you will NOT LOSE TOP END SPEED , do some prop research here.
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    Mercury 2+2 introduced?

    They marketed the 4 cylinder 2+2 for quite a few years.-------If there was something wrong it would have had a 2 or 3 year production run.-----But the selling / installing dealer needs to be aware of this motor.-----Perhaps not the correct motor for say a pontoon boat where owner might select...
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    Hydrofoil or Trim Tabs??

    Your local boat shop can assist you.----Stop running this motor until you find out what is wrong.
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    Hydrofoil or Trim Tabs??

    No way that this boat needs trim tabs !!!
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    1956 Johnson 10 HP QD-17

    Well-----Nature does this.-----The spline in the crankshaft is carbon steel.-----Oxygen from atmosphere JOINS with the steel and forms RUST ( iron oxide ) or Feo3 I think.-----So over time this adds material ( oxygen ) and jams it up one molecule at a time.
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    Hydrofoil or Trim Tabs??

    Find out what is wrong with the boat set up or the motor.-----That boat with a 115 HP motor should take off like a rocket and go 40 miles / hour.
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