Suzuki DF25/DF30 Four Stroke Service Manual, Page 36Get this manual
PERIODIC MAINTENANCE 2-9
VALVE CLEARANCE
Inspect initially after 20 hours (1 month) and every 200 hours (12 months) thereafter
CHECKING AND ADJUSTING VALVE CLEARANCE Checking (1) Remove following partsEngine side lower cover (see page 8-2) Recoil starter (Manual start model) Flywheel cover (Electric start model) Spark plugs