Piaggio Fly 4T servicemanual - Scootergrisen
Piaggio Fly 4T servicemanual - Scootergrisen
Piaggio Fly 4T servicemanual - Scootergrisen
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Engine MSS <strong>Fly</strong> 50 <strong>4T</strong><br />
Removing the piston<br />
- Install piston and wrist pin onto the connecting<br />
rod, aligning the piston arrow the arrow facing to-<br />
wards the exhaust.<br />
- Fit the pin stop ring onto the appropriate tool.<br />
Specific tooling<br />
020448Y Pin lock fitting tool<br />
- With the opening in the position indicated on the<br />
tool, set the lock ring into position in the tool with<br />
the punch.<br />
- Rest the tool on the piston paying attention that<br />
the 90°chamfered side faces upwards as indicated<br />
in the figure.<br />
- Fit the gudgeon pin stop using the plug.<br />
CAUTION<br />
USING A HAMMER TO POSITION THE RINGS CAN DAM-<br />
AGE THE LOCKING HOUSING.<br />
Choosing the gasket<br />
N.B.<br />
MEASUREMENT "A" TO BE TAKEN IS A VALUE OF PISTON RE-ENTRY, IT INDICATES BY HOW<br />
MUCH THE PLANE FORMED BY THE PISTON CROWN FALLS BELOW THE PLANE FORMED BY<br />
THE TOP OF THE CYLINDER. THE FURTHER THE PISTON GETS INSIDE THE CYLINDER, THE<br />
THINNER THE HEAD GASKET TO BE APPLIED SHOULD BE (TO RECOVER THE COMPRESSION<br />
RATIO) AND VICE VERSA.<br />
Characteristic<br />
Shimming system to control the compression ratio<br />
CR: 11.1 ÷ 12.9<br />
ENG - 90<br />
PISTON PROTRUSION CHECK<br />
Name Measure A Thickness<br />
shimming_1 0.05 ÷ 0.25 0.35<br />
shimming_2 0.25 ÷ 0.40 0.25
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