Slot packing system
Shimming system for keeping the compression ra-
tio
DISTANCE «A» IS A PROTRUSION OR RE-
CESS VALUE OF THE PISTON CROWN WITH
RESPECT TO THE CYLINDER PLANE.
DISTANCE «A» HELPS DETERMINE THE
THICKNESS OF GASKET «B» THAT HAS TO
BE FITTED TO THE CYLINDER HEAD IN OR-
DER TO RESTORE COMPRESSION RATIO.
BASE GASKET «B» MUST BE THICKER THE
MORE THE PLANE FORMED BY THE PISTON
TOP PROTRUDES FROM THE PLANE
FORMED BY THE CYLINDER HEAD. ON THE
OTHER HAND, THE MORE THE PISTON TOP IS
RECESSED INTO THE CYLINDER TOP PLANE,
THE SMALLER THE GASKET THICKNESS.
Characteristic
Compression ratio
10.6 ± 0.5 : 1
BASE GASKET THICKNESS
Name Measure A Thickness
«A» MEASURE TAKEN - 0.185 - - 0.10 0.4 ± 0.05
«A» MEASURE TAKEN - 0.10 - + 0.10 0.6 ± 0.05
«A» MEASURE TAKEN + 0.10 ÷ + 0.185 0.8 ± 0.05
N.B.
VALUES INDICATED WITH «-» REFER TO PISTON CROWN RECESSES WITH RESPECT TO THE
CYLINDER PLANE.
N.B.
DISTANCE «A» MUST BE MEASURED WITHOUT ANY GASKET FITTED AT «B»
Products
RECOMMENDED PRODUCTS TABLE
Product Description Specifications
AGIP ROTRA 80W-90 Rear hub oil SAE 80W/90 Oil that exceeds the
requirements of API GL3 specifi-
cations
AGIP CITY HI TEC 4T Oil to lubricate flexible transmis-
sions (throttle control)
Oil for 4-stroke engines
AGIP FILTER OIL Oil for air filter sponge Mineral oil with specific additives
for increased adhesiveness
AGIP GP 330 Grease for brake levers, throttle White calcium complex soap-
based spray grease with NLGI 2;
ISO-L-XBCIB2
AGIP CITY HI TEC 4T Engine oil SAE 5W-40, API SL, ACEA A3,
JASO MA Synthetic oil
AGIP BRAKE 4 Brake fluid FMVSS DOT4 Synthetic fluid
Characteristics MP3 400 i.e.
CHAR - 14
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