Inspection And Repair - Derbi GPR 125 Racing Workshop Manual

DIAMETER OF THE CYLINDER "C"
TAPER LIMIT "T"
OVALNESS "R"
"C" = D MAXIMUM
"T" = (D1 O D2 MAXIMUM) - (D5 O D6 MAXIMUM)
"R" = (D1, D3 O D5 MAXIMUM) - (D2,D4 O D6 MINIMUM)
- If it is outside that specified , rectify or replace the cylinder
and replace the piston and the rings together.
Step 2:
- Measure the base of the piston "P" with a micrometer. (a)
10 mm from the piston base.
STANDARD
OVER-MEASUREMENT
- If it is outside that specified , replace the piston and the
rings together.
Step 3:
- Calcule el juego cilindro - pistón, empleando la siguiente
fórmula:
Cylinder-Piston clearance:
Diameter of the cylinder "C"
Diameter of the piston base "P".
Clearance (Cylinder-Piston):
0.045 – 0.050 mm
Limit: 0.10 mm
- If it is outside that specified, rectify or replace the cylinder,
the piston and its rings all together.
57
56.00 – 56.02 mm
0.05 mm
0,01 mm
DIAMETER OF THE PISTON P .
55.950 – 59.955 mm
0.25 mm
0.50 mm