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 />
40 ÷ 50 cm<br />
- Connect the tester thermometer to the sump, us-<br />
ing a cover with oil expressly prepared for probes.<br />
- Start the engine and before adjusting the idle<br />
speed, make sure that the oil temperature is be-<br />
tween 70÷80 °C.<br />
Specific tooling<br />
020331Y Digital multimeter<br />
- Using the rpm indicator in the analyser or a sep-<br />
arate one, adjust the idle screw.<br />
N.B.<br />
THE WASTED SPARK IGNITION SYSTEM OFFERS RE-<br />
MARKABLE POWER. READINGS MAY NOT BE ACCU-<br />
RATE IF INADEQUATE RPM INDICATORS ARE USED.<br />
Specific tooling<br />
020332Y Digital rev counter<br />
Characteristic<br />
Idle speed<br />
about 1900/2000 rpm<br />
- Adjust the flow screw until a percentage of carbon<br />
monoxide (CO) is obtained. When the screw is<br />
loosened the CO value rises (rich mix). Tightening<br />
the screw decreases the CO (lean mix).<br />
- If the adjustment of the flow screw causes a rpm<br />
increase readjust the revs again and if necessary,<br />
the flow screw to reach stable values.<br />
Characteristic<br />
CO adjustment<br />
3,2% ± 0,5<br />
- When the oil temperature, the numbers of revs and the percentage of carbon monoxide are respected<br />
the idle carburetion is considered correct.<br />
- Further information can be drawn from the analyser:<br />
- carbon dioxide percentages (CO2), the percentage of carbon dioxide has an inverted course compared<br />
to the percentage of (CO), values over 13% are considered correct.<br />
- Non complying values indicate lack of tightness in the exhaust system.<br />
- Unburned hydrocarbons (HC) are measured in parts per million (PPM). The HC value decreases while<br />
the rpm increases; with the engine at idle it is normal to obtain 200 ÷ 400 PPM, these emission values<br />
are deemed normal for an engine with a diagram of timing for motorcycles. Higher values can cause<br />
ENG - 123