SERVICE INFORMATION
GT-225
SRM-225
3
1-2 Technical data
Model GT-225 SRM-225
Engine
Idling speed rpm 2,900 +/- 400
Wide open throttle speed rpm* 6,900 - 8,100 7,600 - 8,700
Clutch engagement speed rpm 3,850 - 4,100
Compression pressure MPa (kgf/cm
2
) (psi) 0.66 (6.7) (96)
Ignition system
Spark plug gap mm(in) 0.6 - 0.7 (0.024 - 0.028)
Minimum secondary voltage at 1500 rpm kV 15
Primary coil resistance
320 - 420
Secondary coil resistance k
2.7 - 3.3
Pole shoe air gaps mm(in) 0.30 - 0.40 (0.012 - 0.016)
Ignition timing at 1,000 rpm °BTDC 17
at 3,000 rpm °BTDC 27
at 8,000 rpm °BTDC 42
PET-9000 Parameter #1 29 8
#2 03
Carburetor
Venturi Size mm(in) 9.0 (0.354)
Throttle Bore mm(in) 10.5 (0.413)
Idle adjust screw initial setting turn in** 2 1/2 2 3/8
Idle mixture needle initial setting turn back*** 2 7/8 2 5/8
Hi speed mixture needle initial setting turn back*** 3/4
Test Pressure, minimum MPa (kgf/cm
2
) (psi) 0.05 (0.5) (7.0)
Metering lever height mm (in) 0.1-0.25 (0.004-0.01) lower than diaphragm seat
BTDC: Before top dead center.
*With Nylon line cutter and shield.
** Set idle speed screw to the point that its tip just contacts throttle plate before initial setting.
***Turn Idle/Hi speed mixture needles counterclockwise from point that needle is lightly seated.
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