54
which the lowest meter reading occurs or at which the continuity tester light dims. (Note that the ohm
meter never reads "0" or the light never goes out entirely because the condenser is grounded). This is the
point at which the spark plug fires.
5. When this point has been located, note the relationship of the timing marks to each other. The best
setting is about 2E retarded from the ignition angle established by the perfectly aligned timing marks.
The ignition mark is 3/32" below the center of the stationary mark, (See Fig. 113)
• CAUTION: adjustments must be made if ignition occurs before the flywheel mark reaches the magneto
case mark. (In this case timing is too far advanced.)
6. To adjust timing, measure point
gap at its widest open position.
(The timing marks will not be
aligned when this gap is
measured.)
a. To retard spark, close the point
gap by .001" at a time until the
light dims (when the flywheel
mark is 3/32" below the
magneto case mark. Secure the
point adjusting screw and
recheck.
b. To advance spark, open the
point gap .001" at a time until
the tester light dims when the
marks are aligned as in Fig.113.
• NOTE: It should be possible to time the engine by point adjustment alone if the magneto armature plate
has not been moved from its factory setting. The contact point gap can be anywhere between .012 to
.016".
• If the engine cannot be timed with the resulting point gap within this range, loosen the three armature
plate screws and move the plate slightly in the direction you want the flywheel mark to move for proper
alignment as shown in Fig. 113. Then proceed to make fine timing adjustments as set forth above.
Condenser: (Fig. 111 ) The condenser is mounted on the armature plate and its function is to absorb the
current generated when the contact breaker points open. It also assists the functioning of the ignition coil.
Always check the condenser whenever the contact points are changed in the event that it might need
changing too should it not meet the specifications required.
Spark Plug: The table below indicates the correct spark plugs for the 90cc. 50cc Sport and 60cc Sport
models:
MODEL
PLUG
BRAND
USE CODE
A B C D E
BS-5OSport
BS-60Sport
NGK B-7 B-6 B-8C B-8C B-8N
Champion J4 or J8 or J8J J62R J60R J57R
BS-90
BS-90 Trail
NGK B-7H B-6H B-7HC or B- B- B-
Champion L62R L7 L-60R L57R L-54R
BS-90
Mountain
NGK B-7H B-6H or B- B-7HC or B- B- B-
Champion L62R L7 L60R L57R L-54R
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