SERVICE INFORMATIONSRM-2655SI
3
1-2 Technical data
Engine
Idling speed r/min 2400 - 3000
Operating speed r/min 7000
Wide open throttle speed* r/min 8500 - 10000
Clutch engagement speed r/min 3100 - 3700
Compression pressure MPa (kgf/cm
2
) (psi) 0.98 (9.8) (138)
Ignition system
Spark plug gap mm(in) 0.6 - 0.7 (0.024 - 0.028)
Minimum secondary voltage at 1000 r/min kV 17
Secondary coil resistance kΩ 12 - 13
Pole shoe air gaps mm(in) 0.3 - 0.4 (0.012 - 0.016)
Ignition timing at 1000 r/min °BTDC 25
Carburettor
Main jet #37
Idle adjust screw initial setting turn in** 2 1/2
Idle mixture needle initial setting turn in*** 13 1/2
Test pressure, minimum MPa (kgf/cm
2
) (psi) 0.05 (0.5) (7.0)
Metering lever height mm(in) 1.5 (0.059) lower than diaphragm seat
BTDC: Before top dead centre.
* With two line nylon line head.
** Set idle adjust screw to contact throttle plate before initial setting.
*** Screw in idle mixture needle from initial thread engagement (at the point that the clicking sound is heard).
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