4.3l mpi guardian alarm constant beep

by Ray
(Allen Texas)

Boat runs great! But at 4600-4700 rpm (manual shows 4400-4800 max rpm) the guardian alarm goes off at constant beep till I throttle down to 1000 rpm then resets.

Oil pressure good
Temp good
Charging system good.
I still have about 1/4 throttle left to go when rpm hits 4700 and alarm goes off. I have 17p prop and boat is 25’ Bennington tritoon
With 4.3l mpi. Since I have 1/4 throttle left to go would upsizing prop stop this?
Or is throttle not supposed to go all the way down?

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