Checking Ignition Advance - APRILIA M192M Workshop Manual

ENGINE
3.6.6.

CHECKING IGNITION ADVANCE

•
For this check, a strobe lamp with induction clamps
connected to the spark plug power cable is required.
•
Connect the clamps to the right poles.
•
Set the lamp selector to its middle position (1 spark = 1
turn of the shaft as in 2-stroke engines).
•
Start the engine; ensure that the lamp works properly
and the rev counter can read up to e.g. 8000 rpm.
•
In case of instable flash or rpm reading, increase resis-
tive load on spark plug power line.
• Remove the plastic plug from the flywheel cover slot.
• Turn lamp flash control and match the flywheel cover
mark with the water pump drive level. Read advance
degrees shown by the strobe lamp.
• Check the correspondence between advance degrees
and rev speed as shown in the tables.
• In case of problems, check Pick-up and CPU power
supplies (positive-negative). Replace CPU, if neces-
sary.
• A virgin CPU prevents the engine from exceeding 2000
rpm.
• A programmed CPU allows the engine to run within the
set limits.
Max. 11000 rpm for 125 c.c. Engine
Max. 10100 rpm for 200 c.c. Engine
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Engines M192M / M191M / M245M / M234M / M282M / M281M