Spark plugs life span...

Two or three trips out in a day or two or three rides out.

If your changing the plugs each ride it sounds as if your just temporarily postponing the issue with the engine cool off and fresh plugs.
 
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Location
Stockton
I`m having loss of power/misfires roughly every 2-3 trips out , when the engine is at its hottest about 20 minutes in to a ride , not happy revving out to the max. New plugs seems to sort it out....

My boat had similar use years back and it was the ignition cable had broken strands of wire inside at the plug boots... i also ran an enhancer with non resister plugs and after 20
Minutes the RF interference from
the ignition non resister plugs would start interfering with cdi....
 
Have had similar issues, cut back your plug wires and or replace coil maybe. Just had to buy a new coil for my ski as it was randomly shutting down my ski, like i hit the stop switch.
 
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