Recent content by rdeyoe

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    Johnson 140 carb jets

    I have a 1981 Johnson 140 cross flow that has three pistons at .040" oversize, one at .064" oversize (lots more information here: http://forums.iboats.com/showthread.php?t=519282 ). All the high speed jets are factory (67C jets). I'm considering changing for larger sizes, after reading many...
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    Burning piston on cylinder 4

    Re: Burning piston on cylinder 4 Evenin' gentlemen. Got the "redneck pressure" test done. Cylinders were dry, and ports too. There was a good drip at the exhaust manifold into the midsection junction area. Tried to get some pics of it, but kind of hard in that area. Got the heads and...
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    Burning piston on cylinder 4

    Re: Burning piston on cylinder 4 @boobie: I didn't get the chance to check the WOT timing. It may have been too advanced...will definately be taking a look at that first WOT I get to do. @Haffiman: The rebuild was because rings in three cyls let go (pin migration in pistons). I can't see...
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    Burning piston on cylinder 4

    Got a 1981 v4 Johnson 140, just rebuilt (all the necessary info here: http://forums.iboats.com/showthread.php?t=511125). Took her out for the some more break-in (two hours of up-and-down on the throttle...just a couple or runs at open throttle), after much checking in our test tank at home...
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    Carb link and sync, strange device?

    Have a 1981 crossflow 140HP Johnson. Did the link and sync per the OEM service manual. All seems ok there. But, there's another linkage going up to what looks like some sort of potentiometer mounted at the top of the carbs. It has electrical leads going in, and what looks to be a slotted...
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    Heat difference in heads

    Particulars: 1981 J140TLCIM, just completed new pistons (.040 over on 1,3,4....064 on 2), new rings and gaskets. Took her out to the river today to do initial break in. Started after a quick backfire. Got her to idle at 1500 for warm up. Checked temp on heads with IR thermometer. Port side...
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    Carb jetting on rebuild

    I have a 1981 Johnson 140 HP that I've just had bored out .040" (cyls 1,3,4) and .064" (cyl 2). The block was already machined out .030 before I lost some rings, that's why the large sizes. Cylinder 2 had a piston dowel migration that scratched that one too far for .040, so my machinist took...
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    Johnson 140 compression

    Ok, got a small question. First the history: Motor is a 1981 Johnson 140 hp. Bought the motor last season on a 19' deck boat. Checked compression when I bought it. Had about 110-120 across all four cylinders. Motor ran great all season, with the exception of cold starts and such. Changed...
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    '81 Johnson 140 V4 Lower Unit Rebuild

    Ok. Just some mech questions for the group. Enlighten me please: 1981 Johnson 140 HP. Took the kids tubin and heard this ratcheting sound from the motor....then thump! No forward gear (lots of thunking around). Reverse worked fine and got us back to the dock (should seen the look on the...
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