mercury outboard won't go full speed - then goes fast, then slow...
 

Sorry for the rookie question. Any help is appreciated.

I have a Mercury 25Hp on my pontoon boat. Recently, when first
starting out I can push it full throttle and it will only go about 1/4
of the speed it usually does. After a while it will then go full
speed for about 20 seconds then back down to 1/4 speed. All this
while the throttle is pushed all the way up.

I switched fuel tanks to no avail.

Again, thanks for any help in advance.

jason

mercury outboard won't go full speed - then goes fast, then slow...
 

Try the easiest things, Change spark plugs,fuel filter, fuel line.
does the squeeze bulb collapse while running? Do any of the fuel
lines have leaks that will let air in to the system? After that it
could be a coil pack, plug wires perhaps a dirty carb.

mercury outboard won't go full speed - then goes fast, then slow...
 

Just remove the top coweling and put a Yamaha under it.(bad joke)

--
Bill Kiene



"Paul" wrote in message
oups.com...
Try the easiest things, Change spark plugs,fuel filter, fuel line.
does the squeeze bulb collapse while running? Do any of the fuel
lines have leaks that will let air in to the system? After that it
could be a coil pack, plug wires perhaps a dirty carb.