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.

[msbhammer]

Nice V Pics. Also dig teh webpage.