Part III Maintenance
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Standard engine idle rotation speed: 1,800±150 rpm
3-8 Adjustment of speed regulator
Mechanical speed regulating engine
1. Loosen the fastening nut of speed-regulating arm.
2. Rotate the speed-regulating support till the valve is fully opened and fix it at the location.
3. Rotate the speed-regulating arm anticlockwise till the end (i.e. position that the speed regulator is fully closed)
and then fasten the nut.
4. Check if activities of the speed-regulating support and valve are flexible.
5. Start the engine to warm it till it achieve the normal operating temperature, and then adjust it to the specified
working rotation speed.
Electronic adjustable speed engine
Carburetor with step motor Electronic speed controller
1. Determines the program commands in the control module
Speed-regulating arm
Speed-regulating support
Speed-regulating spring
Throttle control
handles
Accelerator, rope
Fuel control assy.
Throttle pull
rod
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