SERVICE INFORMATION
CS-501SX, CS-501SXH
501sx
3
1-2 Technical data
Models CS-501SX, 501sx CS-501SXH
Engine
Compression pressure MPa (kgf/cm
2
) (psi) 0.95 (9.7) (138)
Clutch engagement speed r/min 3,900
Ignition system
Spark plug gap mm(in) 0.6 - 0.7 (0.024 - 0.028)
Spark test Tester gap w/ spark plug mm(in) 4.0 (0.16)
Tester gap w/o spark plug mm(in) 6.0 (0.24)
Secondary coil resistance kΩ 2.5 - 2.9
Pole shoe air gaps mm (in) 0.3 - 0.4 (0.012 - 0.016)
Ignition timing at 3,000 r/min °BTDC 20 19
at 8,000 r/min °BTDC 32 30
at 10,000 r/min °BTDC 34 34
Carburetor
Test Pressure, minimum MPa (kgf/cm
2
) (psi) 0.05 (0.5) (7.0)
Metering lever height mm(in) 1.65 (0.06) lower than diaphragm seat
Tool to adjust mixture needles
D-shaped tool (L) P/N X645-000031
(Carb. adjustment tool P/N Y089-000094)
Carburetor adjustment
Before carburetor adjustment :
--- Turn off heater switch.
1) Initial setting H mixture needle turn out 3 5/8
L mixture needle turn out 1 3/4
Throttle adjust screw turn in*
1
2 1/8
Engine warm-up Idle - WOT : Total sec. 5 - 5 : 100
2) Find idle maximum speed Adjust L mixture needle to maximum idle speed*
2
3) Set idle maximum speed w/ TAS r/min 3,500
4) Set idle speed
by turning L mixture needle CCW
r/min 2,700
5) Confi rm H mixture needle position
before WOT setting
Turn H mixture needle CCW to confi rm engine speed
decreases less than or equal to 12,500 r/min.
6) WOT setting r/min
Turn H mixture needle CW in 1/8 turn increments
with the engine at idle, then accelerate to WOT and
check engine speed.The fi nal engine speed should
fall within: 13,000 - 13,800
7) Verify fi nal engine speed with standard equipment Idle: 2,300 - 3,100
r/min WOT: 13,000 - 13,800
8) Verify clutch engagement speed
Confi rm clutch engagement speed.
If it is less than 1.25 times the idle speed, adjust
the idle speed by turning TAS CCW.
Chain oil discharge volume at 7,000 r/min
mL/min (US.fl .oz./min)
Ajustable: 3.0 - 16.5 (0.12 - 0.65)
(Factory set: 7 mL/min)
BTDC:
Before top dead center
WOT:
Wide open throttle
CCW:
Counterclockwise
TAS:
Throttle adjust screw
*
1
Set Throttle adjust screw to the point that its tip just contacts throttle plate before initial setting.
*
2
If chain starts to rotate during adjustment process step 2), decrease engine speed by turning TAS CCW
until chain stops and then redo step 2). Repeat this until chain no longer rotates after the adjustment step 2).
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