SERVICE INFORMATION
GT-220ES
SRM-220ES
3
1-2 Technical data
Model
GT-220ES SRM-220ES (L) SRM-220ES (U)
Engine
Idling speed r/min 2600 - 3400
Wide open throttle speed r/min 7000 - 8000* 8000 - 9700* 9500 - 11500**
Clutch engagement speed r/min 3500 - 4100
Compression pressure MPa (kgf/cm
2
) (psi) 0.74 (7.6) (108)
Ignition system
Spark plug gap mm(in) 0.6 - 0.7 (0.024 - 0.028)
Minimum secondary voltage at 1500 r/min kV 15
Primary coil resistance Ω 130 - 200
Secondary coil resistance kΩ 1.0 - 2.0
Pole shoe air gaps mm(in) 0.3 - 0.4 (0.012 - 0.016)
Ignition timing at 3000 r/min °BTDC 27
at 8000 r/min °BTDC 42
Carburettor
Venturi Size mm(in) 9.0 (0.354)
Throttle Bore mm(in) 10.5 (0.413)
Idle adjust screw initial setting turn in*** 1 1/2 2 1/2
Idle mixture needle initial setting turn back
†
2 3/4
Hi speed mixture needle initial setting turns back
†
1 3/8
Test pressure, minimum MPa (kgf/cm
2
) (psi) 0.05 (0.5) (7.0)
Metering lever height mm(in) 0.1-0.25 (0.004-0.010) lower than diaphragm seat
BTDC: Before top dead centre.
* With two line nylon line head.
** With metal blade.
*** Set idle speed screw to the point that its tip just contacts throttle plate before initial setting.
†
Turn Idle/Hi speed mixture needles anticlockwise from point that needle is lightly seated.
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