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    Thermostat Problems

    I’m having problems getting the right thermostat parts for a 1987 Johnson 70hp, or at least getting them to fit right. I notice that iboats and many other internet parts places do not carry parts for this year model. My local OMC shop sells me P/N 434137 ($29.50!) which doesn’t look much like...
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    1980 Johnson 70hp

    The engine in the photo is a 1980 Johnson 70hp that came off a 17’ Boston Whaler. It was pretty ugly when I picked it up a couple of weeks ago but the compression checked out at about 110 psi in all 3 and aside from the rust and carbon (lots of carbon) it does not appear to have any obvious...
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    Another trim unit question.

    Are 3cylinder and V-4 trim units interchangeable? I’ve been looking on ebay for a tilt/trim unit for a 1980 70hp Johnson. Some sellers claim that their units off a V-4 will fit, others say it won’t. Both the 3 cyl & V-4 units appear to attach with 6 bolts, what’s the difference in them?
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    Engine Cover Gasket

    My latest project is a 1980 Johnson 70hp cast off from friend with a new boat show special 4-stroke Honda. Cosmetically it’s pretty beat. I got the engine cover cleaned up but it needs a new gasket. Does anyone know where I can find the gasket material?
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    1988 100hp

    I’m considering buying a 1988 Mercury 100hp (4 cylinder). It appears to be in good shape, has good compression, runs wells, shifts smooth, T/T works well. But I have no experience with this engine. Does anyone have any pros or cons to share on this or similar engines?
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    Horsepower rating for older boats?

    I have a 1980 16’ Hewescraft River Runner that I’m looking to re-power. It is rated for 80hp but as I understand it hp rating in 1980 were at the engine, today they are at the prop. Do I have to reduce the 1980 rating by some factor?
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    Kill Switch

    My control box has the spring loaded button emergency ignition cut-off switch with the rubber suction cup like lanyard connection that is supposed to hold the button down. The rubber keeps popping off and killing the engine, most annoying. I ended up running back to the launch today with one...
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    Plugs & smell

    1987 Johnson 70hp – This engine had NGK-BR9HS-10-00 installed when I bought it a couple of months ago, they are gapped to .040 and all three have a toasty brown look to them and all seems well. Of course they are not the recommended plugs for this engine. The owner’s manual recommends Champion...
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    VRO – temporary disconnect?

    I have a 1987 Johnson 70hp VRO that is in new condition and I am installing it temporary on a boat while I’m fixing the boat’s original engine. The problem is there is really no place to put the oil tank on this boat. Will it hurt the VRO pump to disconnect and plug the oil line? I know that...
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    Run as is?

    I took my 1985 115hp merc into repair shop for diagnosis. It is hard to start first thing in the morning but after that it starts OK and after starting it runs just fine. The diagnosis came in with low compression in one cylinder (120 in all but #5 which is 60) and no spark to #4. The bottom...
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    Jet Drives

    I just picked a very nice 1981 70hp Evinrude which I plan on installing on a 16’ LOWE for use in the rivers here in WA. Of course a real riverboat here needs a jet drive. I’ve never owned a jet drive but from what I’ve seen they look like they just go on in place of the lower unit. How easy...
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    Propeller Identification

    Does anyone know what engine this prop fits? Seller says it might be off an 85hp evinrude but it has 15 spines. I thought OMC props have 13 and Mercs have 15??<br /><br /> http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=2486015858&rd=1&sspagename=STRK%3AMEWA%3AIT
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    Hosed up idle air settings

    I think I’ve screwed this up big time. My 1985 – 115hp inline 6 started dieing on me at idle. Very annoying around the docks; so I tried adjusting the idle air screws on the carbs. It idles better now (not great) but it won’t accelerate, bogs down when I advance the throttle. If I baby it...
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    Water Pressure

    What should the water pressure readings be for a 1985 Mercury 115hp?<br /><br />I get no reading at idle climbing to about 13 psi at WOT. I think maybe the line or the gauge froze this winter and are acting up.
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    Carb Kit

    My local Suzuki dealer/service center tells me that Suzuki does not offer carburetor rebuild kits. Instead I have to order the individual parts. I suppose I could make a list from the manual diagrams but what I really want is a kit with everything in it. I don't want to have run across town...
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    Black ooze

    I have a recurring problem with a 1991 Mariner 8hp 2 cycle motor. There are two holes on the back of the mid section under the power head. The hole on the starboard side is about ¼ to 3/8 in diameter, the hole on the port side is smaller, maybe 1/16 in. A nasty secretion of black ooze runs...
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    Shaft Lengths

    After talking to my local Merc dealer and looking at the iboats motors for sale I'm really confused on shaft lengths. My dealer tells me that motors come in 3 sizes - short shaft i.e. 15" - long shaft 20" and extra long shaft 25". All measured from the underside of the mounting bracket (where...
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    Tilt Interference

    I've got a 1985 Merc 115 on a 17' Arima Sea Chaser. This engine is so tall it hits the forward edge of the splash well when tilted up. This prevents the engine from tilting up enough to engage the tilt lock so the weight of the engine is supported only by the tilt cylinder when trailering. I...
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    T/T - Motor Questions.

    I recently noticed that my tilt/trim motor is badly corroded. All the paint is gone from the body of the motor and instead of black it is a solid rust brown color with bits of rust flaking off. From the description and diagrams in my manual I can't tell if the motor and the pump are a single...
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    1985 Mercury 115hp questions

    I just purchased a 1985 Mercury 115hp, inline 6. Can anyone tell me recommended WOT rpm and the gear ratio?<br /><br />Thanks
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