Benelli TRK 502, Service Station Manual

Page: 284 / 408

5 - 31
HEAD DISTRIBUTION
CYLINDER CHECK
Remove:
1. Coils and Spark plugs, see the section entitled “Coil and
spark plug removal ”.
2. Head timing gear cover, see chapter entitled “Head timing
gear cover removal”
3. Head see chapter entitled “Head removal”
The following procedure applies the whole cylinder group.
Check:
• the cylinder walls with a special tool Fig. A.
If there are any vertical lines, replace the cylinder and the piston
all together and the relevant clips.
Measure:
• The cylinder bore Fig. B
Make different measurements at different distances of 10-43-90
mm from the head coupling surface.
The highest value is considered when calculating wear limits.
CYLINDER bore (C) = 69 (+0.01 , +0.02)
C=Max D1 or D2 65
Limit conicity:
•
Max D1= 0.5 mm
• Max D2= 0.5 mm
• Max D3= 0.5 mm
• Max D4= 0.5 mm
• Max D5= 0.5 mm
Limit eccentricity:
•
Max D1= 0.5 mm
• Max D2= 0.5 mm
• Max D3= 0.5 mm
• Max D4= 0.5 mm
• Max D5= 0.5 mm
A
B
- 0.002
- 0.003
mm
COPY - Moto GB - Grant Martland - grantmartland@motogb.co.uk