1987 Looper v4 140 RPM only 4000

[nymack66]

Guys , Any idea why I can only get 4000 RPM at WOT ? Compression is 130/120 across all ports,
What size Jets do I need to install on my Carbs ? Currently 58D installed.
New everything on the engine,coils,plugs,wires,harness you name it minus pistion and rings !! . See photo at www.nymack66.com , I am restoring this baby..If I can get an album here it will be great I will move my pictures up

[THEFERMANATOR]

58D is for a 120HP, not a 140HP. Should have 61Ds in it. How many screws do you have holding the throttle blade onto the shaft? Somebody may have put 120 carbs on it, or a 140 cowling. And 4000 is no where near enough, i turn mine right up to 6100(rev limiter for 85, 86+ is 6700). These loopers need to turn at least 5600 WOT. Are you sure your tach is right?

[nymack66]

Good question on the Tach , New Tach what setting do i turn it to on the V4 ?

[THEFERMANATOR]

12 pole IIRC. Are you sure that it is a 140 and not a 120? What is the number on the block welch plug?

[nymack66]

It is a 140 for sure base on the power Pack etc
The gauge is Teleflex Vector 7000 RPM Tachometer
For 4, 6, or 8 cylinder gas engines
or 4, 6, 8, 10 or 12 pole outboard engine

[THEFERMANATOR]

Set it to 12 pole. And the 120 and 140 are almost identical, the only differences are the exhaust tuner, carbs and reeds. Power packs and everything else is the same, even the timing. The only differences cannot be seen without some disassembly.

[nymack66]

Just verify the setting on the Tach it is a Telflex Brand and it is set to 6 which per the instructions is for and outboard 2 stroke v4 engine, As for the High Speed Jets they are 64D. Is this an issue with low RPM 4000 max at wot ? I have spare jets I can swap back to 61d please let me know

[THEFERMANATOR]

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]

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]

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