Joyner JNSZ150DS Owner's Manual page 22

D. Carburetor Adjustment
Never make unnecessary adjustments. The factory recommended settings 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 gentle. Back out 2-3/8 turns counter clockwise (see Fig. 13).
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.
E. Cleaning Instructions
Keep your kart clean. With a clean rag, wipe off the dirt and oil 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.
F. Kart Lubrication
Lubricate vehicle every 90 days of use, Apply several drops of oil in specific
points.
G. Storage Instruction
In the event your kart is not to be operated for periods in excess of 30 days or at the
end of each driving season prepare for storage as follows:
a. Drain fuel tank and carburetor by allowing engine to run out of fuel, or use a fuel
stabilizer.
b. Lubricate engine cylinder by removing the spark plug and pour one ounce of clean
lubricating oil through the spark plug hole into the cylinder. Crank the engine slowly
to spread oil and replace spark plug.
c. Do not save or store gasoline over winter. Using old gasoline, which has
deteriorated from storage, will cause hard starting and affect engine performance.
Do not drain fuel while engine is hot. Be sure to move Go-Kart outside before draining fuel.
SERVICE INSTRUCTIONS
Figure 13
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