Echo SRM-3805, Service Data

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1-2 Technical data
Model SRM-3805 SRM-4605
Engine
Idling speed rpm 2400 - 3000
Operating speed rpm 6000 - 8000
Clutch-in speed rpm 3300 - 3700
Compression pressure, standard kgf/cm
2
(psi) 7.5 (107) 8.0 (114)
Ignition system
Spark plug gap mm(in) 0.6 - 0.7 (0.024 - 0.028)
Minimum secondary voltage at 1000 rpm kV 15
Secondary coil resistance k
Ω
1.0 - 1.5
Pole shoe air gaps mm(in) 0.3 - 0.4 (0.012 - 0.016)
Ignition timing °BTDC 25
Carburetor
Type Diaphragm horizontal-draught
Supplier Walbro WT-297 Walbro WT-120B
Venturi Size mm(in) 11.11 (0.437) 12.7 (1/2)
Throttle Bore mm(in) 15.85 (0.624) 15.85 (0.624)
Idle speed screw initial setting turn in 2 2
H needle initial setting turn back 1 1/2 1 1/4
L needle initial setting turn back 1 1
Test Pressure, minimum kgf/cm
2
(psi) 0.5 (7.0)
Metering lever height mm(in) 1.65 (0.065) lower than diaphragm seat
BTDC: Before top dead center.
H needle: High speed needle.
L needle: Idle needle.
3
SERVICE INFORMATION
SRM-3805
SRM-4605