ELECTRICAL and IGNITION - 2C-190-817643R1 DECEMBER 1996
Timing/Synchronizing/
Adjusting
Specifications
IDLE RPM IN
(FORWARD GEAR)
FULL THROTTLE RPM
SPARK PLUG TYPE
50/55/60
50/60-22
° BTDC 55-16° BTDC
50/60-24° BTDC 55-18° BTDC
2 - 6
° ATDC
650 - 750 RPM
IDLE TIMING
MAXIMUM TIMING
@ 5000RPM
FIRING ORDER 1 - 3 - 2
5000 - 5500 RPM
(@ Cranking Speed)
NGK BP8H-N-10 *
NGK BPZ8H-N-10**
* 50/55/60 Models, Serial No. D000750 to D181999, came
standard with NGK BU8H spark plugs. NGK BP8H-N-10
can be used in these models.
** Suppressor (Resistor) Spark Plug.
Special Tools
Part Number Description
*91-58222A1 Dial Indicator Gauge Kit
*91-59339 Service Tachometer
*91-99379 Timing Light
91-63998A1 Spark Gap Tool
*May be obtained locally.
Timing Pointer Adjustment
IMPORTANT: Models equipped with adjustable timing
pointer or .459 mark on flywheel require the following
procedure before timing engine.
! WARNING
Remove all spark plugs from engine to prevent engine
from starting.
1. Remove three (3) spark plugs.
2. Install dial indicator into No. 1 (TOP) cylinder.
51046
51128
91-58222A1
3. Turn flywheel clockwise until No. 1 (TOP) piston is at
top dead center (TDC). Set dial indicator to “0” (zero).
4. Turn flywheel counterclockwise until dial indicator
needle reads .550 in. (14.0 mm) BTDC, then turn fly-
wheel clockwise until needle reads .459 in. (11.7 mm)
BTDC exactly.
5. Flywheel cover timing pointer (a) should align exactly
with .459 (14.0 mm) timing mark (b) on flywheel. If not,
loosen two (2) timing pointer attaching screws (c) and
adjust pointer. After adjusting pointer, torque attaching
screws to 20 lb. in. (2.26 N·m).
51046
a
b
c c
6. Remove dial indicator from No. 1 (TOP) cylinder.
To Next Page
Loading...
