Buell S1 Lightning Workshop Manual page 151

2768a
Figure 3-13. Measuring Rocker Arm Shaft Diameter
(Rocker Arm Bushing Position)
5699
Figure 3-14. Measuring Rocker Arm Shaft Bore
Diameter in Lower Rocker Cover
9. Check end play of rocker arm with feeler gauge.
10. Replace rocker arm or lower cover or both if end play
exceeds 0.025 in. (0.63 mm).
11. Valve heads should have a seating surface width of
0.040-0.062 in. (1.02-1.57 mm), and should be free of pit
marks and burn spots. The color of carbon on exhaust
valves should be black or dark brown. White or light buff
carbon indicates excessive heat and burning.
12. Valve seats are also subject to wear, pitting, and burning.
They should be resurfaced whenever valves are refin-
ished.
13. Clean valve guides by lightly honing with
HONE (Part No. HD-34723).
14. Scrub guides with VALVE GUIDE BRUSH (Part No. HD-
34751) and hot soapy water. Measure valve stem outer
2770a
Figure 3-15. Measuring Rocker Arm Bushing
diameter and valve guide inner diameter. Check mea-
surements against
15. Inspect spark plug threads for damage. If threads in head
are damaged, a special plug type insert can be installed
using a 12 mm spark plug repair kit.
16. Inspect valve springs for broken or discolored coils.
17. See Figure 3-16.
force of each spring. Compare with SPECIFICATIONS. If
spring length is shorter than specification, or if spring
compression force is below specification, replace spring.
18. Examine push rods, particularly the ball ends. Replace
any rods that are bent, worn, discolored, or broken.
19. See Figure 3-17.
flatness. Machine or replace any head which exceeds
SERVICE WEAR LIMIT of 0.006 in. (0.15 mm).
Rocker Arms and Bushings
1. See Figure 3-18.
drive them from the rocker arm. If bushing is difficult to
remove, turn a 9/16-18 tap into bushing. From opposite
side of rocker arm, press out bushing and tap.
2. Press replacement bushing into rocker arm, flush with
arm end, and split portion of bushing towards top of arm.
3. Using remaining old bushing as a pilot, line ream new
VALVE GUIDE
bushing with
No. HD-94804-57).
4. Repeat for other end of rocker arm.
Inner Diameter
SERVICE WEAR LIMITS.
Check free length and compression
Check head gasket surface on head for
To replace worn bushings, press or
ROCKER ARM BUSHING REAMER (Part
3-15