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    stuck carb

    Bottom carb on 125hp 1969 in-line 6 is stuck closed. (no wonder I wasn't getting enough speed). I have tried sprying it with WD40 but it hasn't loosened it up any. Is there any way to loosen these babies up without taking the carb off and pulling it apart?
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    Gearbox Serial Number

    Found a gearbox on ebay that is supposedly for 6 cyl incline. Part number is quoted as 1655-7332. Anyone know the year and model or where to look it up?<br />I need it to fit onto a 1969 125hp in-line 6. The big question is will it fit....???
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    timing - max advance, exhaust tube

    I've run the new powwerhead in gently on a 1969 125hp in-line 6. Now it's time to set up the timing correctly. <br /><br />Clams and many others have stressed that in-line 6's should have maximum advance of 21degrees. The front of this motor states 35 degrees advance!! And the timing marks on...
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    Gear Box Interchangeable....?

    Hi All. My 1969 merc 125hp straight six has chewed it's gearbox. I saved my gearbox from my old 1976 115hp straight six and tried to fit it.<br /><br />I ground the small locating pin to the rear of the gearbox off so it would fit up but it doesn't seem to quite match up at the front. When I do...
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    Water pressure rebuilt engine on muffs

    Hi All,<br />After grenading my 115hp in-line 6 I puchased a 1969 125hp in-line 6 that has been completely rebuilt. New powerhead, waterpump, carbs, fuel pumps etc.<br /><br />Started the motor tonight with the hose and muffs on (and it started first go!!) but no water pressure on my gauge or...
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    Compression on used motor

    Hi all,<br />Threw a rod on my 70's 115hp in-line 6 :-( so been looking around for a used motor. Have found an early 80's 150hp in-line 6. Can probably get it for $500-$700AUS ($400-$650US)<br /><br />It's been sitting for a little while but looks in reasonable shape. A quick compression test...
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    115hp in-line 6 might have bitten the dust

    Ihave a 1976 115hp in-line 6 and have done quite a bit of work on it over the last few months..(impeller, carbs, plugs, rotor cap etc). Took it out today and it took about half hour to get started....you know, practically flood the thing, hold choke in and hope.<br /><br />Well it ran well for a...
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    Stalling wth engine cowling on

    Interesting one this....<br />I have a 115hp inline 6 (1976) and have done the carbs, new dizzy cap and plugs, fuel system etc.<br /><br />I tuned the idle jets so that the motor finally goes from neutral into gear and doesn't stall.<br /><br />Install the cowling and she stalls when going from...
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    Prop discussion

    I have a 1976 115hp straight six Mercury outboard. The prop is a bronze 3 blade unit - only identification on it is a "21" stamped into it. I assume then that this prop has been modified to be a 21 pitch prop. It's got some serious cupping on it too. (ps the boat is a 14ft Pride Cheetah and is...
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    Mystery hose on 1150 merc

    Whilst rebuilding the carbs today on my 1976 1150 115hp in-line 6 merc (distributor type) I noticed a thin plastic hose that runs down the starboard side of the engine. This runs from the top to the bottom of the powerhead. Does anyone know what this baby does?<br /><br />Of course it has...
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    Testing tachometer Pulse

    I have a 1976 Mercury in-line 6 outboard 115hp and a 7,000 rpm VDO tachometer.<br />The tachometer is not working and I need info on how to test the tachometer and the pulse going to it.<br />The tachometer is wired to the throttle hand piece with three wires :+12v, Earth and pulse. <br /><br...
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    Mercury 115hp stalls-in gear

    Have a 1976 Mercury 115hp outboard - the in-line 6 with thunderbolt ignition.<br />Motor starts fine and revs fine in neutral.<br />When put in gear it stalls. Occasionally I manage to get it in gear without stalling and it gradually picks up revs and then runs fine. Back into neutral and it...
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