Checking and adjusting the drive belt tension
Apply pressure to check belt tension (approx. 100 N or 10 kgf) in the middle between the pulleys. Measure belt deflection and adjust tension if necessary.
Belt deflection - 9.0-10.4 mm
Valve clearance
There is no need to adjust the intake and exhaust valve clearances.
Replacing the wires of the ignition system
The ignition wires must be replaced periodically with new ones. After replacement, check that the ignition wires are properly connected and placed.
Engine idle speed check
Make sure the idle speed is within specification. If not, adjust it to the standard value.
Idle speed adjustment
Lights, precipitation fan and all electrical equipment off, gear lever in neutral overlay.
1. Set the idle speed to high until the engine temperature (cooler) will not settle between 80 and 90°C.
2. Set the engine speed between 2000 and 3000 rpm. for more than 5 s.
3. Set the idle speed to 2 minutes.
4. Check the idling speed with a tachometer. If it is out of specification, adjust it with the SAS-1 adjusting screw.
Carburetor
Apply detergent to the throttle gear to remove dirt, oil and other deposits. Move the flap in both directions to evenly distribute the detergent.
Throttle position control system
1. Check if the throttle position sensor plunger is sensing the movement of the cam on the throttle shaft well. Check for cracks and damage to the sensor housing and plunger;
2. Use a screwdriver to check the tightness of the throttle position sensor mounting screws.
Throttle actuator
With the engine stopped, remove the air filter from the engine and check the following:
1) Check throttle actuator operation. To do this, move the throttle actuator lever by hand and see how the movement is transferred to the cam located on the throttle shaft.
2) Check for cracks or damage to the throttle position sensor housing.