Carburettor
- Disassemble the carburettor in its parts, wash all
of them with solvent, dry all body grooves with
compressed air to ensure adequate cleaning.
- Check carefully that the parts are in good condi-
tion.
-The
throttle valve
should move freely in the
chamber. Replace valve in case of wear due to
excessive clearance.
- If there are wear marks in the chamber causing
inadequate tightness or a free valve slide (even if
it is new), replace the carburettor.
- It is advisable to replace the gaskets at every refit.
WARNING
PETROL IS HIGHLY EXPLOSIVE ALWAYS REPLACE THE
GASKETS TO AVOID PETROL LEAKS
1
. Needle valve -
2
. Idle speed adjustment screw -
3
. Max jet -
4
. Accelerating pump -
5
. Tapered pin -
6
. Jet holder -
7
. Float -
8
. Tank -
9
. Starter device -
10
. Vacuum valve -
11
. Cover -
12
. Minimum jet.
Checking the spark advance
The vehicle is provided with a variable spark advance electronic device. Two reference marks for the
timing can be found on the flywheel cover as to find out with more precision the reference mark on the
fan. To check, use a stroboscopic gun Tecnotest 130/P or similar type. Start the engine and let it run
at 1900 revs/min, act on the phase shifter to align the reference mark on the flywheel fan in between
the two reference marks on the casing; at the same time, read the spark advance value on the strobo-
scopic gun display. The value should be 10°.
Repeat the above operation with engine running at 5000-6000 revs/min, spark advance should be 26°.
CAUTION
SHOULD THE FLASH INDICATIONS BE UNSTABLE AND THE RPM INDICATION DOES NOT
CORRESPOND WITH THE TRUE ENGINE SPEED VARIATION (FOR EXAMPLE, VALUES SHOWN
ARE HALVED), INSTALL A 10 ÷ 15 K
Ω
RESISTIVE CABLE CONNECTED IN SERIES TO AN HV
CABLE. IF THE IRREGULAR READING CONTINUES AFTER THIS OPERATION, CHECK THE
COMPONENTS OF THE IGNITION SYSTEM.
N.B.
WHEN THE INDUCTION CLAMP READS THE SIGNAL CORRECTLY, A READING CAN BE CAR-
RIED OUT AT OVER 6000 RPM.
Maintenance
ET4 50
MAIN - 28
Содержание ET4 50
Страница 1: ...WORKSHOP MANUAL 633367 ET4 50 ...
Страница 4: ......
Страница 6: ...INDEX OF TOPICS CHARACTERISTICS CHAR ...
Страница 16: ...INDEX OF TOPICS TOOLING TOOL ...
Страница 24: ...INDEX OF TOPICS MAINTENANCE MAIN ...
Страница 33: ...494929Y Exhaust fumes analyser 020331Y Digital multimeter ET4 50 Maintenance MAIN 33 ...
Страница 34: ...INDEX OF TOPICS TROUBLESHOOTING TROUBL ...
Страница 40: ...INDEX OF TOPICS ELECTRICAL SYSTEM ELE SYS ...
Страница 56: ...INDEX OF TOPICS ENGINE FROM VEHICLE ENG VE ...
Страница 58: ...INDEX OF TOPICS ENGINE ENG ...
Страница 120: ...INDEX OF TOPICS SUSPENSIONS SUSP ...
Страница 130: ...INDEX OF TOPICS BRAKING SYSTEM BRAK SYS ...
Страница 136: ...INDEX OF TOPICS CHASSIS CHAS ...
Страница 144: ...INDEX OF TOPICS PRE DELIVERY PRE DE ...
Страница 148: ...INDEX OF TOPICS TIME TIME ...
Страница 150: ...Crankcase CRANKCASE Code Action Duration 1 001133 Engine crankcase replace Crankshaft Time ET4 50 TIME 150 ...
Страница 184: ...BRAKE LEVER Code Action Duration 1 002002 Shoes Rear brake pads Replace ment Time ET4 50 TIME 184 ...