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125hp mercury 2+2

Randy Fleming

New member
Have replaced stator power pack rectifier accelerator pump both popit valves new filters all fuel hose new kits in carbs new plugs

We cannot get it to run under load on the water 4200 rpm max it falls on its face after coming out of hole Im thinking the guy I purchased it from
has maybe changed carbs and dont have the right jets for this motor motor has perfect compression Help appreciated Thanks Randy
 
How about just over propped? How big is your boat and what pitch are you running? This engine runs at 4850-5250 rpms at full throttle.
 
You didn't mention the fuel pump. What is the condition of the bulb when having the problem. What happens if you are having the problem and squeeze the bulb a few times".

Per Fitz's question, how about some numbers, pictures, how do you handle the trim positioning on the hole shot and once on plane? 4200 ought to put you up in the 30 mph range, maybe more. Proper trim could bring both RPM and speed up to something higher.......
 
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