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    Outboard on stand

    Is there a way to test run an outboard(81 inline six merc)on a stand without a harness? Thanks Timb
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    Merc tach

    Hi,I just put a newly rebuilt motor on my boat,but when I ran it(after the recommended break in) and tried full throttle the tach would read up to 8000.The motor Itook off was a 81 90hp inline merc,I put on a 86 115 inline merc.The boat speed was good (45 on a 17'mako) and the motor sounded...
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    Motor length

    How do you measure a transom to determine if you need a 20" or 25" shaft?Thanks,Timb
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    Prop smash

    Hi,I smashed my prop into a rock (in reverse!) I changed the prop but the motor is running badly even in the yard.Every thing looks ok,compression good.Could it be a bent drive shaft?Is there any reason I can't remove the lower unit and run it (other than over heating)to test the...
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    merc prop

    Hi,I have a 81 inline six 90 hp merc. The prop is 13x19 The rpms tops out at 5400,the book says 5000 should be max. Would it be better to up the pitch or stay off the thottle a little? Thanks,Timb
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    Stuck prop

    Hi, I have a 90 hp Merc that was in salt water a while before I got it. I can't seem to get the prop off due to corrosion. I have tried penetrating oil and a rubber hammer but no luck. Could I use a propane torch to heat the prop? Any ideas would be appreciated(except a hacksaw)! Thanks,Timb
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    Merc hp

    Hi,can someone tell me what year Mercury changed the way they rated HP. I have a 1981 90hp inline 6. Is it really a 115 ?(compared to later models) Thanks for any help,Timb
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    Merc inline 6 carb jet

    Hi,I have a 1980 inline 6 merc 90 hp. I recently rebuilt the carbs and installed new jets.I used what the manual called for (.070 for main jet at sea level)I then heard that increasing jet size is common in old mercs to keep from burning a piston.Any thoughts on this? should Ileave alone or open...
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    Switched switchboxes

    HI, I have a 1980 inline six merc that has two boxes,one is made by CDI ,to replace the other do I need to stay with CDI or can I mix Seirra or merc? :confused: Thanks,T
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    merc switchbox

    Has anyone had a switchbox on an older merc cut out intermitantly? I have an inline merc with two boxes
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    Merc tach

    I recently purchased a used Faria tachometer to hook to an old merc inline 6 (no distributer). Does anyone know what to set the adjustable dial on? It adjustable from 1 to 6. Thanks
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    Stator check?

    Hi,I am trying to check a stator on a 1980 inline 90 merc. I checked with a voltmeter while running, and the low speed checked good and the high speed was in in spec except polarity was reversed. Does anyone know if this is right or how to correct? Motor runs good until it gets on plane then...
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    Stator check?

    Is there a way to check a 1980 90hp merc inline 6 stator other than an ohmeter? Would it have high and low speed coils in it? Thanks for any info.
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    90 inline merc problem

    Hi, I have aquired a 1980 90 hp inline 6 merc,can't get it to run in gear at high speed. starts good ,idles great, but when it starts to plane out it surges. I've been thru the fuel system but a mechanic told me it may be the high speed part of the stator. My book doesn't cover anything except...
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    1980 90hp merc inline 6

    Hi, I have a merc that won't get up on plane.Starts fine,runs good until boat gets up to planing speed then cuts down to idle on and off.the more throttle the more it cuts out.I have replaced the fuel pump,changed tanks,checked timing,adjusted idle mix,tested trigger,even kicked it! :mad...
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