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30 X7531125902
© 11/2015 ECHO Inc.
MAINTENANCE PB-760 LN H/T
Note: Every unit is run at the factory and the carburetor is set in compliance with emission regulations.
Carburetor adjustments, other than idle speed, must be performed by an authorized ECHO dealer.
Idle Adjustment
Before adjustment make sure that:
• Air filter is clean and properly installed.
• Spark arrestor screen and muffler are free of carbon.
• Blower pipes are installed.
1. Start engine, run at idle for one minute.
2. Complete warm up by running at full throttle for 5 minutes,
operating choke twice to clear air from carburetor chambers.
3. Check idle speed and reset if necessary. If a tachometer is
available, idle speed screw (A) should be set to the
specifications found on “Specifications” Page of this manual.
Turn idle screw (A) clockwise to increase idle speed; counter
clockwise to decrease idle speed.
Throttle Cable Adjustment (PB-770T only)
Level 1
If engine idle speed changes when blower pipe is moved, or engine will not reach full wide open throttle
speed, adjust throttle cable.
1. Loosen handle adjustment knob (C) and tilt Tube Throttle
handle forward to expose Adjustment Screw (D).
2. Turn Adjustment Screw until Throttle Trigger free play is
4-6mm (3/16-1/4 in.).
3. After adjustment, squeeze and release Throttle Trigger
several times to verify Carburetor Throttle Shaft has full
range of movement from idle to wide open throttle positions.
A
C
D
4-6 mm
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