Honda BF75D Owner's Manual page 46

CONTROLS AND FEATURES
When "Periodic Maintenance" is
indicated:
1. Have the periodic maintenance
performed without delay after
returning to port.
2. Reset the hour counter. 
If not reset, the maintenance
indication will remain in the
display, and the hour count until the
next maintenance will be in error.
When the periodic maintenance is
conducted before "Periodic
Maintenance" is indicated, reset the
hour counter.
If not reset, the hour count until the
next maintenance will be in error.
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