1987 Looper v4 140 RPM only 4000

THEFERMANATOR · #1 03-27-2008, 07:18 PM

Most all of the JOHNNY-rudes 2,3,4,6,8 cylinder outboards run on a 12 pole setting, as well as MERCURY V-6's and many others. Is setting 6 for 12 poles? Also what are the numbers stamped on the carbs? I went and checked the catalog and an 87 could have 59D's or 61D's, and if it was a late engine it could have 63D's in it. I know 86 was 61D's which is what my carbs had stock, but 87 was the last small bore and 88 was large bore(displacement, not carbs). It gets confusing with these things sometimes.

nymack66 · #2 03-27-2008, 08:03 PM

Yes the Tach is set to setting or dial 6 which equals to a 12 pole.
I was told my engine is a 1987 E140tlcua, The carbs I remove have 397907 & 397908 is stamped on em, The high speed jets the dude remove is 61d he told and bill me for complete replacements on all carbs , The carbs on the engine has no stamp on em , As for the high speed jets on the engine currently I am not 100 percent sure but I remember him saying 64d or something like that . I will remove and check em tomorrow afternoon . My Idle is all 28 , Intermediate is 16 starboard 20 on the port side as per the manual. What's on yours across the board ?

spareparts · #3 03-27-2008, 08:10 PM

hook a shop tach to it and check it against your tach, what prop are you spinning?

nymack66 · #4 03-27-2008, 08:42 PM

I remove a SS 14x3/8 x 19 only going 3000 to 35000 rpm, I install a 14.8 x 17 aluminum it is a 15 spline prop 3 blade
Remember I am restoring this boat I have no base line to work with , Please see www.nymack66.com for some photo etc , I am stump in regards as to why the engine is not giving me the RPMs everyone is talking about !!

THEFERMANATOR · #5 03-27-2008, 10:26 PM

I would try a 15 pitch stainless wheel myself, but somethin don't sound right here. Are you sure your hitting on all cylinders under load? Is the timing set to 18 BTDC @ 5000 RPM's(very important that it is set at 5K as the power pack has about 4 degrees of advance in it with RPM due to trigger and stator outputs). Loopers are CRITICAL of timing. I would get you a bo0ok and go through the carbs top to bottom, make sure the plastic bodies are not warped. Then set the timing and go from there. To bad you aint closer, I'd help you figure it out as I'm fairly proficient with the V4 90 degree loopers.

nymack66 · #6 03-28-2008, 09:00 AM

Timing and link and sync was done by local dealer Boat Tune. I can only assumed it was done correctly
Carbs re-built inside out
Carburetor 397907 & 397908
Idle Air Bleed #28
High Speed #61D (I am not sure what he replace this jet with )
Intermediate #16

THEFERMANATOR · #7 03-28-2008, 11:02 AM

Those sound like the early 87 same as 86 carbs. These are the ones I am running. I'm jetted with 63D's main, 14's intermediate, and 34's(or 36's not 100% certain on which) for idle. This works excellent in mine running 50%1 pre-mix with PENNZOIL synthetic blend oil. But I have some very mild porting done in the exhaust ports behind the sleeves, and my air box has been slightly ported as well and I have a .020 over bore. I still trhink there is a problem with your link and sync or in the timing department. These engines are CRITICAL of timing. 2 degrees to much and meltdown happens, 2 degrees not enough and your 140 is a 115. THEY HAVE TO BE DEAD ON! I learned this one the hard way

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Skools Out · #8 03-31-2008, 03:40 PM

i just looked at your pics that's a V6 lower unit for sure. i just looked at all 3 of mine none that same case. but yes same case on my many v6 225's

nymack66 · #9 03-31-2008, 03:46 PM

Thanks a million for all your help I will follow your instructions and post the results . Question I have a 13 spline 1978 140 v4 lower unit as a spare . Will this work ? I am guessing I will install a new water pump kit change the oil and bolt it up ? The current unit will not be a problem since I had it remove and service last July ..

Skools Out · #10 03-31-2008, 06:09 PM

the 78 will fit but you will have to swap the shift rods as the older one was off a cross flow and newer motor a looper they just use a different shaped shift rod that's all. they just screw in and out.

Now on a 20" lower unit the shift rod when you swap should measure 21 & 15/16 inches measuring from the surface where the gear case and midsection meet to the top of the shift rod when the gear case is in neutral.