SERVICE INFORMATION
CS-500ES
8
2-3 Adjusting carburettor
1. Start and warm engine for 100 seconds alternating
engine speed between WOT and idle every 5 seconds.
Turn H mixture needle (C) anticlockwise until engine
speed drops to approx. 11,400 r/min at WOT.
NOTE :
Do not run engine at high speed without
load longer than 10 seconds, or engine damage
may occur.
2. Adjust L mixture needle (B) using D-shaped tool
(A) to reach maximum engine speed just before
lean drop off.
3. Set idle speed to 3,500 r/min by turning Idle
adjust screw (D). Engine speed should be stable
at 3,500 +/- 50 r/min after Idle adjust screw
adjustment.
4. Turn L mixture needle (B) anticlockwise reduc-
ing engine idle speed 600 r/min to set idle speed at
2,900 r/min. The engine idle speed ranges is 2,800
- 3,000 r/min.
NOTE :
Engine speed must be allowed to stabilize
a minimum of 20 seconds after each adjustment
of L mixture needle to assure accurate tachometer
readings.
NOTE :
If you want make sure idle rich size, pinch
pulse pipe (E) as shown.
5. Before adjustment, WOT engine speed should be 11,400 r/min or less. If engine speed is higher, turn
H mixture needle (C) anticlockwise until 11,400 r/min is achieved. To make the
fi
nal WOT engine speed
adjustment, turn H mixture needle (C) clockwise in 1/8 turn increments with the engine at idle, then
squeeze throttle trigger and check WOT engine speed. The
fi
nal WOT engine speed should fall within
11,800 - 12,000 r/min.
6. Start engine, and verify engine idle speed ranges from 2,800 to 3,500 r/min, and WOT engine speed
ranges from 11,800 to 12,500 r/min. Make sure the chain does not rotate when engine is idling. When
fi
nal adjustment is completed, the engine should idle, accelerate smoothly, and attain WOT per above
speci
fi
cations.
NOTE :
Engine WOT, and idle speed in
fi
eld operation may vary from
fi
nal adjustment speci
fi
cations due
to changing ambient conditions, fuel, and engine loads. Engine speed variances should be within the safe
ranges for WOT and Idling speed as listed in Section 1-2 Technical data, otherwise the carburetor should
be readjusted.
3 SERVICE HINT for PET-9000
Remove starter and connect red probe (A) of PET-
9000 when measuring Ignition timing as shown.
Reinstall starter to start engine.
(B)
(C)
(D)
(E)
(A)
(A)
