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    acceptable compression for 1984 Johnson 40 hp

    What would be considered good compression on this motor? Does anyone know the original specs for compression.
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    changing carb jet

    I bought a boat that came from a much lower elevation. Is there a way I can look at the jet and tell what size it is so I know if I need to change it?
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    gear ratio of 1993 froce 70hp

    Can anyone tell me the gear ration of a 1993 70hp motor?
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    prop performance question

    1) Performance issue you are trying to correct. Low RPM at WOT, it is currently running about 4400-4500 rpm 2) Current prop manufacturer, model, aluminum or stainless as a minimum. Solas rubex aluminum 3) Current prop diameter and pitch (required). 11" 15...
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    Year and RPM range for my motor 70HP Force ?

    I have a Force motor with the serial # 0E022160. I would like to confirm what year it was made and I also would like to know what the proper Wide Open RPM is for this motor. thanks
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    at the prop HP rating ?

    Is a 1993 force 70hp motor rated at the prop or the power head ?
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    Fishifnder wattage?

    I am in the market for a new fishfinder. I only fish fresh water mostly 50 ft or shallower maybe once a year fish a lake where I might go as deep as 100ft. My question is will a 2000w fish finder be high enough power for my application. Will it be able to tell the difference between fish and...
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    compression on late 60's 4hp

    what should the compression be on a late 60's 4 hp? How is a good way to check it since when you take the top off the pull rope isn't attached?
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    how to find serial #,,,, is this the number?

    I have an old mercury outboard trolling motor a guy gave me and I am trying to figure out year and HP. I am pretty sure it is a 4 hp. It is a 1 cyl. I can't find a serial number anywhere on the outside. By the spark plug I found this number 1016-2394. On on side where the vacuum hose connects...
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    change from 18p cuped to 19p uncupped?

    18ft aluminum 1973 starcraft, 1998 120hp Force motor WOT rating 4750 to 5250, I currently use a Stainless 18 p prop that is CUPPED. The motor currently runs at 4850 RPM at 32mph. The cavitaion plate on the motor is right at or just a hair below the bottom of the boat. I was thinking of trying an...
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    change of pitch question

    I have a 1973 18' starcraft aluminum boat and a 1998 120hp Force motor. I am currently getting 4800 rpm at WOT and about 31-32mph. I have a stainless 13.25 dia 18 pitch cupped prop. I was thinking of going to a 17 pitch prop and want to know if there is really any advantages in my application to...
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