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    Driveshaft size?

    I have a 1979 7.5 merc. (s/n 5343319). I wanted to be sure I got the right imeller for it. I see there are 2 different sizes of shafts for this hp motor. Any ideas from the S/N what size mine is? I don't own a micrometer.
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    Oily water in lower unit (seal?)

    I took my 7.5 merc. (s/n 5343319) out for the first time after an impeller change. When I started it I noticed no water coming out. (it did work in a garbage can right after new impeller) I dropped the lower unit to see what happened to the water pump and in on top of the pump, shaft, etc. was a...
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    Troll lever

    On my 79 7.5 hp mercury there is a "troll" lever in the transom clamp area. Any clues as to what this does. Kinda looks like it locks the motor from flipping up.
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    Little Carb Leakage

    I have a 1979 Mercury 7.5 HP. I notice it leaks some gas out of the black plastic grate on the front of the carb. Is a little leakage normal or does this mean a float or other problem?
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    Year of Mercury motor

    I was just given a mercury motor with blue decals on it. The S/N is 5343319 and it also says Thunderbolt ignition. I was wondering what year this is and any info on the ignition. Also any info about known issues etc. with this year motor.<br /><br />Thanks
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    Help determining year of crestliner boat.

    I am looking at buying an older 12’ Crestliner aluminum boat. The plate in it says sportsman model, S/N M10277. I was wondering what year this boat is?<br />Also it is on a really old Mastercraft trailer with 8” 2 piece wheels with the hub built into them. Any idea where I could find a spare?<br...
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    Transom height terms

    What do LS and SS mean for a transom height. I am seeing this on Smokeercraft's Alaskan model.<br />Thanks
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    Old SeaKing date

    I am looking at buying an old SeaKing by Wards. I was wondering what the manufacture date is please. Model GG8960A S/N 75X670881. How hard are they to get parts? Also how long do they usually run on that little gas tank built in? Any idea what they are worth? It is attached to a 12' aluminum...
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    Are these the right parts

    For a 2002 Johnson 4 stroke 70HP, does anyone know if the 2" sys check gauge P/N 775810 has a warning horn driver built in? Is warning horn P/N 176360 what I need?
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    System check gauge and warning horn

    For a 2002 Johnson 4 stroke 70HP, does anyone know if the 2" sys check gauge P/N 775810 has a warning horn driver built in? Is warning horn P/N 176360 what I need?
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    Difference in tachometers?

    Is there a difference between a 1991 Johnson tach. and the newer ones? In our conversion from 91 to 02 we are not getting a tach signal. We tapped off of a gray wire in the new harness and ran it to the old tach and nothing happens. Did the older 2 stroke have a more powerful signal than the new...
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    System check buzzer

    We have converted from a 91 2 stroke to a 02 4 stroke using a wiring harness adapter. We purchased a new system check guage and have that working. Off of its harness is a 2 pin connector we purchased a Radio Shack 12v buzzer. (I know should use OEM) when the key is turned on we get a 1/2 second...
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    Wiring harness from 91 Johnson to 02 question.

    We are switching our older 91 Johnson wiring to a 2002 Johnson 4 stroke. Purchased the adapter harness and the system check gauge. After review of Seloc and this site I have determined I think, the purple wire is positive. Is this always the case? The reason I ask is it had a loop solder less...
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    Anyone know weight of 90hp 2 stroke?

    I need some weights to make a comparison to a 4 stroke we just mounted on our boat. The boat is rated at 90hp and we put a 70hp 4stroke on it. I am concerned about the weight of the 4 stroke. Therefore if I know what a 90hp 2 stroke would weigh I would have an idea if we will stay afloat. Thanks
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    Motor weight on boat

    We recently replaced a johnson 60hp 2 stroke with a 70hp 4 Stroke. This motor weighs in at approx 350Lbs. We haven't put it in the water yet. This is on 1991 175 SeaNymph that says it is rated for up to 90Hp (2 stroke I assume). Would there be any problems with the weight of this motor on this boat?
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    Type of oil for 4 stroke

    Is there really any difference between actual outboard synthetic blend and auto synthetic blend? Can you use the auto blend with these motors?
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    How can you tell if a motor was in saltwater

    We recently bought a motor from this site that they “don’t think” was in saltwater. I can’t tell what would be considered excessive corrosion for a 2002. How else could you tell? What would that mean to the life of the motor? What is the life span approx of a 4 stroke motor? They said it has...
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    Adjusting shift cable linkages on 02 johnson 70hp 4 stroke

    We are converting from a Johnson 60 2stroke to a 02 70hp 4stroke. Trying to use the same cables just put on the wiring harness adapter.<br />When setting up the shifting cable linkages, obviously in neutral the prop should spin freely both directions. When in forward both cable linkages move (I...
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    Oil filter for 02 70hp Johnson

    I was wondering if anyone knows what the part # is for the oil filter on a 2002 70hp Johnson outboard 4 stroke? I believe it was actually built by Suzuki for Bombardier. The current one on it is 434-839 but the local dealer says it is a different one. Also do you have to use marine oil or will...
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