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21
CaRbuRetoR aDjustment
Engine Break-In
New engines must be operated a minimum duration
of two tanks of fuel break-in before carburetor ad-
justments can be made. During the break-in period
your engine performance will increase and exhaust
emissions will stabilize. Idle speed can be adjusted
as required.
BEFORE MAKING ADJUSTMENTS:
• The correct spark plug must be clean and prop-
erly gapped.
• The air lter element must be clean and properly
installed.
• The mufer spark arrestor screen and exhaust
port must be clear of carbon.
• The standard bar and chain combination must be
installed to the power head, and properly ten-
sioned.
LOW ALTITUDE ADJUSTMENT
Engines that have been adjusted to operate at high
altitudes must be readjusted to operate properly at
altitudes below 2000 feet.
B
A
1. Start engine and run for several minutes to reach operat-
ing temperature.
2. Stop engine. Remove grommet cover (A) over “H” and “L”
limiter needles.
3. Start engine and turn the high-speed needle rich (CCW)
until the engine runs between 11,500 and 12,000 RPM.
Then turn the low-speed needle rich (CCW) until the en-
gine does not hesitate when accelerated.
DO NOT REMOVE LIMITER CAPS!
4. Idle Speed Adjustment.
• Turn “idle” speed adjustment screw (B) CW until the saw
chain begins to move, then turn the screw CCW until saw
chain stops moving. Turn screw CCW an additional 1/4
turn.
5. Accelerate to full throttle for 2-3 seconds to clear excess
fuel from engine then return to idle. Accelerate to full
throttle to check for smooth transition from idle to full
throttle. If engine stops or stalls after full warm up return
the unit to your authorized ECHO dealer for adjustment.
6. Install grommet cover (A) over “H” and “L” limiter needles.
HIGH ALTITUDE ADJUSTMENT
High altitude adjustment may be required for proper opera-
tion of this engine above 2000 feet.
1. Start engine and run for several minutes to reach operat-
ing temperature.
2. Stop engine. Remove grommet cover (A) over “H” and “L”
limiter needles.
3. Start engine and turn the HI speed needle lean (CW) until
the engine runs between 11,500 and 12,000 RPM. Then
turn the LO speed needle lean (CW) until the engine does
not hesitate when accelerated.
DO NOT REMOVE LIMITER CAPS!
4. Idle Speed Adjustment.
• Turn “idle” speed adjustment screw (B) CW until the saw
chain begins to move, then turn the screw CCW until saw
chain stops moving. Turn screw CCW an additional 1/4
turn.
5. Accelerate to full throttle for 2-3 seconds to clear excess
fuel from engine then return to idle. Accelerate to full
throttle to check for smooth transition from idle to full
throttle. If engine stops or stalls after full warm up return
the unit to your authorized ECHO dealer for adjustment.
6. Install grommet cover (A) over “H” and “L” limiter needles.
- Chain Saw 1
- Instruction Manual 1
- MODELS : CS-301 1
- Rules foR safe opeRation 2
- Contents 4
- assembled 6
- CS-301, CS-341 7
- WARNING ! ! 8
- WARNING 9
- GuaRD® to baR instRuCtions 9
- baR anD saw Chain-install/ 9
- , Chain tension 10
- IMPORTANT 10
- statement 10
- lubRiCant 11
- ColD enGine 12
- enGine is haRD to staRt 12
- waRm enGine 13
- CuttinG instRuCtions 14
- WARNING DANGER 15
- FELLING A TREE 15
- KICKBACK IS DANGEROUS 16
- stRaineR 18
- baR anD oil holes 19
- spaRk aRRestoR 20
- system CleaninG 20
- aDjustment 21
- SETTING THE SAW CHAIN 23
- CHAIN TYPE AND SPROCKET PITCH 23
- Table 1 24
- WARNING DANGER 25
- TESTING THE BRAKE 26
- INSTALLATION 26
- OPERATION 26
- 8:30 - 4:30 Mon - Fri C.S.T 28
- 400 OakwOOd ROad 28
- Lake ZuRich, iL 60047-1564 28
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