Shimming Method For Limiting The Compression Ratio: Cr = 10.5:1; Crankshaft/Crankcase Axial Clearance 0.1 - 0.5 Mm (Cold Engine) - PIAGGIO X9 500 cc Service Manual

Vehicle overhaul data
SHIMMING METHOD FOR LIMITING THE COMPRESSION RATIO: CR = 10.5 : 1
+
-
NOTE: THE "A" MEASUREMENT MUST BE TAKEN WITH NO
GASKET FITTED BETWEEN CRANKCASE AND CYLINDER
"A" MEASUREMENT
- 0.185 - - 0.10
- 0.10 - + 0.10
+ 0.10 - + 0.185

Crankshaft/crankcase axial clearance 0.1 - 0.5 mm (cold engine)

1 - 8
N.B.: The "A" measurement is referred to the piston
projection or recess value; it indicates the type of
gasket to be fitted on the cylinder to restore the
compression ratio. Therefore the more the surface
formed by the piston crown sticks out of the surface
formed by the cylinder top, the thicker the gasket will
be. Vice versa, the more the piston crown is hollow to
the cylinder top, the less thick the gasket will be.
FIT THE GASKETS SHOWN IN THE TABLE
ACCORDING TO THE "A" MEASUREMENT
THICKNESS OF BASE GASKET
0.4 ± 0.05
0.6 ± 0.05
0.8 ± 0.05
01_006
01_010