Honda HRS21 Owner's Manual page 29

Maintenance Schedule
Fuel tube
Check
(Replace, if
necessary)
Every 3 years (2)
(1) Service the air cleaner more frequently when used in dusty areas.
(21 These items should be serviced by an authorized Honda dealer, unless the owner
has the proper tools and is mechanically proficient.
i
See the Honda Shop Manual.
(3) For professional commercial use, log hours of operation to determine proper
maintenance intervals.
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