- Select the stroboscopic light command in the tra-
ditional four-stroke engine position (1 spark 2
revs).
- Check that the real values of rpm and ignition
advance match those measured using the diag-
nostic tester.
If the values do not correspond, check:
- distribution timing
- rpm-timing sensor
- injection control unit
Specific tooling
020460Y Scooter diagnosis and tester
020330Y Stroboscopic light to check timing
020621Y HV cable extraction adaptor
- To check ignition advance, use the stroboscopic light with induction pincers connected to the spark
plug power wire.
- Connect the induction pincers being careful to respect the proper polarity (the arrow stamped on the
pincers must be pointing at the spark plug).
- Place the light selector in central position (1 spark = 1 crankshaft turn as in 2-T engines).
- Start the engine and check that the light works properly and the rpm indicator can read also the high
rpm (e.g. 8000 rpm).
- If flash unsteadiness or revolution reading error is detected (e.g. half values), increase the resistive
load on the spark plug power line (10 ÷ 15 KΩ in series to HV wire).
LXV 125 Maintenance
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