Cleaning Instructions; Vehicles Lubrication - Joyner JNSZ650DL Owner's Manual

are correct for most applications. It's not necessary to disassemble the screw
unless the carburetor needs to be replaced. Prepare a 50r/w tachometer before
adjustment.
a. Warm up the engine (5~10min)
b. Tighten the air screw gently. Back out 2-3/8 turns counter clockwise (see
Figure 25).
c. Connect the tachometer, adjust the throttle to limit the idle speed. The
standard value is (1400RPM).
d. Turn the air screw counter slowly and observe the RPM of the engine, stop
adjusting as the RPM reaches the top speed.
e. Adjust the screw and adjust the idle speed to an ideal value.
f. Repeat step d and e until the rotate speed of engine stables.

Cleaning Instructions

Keep your vehical clean. With a clean rag, wipe off and dirt and oil from
around controls. Wipe off any spilled fuel and oil. Keep the engine clean of
foreign object and be sure to check that air intake fan is free of debris for proper
cooling.

Vehicles Lubrication

Lubricate vehicle every 90 days of use, Apply several drops of oil in specific
points shown as following picture
Figure 25