Hammerhead UM250IIR 2005 Owner's Manual And Parts Manual page 22

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SERVICE INSTRUCTIONS
a.  Warm up the engine (5~10min)
b.  Tighten the air screw gently. Back it 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 air screw counter clockwise 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.  Recheck and readjust the idle speed if necessary.
E.  Cleaning Instructions
Keep your kart clean. With a clean rag, wipe off all dirt and oil from around the controls. Wipe off any spilled
fuel and oil. Keep the engine clean of foreign objects, and be sure to check that the air intake fan is free of
debris for proper cooling.
F.  Kart Lubrication
Lubricate the vehicle every 90 days of use. Lubrication should be done more often, if the kart is used
everyday.
G. Adjustment of Front And Rear Shock
There are five positions on each shock. The default
position is in the middle set by the manufacturer (See Fig.
10)
Use a round nut wrench as you adjust the shock, the
tension of shock spring will increase as you screw to the
left, decrease as you screw to the right. Adjust according
to the weight of the riders.
Figure 9
Figure 10

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