68
7.11
Checking the Spark Advance
-
To check the spark advance, use the
stroboscopic light with the induction clamp
connected toe the spark plug feeder cable.
-
Connect the induction clamp paying
attention to the polarity (the arrow on the
clamp must be facing the spark plug).
-
Set the lamp selector to the central position
(1 spark = 1 crankshaft revolution as in 2
stroke engines).
-
Start the engine and check that the lamp
works properly and that the revolution
counter can also read high engine speeds
(e.g. 8,000 rpm).
-
If flashing or rpm reading instabilities are
noted, increase the resistive load on the
spark plug feeder cable (10-15 kO in series
with the H.T. cable).
-
Remove the plastic cover from the slotted
hole on the flywheel cover.
-
Using the lamp flash phase shift corrector,
align the reference mark on the flywheel
cover with the level on the water pump
drive. Read the degrees of advance on the
stroboscopic light.
-
Check the revolving speed corresponding to
the degrees of advance in the tables below.
-
If any discrepancy is found, check the pick-
up and the control unit feeders (positive-
negative). If necessary, replace the control
unit.
-
An un-programmed control unit prevents
the engine from exceeding 2,000 rpm.
-
A programmed control unit allows the
engine to revolve within the prescribed
limits.
Spark advance:
from
10°±1° @ 2,000 rpm
to
32°±1° @ 6,000 rpm
Specific tools and equipment:
Timing Light
020330Y
Summary of Contents for GT 200
Page 1: ......
Page 90: ...90 9 1 2 Turn Signal Lights Horn Services and Accessory Pre Wiring ...
Page 151: ...151 10 10 Lubrication Circuit ...
