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
298
#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.
