Checking Ignition Switch; Checking Flywheel Magnets; Replacing Ignition Coil - Bosch PB-650 Service Manual

16

3-6 Checking ignition switch

3-7 Checking flywheel magnets

3K341
(A)

3-8 Replacing ignition coil

(A)
IGNITION SYSTEM
(B)
1. Disconnect lead coupler at bottom of unit and
connect the probes of an ohm-meter or a continuity
tester to the switch side of lead coupler and termi-
nal.
2. When the ignition switch is in RUN position, the
tester should indicate infinite resistance.
3. When the ignition switch is STOP position, the
tester should show that the circuit is in conduction
state (close circuit).
4. If the ignition switch is defective, replace with a
new one.
1. Remove spark plug and engine cover.
2. Disconnect fuel pipes from carburetor.
3. Loosen the bolts for the outer part of fuel tank
band, and then pull out fuel tank.
4. Remove dust cover from bottom of crankcase.
5. Remove ignition coil.
6. Rotate flywheel until the magnets are visible at
the opening of crankcase wall.
7. Check magnetic force of flywheel (A) using flux
meter or bridging with a screwdriver and comparing
with a good one.
8. If it is defective, replace with new one.
1. Remove the spark plug cap, ignition coil, throttle
wire bracket (A) and tube from high tension lead of
the defective ignition coil.
2. Reinstall those parts to high tension lead of a
new ignition coil.
3. Temporarily install ignition coil.
4. Install grommet (B) to high tension lead of the
new ignition coil together with primary lead.
5. Insert the grommet to the notch of crankcase bot-
tom wall.
PB-650
PB-750