Honda F501 Owner's Manual page 10

Transmission gear oil
Place the tiller on a level surface and remove the oil filler cap.
The oil should be level with the lower edge of the oil filler hole.
Add recommended engine oil if the level is low.
OIL FILLER HOLE
Air cleaner
Check cleaner for dirt or obstruction of elements. (See page 22 for clean-
ing instructions.)
AIR CLEANER COVER
ELEMENTS
9