2002 merc 240 momentary loss of power and sputter at high speed

[Nikon22042]

Was out today with no issues until I was returning to the dock. When I brought the throttle to idle there was a momentary loss of power. The boat slowed and then went on just fine. This was after I was at idle for 1-2 minutes. When I opened the throttle up 5-6krpm I heard it sputtering. Not sure if this is an engine issue or one of the pipes was slightly above the water. Engine seems fine in the 1-4K range.

 

[POPPS]

Check that it is charging,,,they will run like shit if they are not charging,,,if not,, charging,,,test that the stator is charging 25 V at least AC..at idle,,,before you change the regulator.

 

[Nikon22042]

Check that it is charging,,,they will run like shit if they are not charging,,,if not,, charging,,,test that the stator is charging 25 V at least AC..at idle,,,before you change the regulator.

Thanks for the reply, which stator are we talking about?

 

[Tim75]

Thanks for the reply, which stator are we talking about?

If it's electric, the stator under the flywheel.

If it's water, the stator behind the boat.

 

[ripcuda]

Check that it is charging,,,they will run like shit if they are not charging,,,if not,, charging,,,test that the stator is charging 25 V at least AC..at idle,,,before you change the regulator.

Popps, I thought I understood the charging system to not really affecting the ignition system... unless it is killing the battery (no charging or overcharging)?? Would a 1 bad regulator (1 still working)... affect how the engine runs/revs?

Cheers!

 

[POPPS]

I truthfully have had only 3 mercs come in,,,for inconsistent issues,,,and am not a merc xpert,,,just applying basic diagnostics,,,always starting at the battery,,,( load tested)...good connections,,,also,,,check the ground connection to the motor,,,(I will sand all surfaces),,,anyway,,,all 3 were not charging,,,found the yelllow wires at the "handshake"coupler to be heated,,discoloured,.in theb1st case,,,I changed the reg,,,but customer brought it back,,,after many hours of merc searching,,,the stator also charges the hi and low ignition circuits,,,,so I pulled the fly wheel and replaced the stator/ignition,,,when I started it,,,it sounded as if was injected,,sounded amazing,,,(it was carbd),,,sometimes I will cut out the yellow heated coupler with straight butt,connectors,,,to reduce the resistance of the "hand shake.",,,
Therefore as an amateur,,,Having only read numerous merc forums,,,I would replace the stator/ignition,,,and the regulator,,,since the charging circuit and the failing if the hi low ignition coils can cause headaches,...removing the flywheel is so easy,,,and so forbthe extra cost,,,you are eliminating eventual electrical issues from the stator/ji low coil.,,,the heating of the yellow charging coupler wires from the stator to the regulator is very common on older 4tec seadoos,,,just my "3"cents.