Piaggio Fly 4T servicemanual - Scootergrisen
Piaggio Fly 4T servicemanual - Scootergrisen
Piaggio Fly 4T servicemanual - Scootergrisen
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MSS <strong>Fly</strong> 50 <strong>4T</strong> Engine<br />
- Provisionally fit the piston into the cylinder, without any base gasket.<br />
- Fit a dial gauge on the specific tool, then rest both on a stop surface.<br />
- Zero set the dial gauge on the stop surface. Keeping the zero position, assemble the tool on the cylinder<br />
and lock it with 2 nuts as shown in the figure.<br />
- Rotate the crankshaft until TDC (the inverted point of the dial gauge rotation)<br />
- Measure piston protrusion compared with the head plane and determine the gasket thickness to be<br />
used according to the table below. By correctly identifying the cylinder base gasket thickness, an ade-<br />
quate compression ratio is maintained.<br />
- Remove the specific tool and the cylinder.<br />
Characteristic<br />
Standard compression ratio<br />
C.R. 11.5 ÷ 12 ÷ 1<br />
CYLINDER BASE GASKET THICKNESS<br />
Specification Desc./Quantity<br />
Cylinder height 56.45 ± 0.05<br />
Head gasket thickness (fibre) 0.95 ± 0.06<br />
Measure detected 0.9 ± 0.05<br />
Base gasket thickness 0.4<br />
Measure detected 1 ± 0.05<br />
Base gasket thickness 0.5<br />
ENG - 91
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