3.19
ENGINE
CAMSHAFT INSPECTION
1. Thoroughly clean the camshaft.
2. Visually inspect each cam lobe and bearing journal for
wear, scoring, or damage. Verify oil delivery passages
are clean.
3. Check the automatic decompressor spring legs and
replace if broken. Spring preload is very light (about
45 degrees).
4. Measure the height of the cam lobes with a
micrometer and compare to specification. Replace
cam if worn below minimum height (service limit).
.
CYLINDER HEAD REMOVAL
NOTE: Cam chain and tensioner must be removed. If no
crankshaft service is being performed, secure cam chain
with wire to avoid dropping chain into the crankcase.
1. Remove the (two) 6mm screws on the cylinder head
and the two on the cylinder base.
2. Loosen each of the four cylinder head bolts evenly
1/4 turn each time in a cross pattern until loose.
3. Remove bolts (A) and tap the cam support tower with
a plastic hammer until loose. Remove.
4. After removing the camshaft and securing the cam
chain, tap cylinder head lightly with a plastic hammer
until loose. CAUTION: Tap only in reinforced areas or
on thick parts of cylinder head casting.
5. Remove cylinder head, gasket, front chain guide and
dowel pins.
CYLINDER HEAD INSPECTION
1. Thoroughly clean cylinder head surface to remove all
traces of gasket material and carbon.
Cam Lobe Height
Intake & Exhaust
Std: 1.2938”-1.2977 (32.863-32.963 mm)
Limit: 1.2820” (32.563 mm)
CAUTION
Use care not to damage sealing surface. If there is
damage found on the cylinder head combustion
chamber, it is recommended the component be re-
placed.
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