- Using a screwdriver rotate the fan, mounted onto
the drive pulley, until the marking on the flywheel
is aligned with that stamped on the flywheel cover,
as shown in the picture.
- Mark the alignment between fan and transmis-
sion cover on the transmission side, as shown in
the picture.
- Refit the spark plug.
- Refit the plastic cover on the flywheel cover.
Characteristic
Spark advance check, 250cc
from 10°± 1° to 2000 rpm
through 28°±1° to 6500 rpm
- Check that the advance degrees match the revolution speed as indicated in the tables.
- In case of abnormal values, check the Pick-Up and the control unit supplies (positive-negative); replace
the control unit, if required.
- A new control unit prevents the engine from rotating at over 2,000 rpm.
- The programmed control unit allows the engine revolution within the prescribed limits.
Specific tooling
020330Y Stroboscopic light to check timing
Spark advance variation
VERSION 125
Specification
Desc./Quantity
Operation threshold First threshold : 10700 ±50
Second threshold : 11000 ±50
Reactivation threshold First threshold : 10600±50
Second threshold : 10900±50
Spark elimination First threshold : 1 spark on 7
Second threshold : 2 sparks on 3
Maintenance B 125-250
MAIN - 44
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