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MERC 150 V6

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whip1

Member
MY MERC AT W.O.T. WILL ONLY GO

MY MERC AT W.O.T. WILL ONLY GO TO 4200 RPM.
IS THIS RIGHT ALSO IT HAS NO POWER OUT OF THE HOLE ONCE PLANNED IT RUNS FINE. IT IS ON A 19.5FT FOUR WINNS BOAT HORIZION 190.ALSO THE SPEEDOMETER DOES NOT WORK.I REPLACED THE HOSE AND UNIT ON THE BOAT.ANY SUGGESTIONS.ALSO WHAT
IS MY ESTIMATED SPEED AT 3500 RPM ON CALM WATER.BALLPARK IS CLOSE ENOUGH.
THANKS
BILL
 
"Bill, your model or year of t

"Bill, your model or year of the motor would have helped.

However, most 150 Merc's WOT range is somewhere in the range of 4800 - 5800 give or take a couple hundred, depending on the exact model.

So yours is even falling short of the low end.

Before I would go blaming the motor though, I am wondering if perhaps you are severely over-propped for the current set-up you are running...

An incorrect pitch will give you a bad hole shot and rob rpms from your top end...."
 
In simple terms a V-6 outboard

In simple terms a V-6 outboard is really 6 seperate engines with a common block and crankshaft.You need to do a compression check. You need to determine that you indeed have spark at each cylinder and that each carburetor is actually in good ( clean ) condition.Further running in its present condition may result in serious engine damage
 
Check your spark plugs and wir

Check your spark plugs and wires. I had the same problem last week. I had accidentally loosened a spark plug lead while putting the cowling back on.
 
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