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LO SPEED MIXTURE ADJUSTMENT
1. Adjust the Lo speed mixture needle in clockwise (CW) until
maximum idle RPM (just before lean drop off) is achieved.
NOTE: Engine RPM must be allowed to stabilize a minimum of
20 seconds after each adjustment .
2. Turn the Idle speed adjusting screw to achieve idle of 4,000
RPM.
3. Using tachometer, rich down by adjusting Lo speed mixture
needle out counter-clockwise (CCW) until engine reaches
3,000 RPM at idle.
HI SPEED MIXTURE ADJUSTMENT
1. Turn the Hi speed mixture needle or counter-clockwise (CCW)
out (richer) until the RPM is between 10,500
and 11,500.
2. Turn limiter caps counter-clockwise (CCW), so that the limiter
cap stops, align with locating slots in the carb body. Place
limiter caps over respective mixture needles. (See Fig. 3)
3. With a flat end tool, push both limiter caps down gently and
completely on to their respective needles. (See Fig. 4) Push,
do not hit the limiter caps. Make sure the mixture needles do
not move while the caps are being installed.
4. Install needle access cover to prevent dirt entry into carb
airbox.
(CAUTION)
When starting, idling adjustment speed should be adjusted not
to rotate the saw chain.
Correct idle speed is adjusted 2900 to 3100 rpm. Or 1/4 turn
counter clockwise from the point the chain stops moving.
When there is some trouble with the carburetor, refer to your
distributor or dealer.
CARBURETOR ADJUSTMENT
Emission Models
Before starting the unit for adjustment, check the following items:
• The correct spark plug must be clean and properly gapped.
• The air filter element must be clean and properly installed.
• The muffler spark arrestor screen and exhaust port must be
clear of carbon.
• The standard bar and chain combination (see page 4) must be
installed to the power head, and properly tensioned.
1. Start engine and run for several minutes to reach operating
temperature.
2. Stop engine. Remove grommet cover (A) over “H” and “L” limiter
needles.
3. Turn HI speed needle (H) CCW (counter clockwise) to stop.
Turn LO speed needle (L) CCW (counter clockwise) to stop.
B
A