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ENGINE SPECIFICATIONS
VALVES, VALVE SEATS, VALVE GUIDES
STANDARD
Intake valve clearance (cold)
0.13 ~ 0.19 mm
Exhaust valve clearance (cold)
0.19 ~ 0.25 mm
VALVE SIZE
A
Head ”A” diameter
Intake
Ø 25 mm
Exhaust
Ø 22 mm
B
Contact ”B” specifi c length
Intake
1.9 ~ 2.1 mm
Exhaust
1.75 ~ 1.95 mm
C
Seat ”C” width
Intake
1 ~ 1.1 mm
Exhaust
1 ~ 1.1 mm
B
Contact surface length
Intake
1.9 ~ 2.1 mm
Exhaust
1.75 ~ 1.95 mm
Valve stem diameter
Intake
3.965 ~ 3.98 mm
Exhaust
3.965 ~ 3.98 mm
Clearance between valve stem and valve guide
Intake
0.05 ~ 0.075 mm
Exhaust
0.04 ~ 0.065 mm
Valve stem eccentricity
0.05 mm
VALVE SPRING
STANDARD
Intake/exhaust free length
Outer
38.8 mm
Inner
41.6 mm
Intake
1.2 mm
Exhaust
1.2 mm
CYLINDERS
STANDARD
Cylinder layout
perpendicular line
Bore
69.00-69.01mm (limit 69.02mm)
Compression ratio
11.5:1
Max. ovalization
0.008
0.006
TECHNICAL DATA
COPY - Moto GB - Grant Martland - grantmartland@motogb.co.uk
Summary of Contents for TRK 502
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