a friend of mine has a Johnson 140hp
model is 140ml77s

he /we would like to know what can be done to this engine to increase its power, and just howm uch power can these engines realy get to.

we know that in 1977 the hp rating was at flywheel and is roughly 115hp to 125hp at the prop nowdays.

ive heard of many of these engines getting huge speeds and power gains, but never knew exactly what can be done with one of these engines.
before anyone says get a looper, a new engine is not going to happen, he would prefer to boost this one up, especially if he decides to completely rebuild it next year.

so any info on this would be good, and ill pass it on.

from what I gather these were 99 cu in motors !!!!! (could be wrong).


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