Poulan 210 - Manual (Page 17)

F. CARBURETOR ADJUSTMENTS
Carburetor adjustment is critical and if done improperly can permanently damage the engine as well as the carbure­
tor. Please read all instructions and consult the Tk'oubleshooting section of this manual before beginning this process.
If the engine does not operate according to these instructions after repeating the adjusting steps, do not use the unit.
For further assistance, contact your Authorized Service Dealer.
The carburetor has been adjusted at the factory for sea
level conditions. Adjustments may become necessary if
the saw is used at significantly higher altitudes or if you
notice any of the following conditions:
• Chain moves when the engine runs at idle speed. See
“Idle Speed Adjustment.”
• Saw will not idle. See “Idle Speed Adjustment” and
“Low Speed Mixture Adjustment.”
• Engine dies or hesitates when it should accelerate.
See “Acceleration Adjustment.”
• Loss of cutting power which is not corrected by air
filter cleaning. See “High Speed Mixture Adjust­
ment.”
A
WARNING
The chain will be moving during most of this procedure.
Wear your protective equipment and observe all safety
precautions.________________
A
WARNING
In “Low Speed Mixture Adjustment,” recheck idle
speed after each adjustment. The chain must not move
at idle speed._____________________
CARBURETOR PRESETS (Figure 35)
If your engine will not start due to suspected improper
carburetor adjustment, the following presets may be
required. If used, it is recommended that all steps within
the adjustment procedure be completed in order to
assure a properly set carburetor. If presets are not need­
ed, proceed to section “Idle Speed Adjustment.”
When making adjustments be careful not to force the
plastic limiter caps beyond the stops or damage will
occur.
Veiy small adjustments can affect engine performance. It
is important to turn the screw a very small amount per
adjustment and test performance before making further
adjustments. Each adjustment should be no more than
the width of the slot in the adjusting screw.
► Turn both of the mixture screws counterclockwise
until they stop.
► Turn idle speed screw clockwise until it stops. Now
turn counterclockwise 4 1/2 turns.
• If engine fails to start after performing carburetor pre­
sets, the unit may be flooded.
► Start the engine and operate for three (3) minutes to
warm up. Go to “Adjusting Procedure.”
ADJUSTING PROCEDURE
Idle speed adjustment
• Allow the warm engine to idle.
• Adjust the idle speed screw until the engine contin­
ues to run without stalling and without the chain
moving.
- Turn screw clockwise to increase engine speed if
engine stalls or dies.
- Turn screw counterclockwise to slow engine down
and/or to keep the chain from turning.
• No further adjustments are necessary if the chain
does not move at idle speed and if performance is
satisfactory.
Low speed mixture adjustment
• Allow engine to idle.
• Turn the low speed mixture screw slowly clockwise
until the RPM starts to drop. Note the position.
• Turn the low speed mixture screw counterclockwise
until the RPM speeds up and starts to drop again.
Note the position.
• Set the low speed mixture screw at the midpoint
between the two positions.
High speed mixture adjustment
IMTORTANT: Do not operate engine at full throttle for
prolonged periods while making high speed adjustments
as damage to the engine can occur.
• Make a test cut.
• Based on performance of the saw while cutting,
adjust the high speed mixture screw in 1/16 turn
increments as follows:
- Clockwise if saw smokes or loses power in the cut.
Do not adjust for best power by sound or speed,
but Judge by how well the saw performs in the cut.
- Counterclockwise if the saw has speed while out
of the cut. but dies in the cut or lacks power while
cutting.
• Repeat the test cut.
• Continue with 1/16 turn adjustments until the saw
performance is acceptable while cutting.
• After completing adjustments, check for acceleration.
Acceieration check
• If the engine dies or hesitates instead of accelerating,
turn the low speed mixture screw 1/16 of a turn at a
time counterclockwise until you have smooth accel­
eration.
• Check the idle speed for stability and no chain
movement. Adjust as necessary.
• Recheck for smooth acceleration and stable idle.
Repeat process as necessary for acceptable perfor-
mance.
[CAUTION; IA carburetor setting that is too lean
(clockwise adjustment on high speed screw for maxi­
mum speed) will cause engine damage to any 2-cycle
engine from overheating and lack of lubrication. Never
set the high speed screw so far clockwise that you have
high engine speed lacking power to cut. An effective
approach follows.
- Turn high speed screw counterclockwise until engine
loses power while cutting.
- Turn high speed screw clockwise using 1/16 turn
increments only until the engine has power while cut­
ting.
I