Cylinder - Piston Wear Condition; Reeds Valve, Intake Boot - SHERCO 125 Workshop Manual

ENGINE PARTS CHECK
❱❘ Cylinder – piston wear condition
• To determinate cylinder wear, measure cylinder bore with a dial bore gauge, about 10 mm from
the cylinder deck. Make a cross-measurement in order to check ovalization.
Ø Piston
Ø Cylinder
Clearance
❱❘ Reeds valve, intake boot
Over time, the carbon reeds gradually lose
•
their elasticity, which causes a loss of power.
Replace used or frayed reeds, taking care of
•
applying threadlocker on the stoppers screws.
Check intake boot condition, especially
•
looking for cracks.
34
125cc
A B
53,96 53,97
53,975 53,985
0,015 0,020
ST SERIES
250cc
A B
72,76 72,77
72,79 72,816
0,04 0,046
300cc
A B
78,95 78,96
79 79,016
0,05 0,056