5 - 12
CAMSHAFT CHECK
HEAD DISTRIBUTION
Make a visual check of the camshaft lobes and if there is any
blue discolouration/pitting or lines, replace.
• Measure the size of the lobes.
If the measures taken (Fig. E) are not compliant with specifi ca-
tions, replace the shaft.
Specifi cations Table
Camshaft
Limit
(a)
Limit
(b)
Camshaft exhaust side 31.9 mm 24.82 mm
Camshaft intake side 32.2 mm 24.85 mm
• Measure the eccentricity of the camshaft
If the measures taken (Fig. F) are not compliant with specifi ca-
tions, replace the shaft.
Specifi cations Table
Camshaft Eccentricity limit
Camshaft exhaust side 0.05 mm
Camshaft intake side 0.05 mm
• Measurement of clearance between camshaft main
bearing bolts and holder
If the measures taken (Fig.G) are not compliant with specifi ca-
tions, replace the head gear and holder block.
Specifi cations Table
Camshaft
Clearance between bearing
journals and camshaft
Camshaft outlet side 0.012 mm
Camshaft intake side 0.012 mm
• Measure the diameter of the camshaft support
If the measurements taken (Fig.H) are not within the specifi ca-
tions, proceed with shaft replacement.
Specifi cations Table
Camshaft
Measurement of main bea-
rings (C)
Camshaft exhaust side
Ø 23 mm(-0.03/-0.043)
Camshaft intake side
A
B
E
F
G
C
H
COPY - Moto GB - Grant Martland - grantmartland@motogb.co.uk
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