Honda BF15D - Page 175

BF15D-BF20D
33.28 mm (1.310 in)
4) Remove and inspect the valve seat face. The valve seat
contact should be within the specified width and even all
around the circumference.
32.0 mm (1.26 in)
Standard
I Servicelimit 1
I
1 .O mm (0.04 in) 1 2.0 mm (0.08 in) I
Inspect the valve seat face for:
Uneven seat width: replace the valve and reface the
valve seat.
Damaged face: replace the valve and reface the valve
seat.
Contact area too high or too low: reface the valve seat
The valve cannot be ground. If the valve face is burned
or badly worn or if it contacts the seat unevenly,
replace the valve.
(P. 10-14).
4.975
- 4.990 mm 4.95 mm
~ Intake 1 (0.1959 - 0.1965 in) I (0.195 in) I
4.955 - 4.970 mm
4.93 mm
~ (0.1951 - 0.1957 in) 1 (0.194 in)
I Exhaust
I
VALVE SPRING FREE LENGTH
Measure the valve spring free length.
I Standard 1 Service limit I
[l] UNEVEN SEAT [2] TOO HIGH
WIDTH
[3] DAMAGED FACE [4] TOOLOW
10-1 3