McCulloch Mac 110 - Starting Vapor Locked Engine; Carburetor Adjustment; Breaking in a New Engine; Storing a Chain Saw

8. Pull the starter handle slowly until you feel the starter
engage, then pull with a smooth, rapid, short-stroke
motion. Allow the starter rope to rewind slowly. (Never
let the starter rope snap back from the extended posi-
tion). Repeat until engine starts. @
9. Turn the choke lever clockwise after engine first fires.
10. Squeeze the throttle trigger slightly to release the throttle
latch button.
11. Use the choke and throttle trigger to keep the engine
running until it is warmed up. Do not run the engine at
full throttle unless you are cutting wood ..
12. To stop the engine push the stop switch down to the
"STOP" position.
Starting Vapor Locked Engine
Vapor lock occurs in the carburetors of engines which have
become extremely hot from lengthy continuous use and/or
from use in extremely hot weather. After the.engine has been
shut off for a short time it may not start again due to the vapor
lock.
To re-start an engine that is vapor locked, perform steps 1
through 8 of the normal starting procedure.
When the engine starts, immediately move the choke lever
about halfway forward while alternately squeezing and releas-
ing the throttle trigger as required to keep the engine running.
Slowly move the choke lever to the open position and continue
to squeeze and release the throttle trigger until the engine
- runs smoothly.
CARBURETOR ADJUSTMENT ®
. Carburetor adjustment is critical and if done carelessly can
damage the carburetor and engine.
NOTE: Before making any adjustments make sure the air
filter is clean. Very often a dirty air filter will make the
engine operate as though the carburetor needed adjustment.
Cleaning the filter may correct the problem.
1. Carefully turn the low and high speed mixture needles
clockwise until resistance is felt. Do not turn the needles
in too tight or you can damage the needle tips and their
seats. Then open (turn counterclockwise) each needle 1114
turn.
2. Start the engine and let it warm up at low speed. If the
engine will not idle without stopping, turn the idle speed
screw clockwise until it does.
3. Accelerate the engine several times, adjusting the low
speed mixture needle to obtain a smooth. rap~d accel-
eration without hesitation or falter. If the needle IS turned
in too far, the engine will hesitate or falter when acceler-
ated. If the needle is turned out too far. the engine will run
rough and smoke heavily when accelerated.
4. Adjust the high speed needle for best power under load.
Do not judge by the sound; judge by the way the saw cuts.
Final position of the high speed needle will usually be
between 1114 and 1112.
5. Check idle operation again. It may be necessary to re-
adjust slightly for smooth idle and acceleration.
12
A Choke Lever (Open Position)
B Choke Lever (Closed Position)
C Idle Speed Screw
D High Speed Mixtwe Needle
E Low Speed Mixtwe Needle
F Throttle Latch
BREAKING IN A NEW ENGINE
Breaking in a new chain saw engine is very important. Run
your engine for its first few minutes at one-third throttle.
Increase speed to about half-throttle and run for a few min-
utes longer. Cut a few limbs or small logs at first. Check
chain tension frequently and use the manual oiler button often.
It is advisable to use a slightly richer fuel mixture during the
break-in period. Turn the high speed mixture needle about
one-eighth turn counterclockwise from the normal preliminary
starting position. On carburetors with a fixed high speed jet,
turn the low speed mixture needle one-eighth turn counter-
clockwise from the preliminary setting. After about an hour's
operation, turn the adjusted needle back one-eighth turn
clockwise.
STORING A CHAIN SAW
When storing the saw for short periods or transporting it
with fuel in the tank, always keep the saw level and with the
fuel cap up to avoid leakage from the tank or cap vent.
Never store a chain saw for over 30 days without performing
the following procedures:
1. Drain the fuel tank in a safe prea. @