2007 Buell Lightning: Engine 3-49
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Valves
1. Replace the valve if there is evidence of burning or
cracking.
2. Inspect the end of the valve stem for pitting or uneven
wear. Replace the valve if either of these conditions are
found.
3. Inspect for burrs around the valve stem keeper groove.
Remove burrs with a fine tooth file if found.
Valve Seats
NOTE
Valve seats are also subject to wear. Resurface valve seats
whenever valves are refinished.
1. Inspect seats for cracking, chipping or burning. Replace
seats if any evidence of these conditions are found.
2. See Figure 3-67. Check seats for recession by measur-
ing valve stem protrusion.
a. Wipe valve seats and valve faces clean.
b. Measure valve stem protrusion.
c. If valve stem protrudes more than 2.031 in.
(51.587 mm), replace valve seat or cylinder head.
NOTE
Replacing a valve seat is a complex operation requiring spe-
cial equipment. If the seat is loose or is not fully seated in the
head, then seat movement will prevent the proper transfer of
heat from the valve. The seat surface must be flush with (or
below) the head surface. See 3.1 SPECIFICATIONS for valve
seat-to-cylinder head fit.
Valve Guides
1. Clean valve guides by lightly honing with VALVE GUIDE
HONE (Part No. HD-34723).
2. Scrub guides with VALVE GUIDE BRUSH (Part No. HD-
34751) and hot soapy water. Measure valve stem outer
diameter and valve guide inner diameter. Check mea-
surements against 3.1 SPECIFICATIONS.
Valve Springs
1. Inspect valve springs for broken or discolored coils.
NOTE
A single valve spring activates each valve. The inner and
outer springs are combined into one tapered spring that is
progressively wound.
2. See Figure 3-68. Check free length and compression
force of each spring. Compare with 3.1 SPECIFICA-
TIONS. If spring length is shorter than specification or if
spring compression force is below specification, replace
spring.
Spark Plug Threads
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.
Push Rods
Examine push rods, particularly the ball ends. Replace any
rods that are bent, worn, discolored or broken.
Figure 3-67. Measuring Valve Stem Protrusion
5696
Figure 3-68. Checking Spring Free Length
b0966x3x
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