If you are running Mogas the Line Maint manual says 800 hours.
If you are running a gearbox with an overload clutch and over 30% leaded fuel annually the manual says 600 hrs.

If running strictly mogas with an overload clutch the manual says 1,000 hrs.

If running a gearbox without an overload clutch the manual says 600 hrs. no matter what type of fuel.

If you are running a gearbox with an overload clutch you are also supposed to check the friction torque every 100 hrs or at annual (whichever comes 1st).

Maintenance schedules are preventative. If you are waiting until it's "broke" hopefully you are on the ground. Can't see bearings, seals, springs, washers, pitting or spalling without opening it up - whether it runs "smooth" or not! Actually you could see some of it with an endoscope.

Do what you want, but keep in mind you as the owner are responsible for maintaining an airworthy aircraft.

YMMV, Greg