Derbi Dirtboy 10 Workshop Manual page 28

E E ENGINE
E N G I N E
R R
EFITTING THE PISTON RINGS EFITTING THE PISTON RINGS
- Fit the scraper starting with the spring. Ensure that the scra-
per ends do not overlap.
- Fit the two piston rings so that their gaps and that of the
scraper are never aligned.
- Fit the 2nd piston ring with the identification letter «T» fa-
cing the piston top.
- Fit the 1st piston ring with the «T» reference mark facing
the piston top.
N.B.
TO ENSURE OPTIMUM BEDDING, THE TWO PISTON RINGS
HAVE CONICAL SECTIONS IN THE AREAS OF CONTACT
WITH THE CYLINDER. FOR THIS REASON, IT IS IMPORTANT
THAT THE RINGS SHOULD BE FITTED WITH THE «T» FACING
UPWARDS. STAGGER THE PISTON RING GAPS BY 120 DE-
GREES AS SHOWN IN THE FIGURE. LUBRICATE THE PARTS
WITH ENGINE OIL.
R R
EFITTING THE CYLINDER EFITTING THE CYLINDER
Install the base gasket with the previously determined thic-
kness. Carry out the refitting procedure for the cylinder as
shown in the figure.
Ensure to drive the timing chain through its housing while
maintaining it engaged on the timing gearshaft.
C
HARACTERISTIC
Cylinder base gasket thickness:
0,5
28
- CYLINDER ASSY. AND TIMING SYSTEM
- CY LINDE R A SS Y. A N D T IMING SYST EM