PIAGGIO X8 125 Workshop Manual page 137

X8 125-200
Engine
CAUTION
TO AVOID SCORING THE FAYING SURFACE, DO NOT
KEEP ROTATING THE VALVE WHEN NO LAPPING COM-
POUND IS LEFT. CAREFULLY WASH THE CYLINDER
HEAD AND THE VALVES WITH A SUITABLE PRODUCT
FOR THE TYPE OF LAPPING COMPOUND BEING USED.
N.B.
DO NOT CHANGE THE POSITIONS THE VALVES ARE FIT-
TED IN
Characteristic
Valve check Standard length
Exhaust: 94.4 mm
Valve check Standard length
Inlet: 94.6 mm
Valve check Maximum admissible clearance
Exhaust: 0.072 mm
Valve check Maximum admissible clearance
Inlet: 0.062 mm
Valve check standard clearance
Exhaust: 0.025 ÷ 0.052 mm
Valve check standard clearance
Inlet: 0.013 ÷ 0.040 mm
Valve check Minimum admissible diameter:
Exhaust: 4.95 mm
Valve check Minimum admissible diameter:
Inlet: 4.96 mm
Valve check Standard diameter:
Inlet: 4.972 ÷ 4.987 mm
Valve check Standard diameter:
Exhaust: 4.96 ÷ 4.975 mm
ENG - 137