Joyner SZ250DI Owner's Manual page 23

adjustment.
a. Warm up the engine (5~10min)
b. Tighten the airscrew gentle. Back out 2-3/8 turns counter clockwise.
c. Connect the tachometer; adjust the throttle to limit the idle speed. The
standard value is (1400RPM).
d. Turn the airscrew 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 4 and 5 until the rotate speed of engine stables.
F. Cleaning Instructions
Keep your kart 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.
G. Kart Lubrication
Lubricate vehicle every 90 days of use, Apply several drops of oil in specific
points.
H. Chain Lubrication
To increase chain life, it should be
lubricated with a spray on type chain
lubricant.
I. Chain Adjustment
Check the chain adjustment after first two hours of use. Readjust if it has more
than 1/2" flex. (See figure 12)
a. Loosen NUT M12X1.5 ADJUSTING NUT #1, and ADJUSTING NUT #2.
b. Rotate ADJUSTING BOLT #1 and ADJUSTING BOLT #2,the BEARING
BLOCK will move forwards and backwards, so the chain will become loose and
tight. Repeat this procedure until chain is at proper tension.
c. Tighten NUT M12X1.5 ADJUSTING NUT #1, and ADJUSTING NUT #2.
NUT M12X1.5
ADJUSTING NUT
ADJUSTING BOLT #1
Figure 9
ADJUSTING BOLT #2
Figure 10
22
NUT M12X1.5
ADJUSTING BOLT #2