Suzuki DF 25, Service Manual, Page: 29 / 148

2-8 PERIODIC MAINTENANCE
VALVE CLEARANCE
CHECKING
1. Remove the following parts:
• Motor cover (See page 5-2)
• Recoil starter (See page 5-2)
• Spark plug
2. Remove the four bolts
1
and the cylinder head cover
2
.
3. Rotate the flywheel clockwise to bring the piston to the Top
Dead Center (TDC) on a compression stroke.

NOTE:
• To confirm whether the piston is at the TDC position on a com-
pression stroke or on a exhaust stroke, rotate the flywheel
within ±15° beyond the TDC position.
- If both rocker arms do not move at all, the piston is at the posi-
tion on a compression stroke.
- If any rocker arm moves, the piston is at the TDC position on
an exhaust stroke. Rotate the flywheel one more turn.
• The valve clearance specification is for COLD engine condi-
tion.
Inspect initially after 20 hours (1 month) and every 200
hours (12 months) thereafter.
Rotate the crankshaft clockwise to prevent water
pump impeller damage.