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SPARK PLUG
• Check periodically.
• Gap = 0.65 mm (.026”)
• Replace if either electrode is worn or if the insulator is fouled
by oil or other deposits.
• TORQUE = 145 ~ 155 kg•cm (125 ~ 135 in. lb.)
CAUTION Do not over torque.
CARBURETOR ADJUSTMENT
Non Emission Models
Tools Required: Tachometer P/N 99051130010
GENERAL ADJUSTMENTS
• Idle adjustment screw is adjusted not to rotate the saw chain
at idling speed, prior to shipment from factory.
• Remove grommet cover over “H” and “L” limiter needles.
1. Turn Hi and Lo speed mixture needles iclockwise (CW) until
lightly seated.
IMPORTANT: Do not over tighten mixture needles, otherwise
needle tip and carburetor body seat damage may occur.
2. Back Lo speed mixture needle out counter-clockwise (CCW)
1-1/4 turns for CS-3400/3450, and 1-5/16 for CS-3000. Back
Hi speed mixture needle out counter-clockwise (CCW) out 1-
1/2 turns out for the CS-3400/3450 and 1-3/8 turns out for CS-
3000.
3. Turn Idle Speed screw in or out until the tip of the screw
contacts the throttle plate. Then turn it in clockwise (CW) 3
additional turns.
4. Start the engine and conduct initial warm-up at idle for one
minute.
5. Using a tachometer, confirm WOT (Wide Open Throttle)
engine speed. If the WOT (wide open throttle) RPM is above
11,500, enrich the mixture by turning Hi Speed mixture needle
counter-clockwise (CCW) until engine runs between 10,500
and 11,500 RPM.
IMPORTANT: After one minute idle warm-up, to assure
accurate carburetor adjustments, the engine temperature must
be fully and completely stabilized, using the following procedure.
Operate the choke twice during the first minute of WOT (Wide
Open Throttle) warm-up to clear air from the carburetor
chambers. To completely stabilize engine temperature, run the
unit for 5 minutes at a cycle of 15 seconds WOT (Wide Open
Throttle) and 5 seconds idle down period.
IMPORTANT: To avoid engine damage during engine warm-up,
do not run the engine at WOT (Wide Open Throttle) for longer
than 15 seconds at a time, without the 5 second idle down
period.
0.65 mm
(.026”)
Choke button
Grommet
cover
Idle adjustment screw
Hi Lo
FIG. 3
Locating slots
for cap slots
FIG. 4