502xl crusaders - timing/knock sensor

[Dublinup]

Bought a 94 3600 open last season with 502xl motors in it, we are doing all the maintenance during the off season and a friend with the same boat mentions hit mechanic got info from crusader about disconnecting the computer and advancing the timing for better performance and fuel burn, something about the knock sensors going bad and pulling out timing. Does anyone know anything about such a thing, and if so have any details.

Thanks
Cpt. Carl