Echo CS-310 Operator's Manual

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Echo CS-310 Operator's Manual Manual pdf 29 page image

CS-310 MAINTENANCE© 11/2014 ECHO Inc.X7503274200 29Carburetor AdjustmentEvery unit is run at the factory and the carburetor is set incompliance with Emission Regulations. In addition, thecarburetor is equipped with “H” (High Speed) and “L” (LowSpeed) needle adjustment limiters that prevent settingsoutside acceptable limits.Engine Break-InNew engines must be operated a minimum duration of twotanks of fuel break-in before carburetor adjustments can bemade. During the break-in period your engine performancewill increase and exhaust emissions will stabilize. Idle speed can be adjusted as required.High Altitude OperationThis engine has been factory adjusted to maintain satisfactory starting, emission, and durabilityperformance up to 1,100 feet above sea level (ASL) (96.0 kPa). To maintain proper engine operation andemission compliance above 1,100 feet ASL the carburetor may need to be adjusted by an authorized ECHOservice dealer.If the engine is adjusted for operation above 1,100 feet ASL, the carburetor must be re-adjusted whenoperating the engine below 1,100 feet ASL, otherwise severe engine damage may result.1. Before adjusting carburetor clean or replace air filter and muffler “Spark Arrestor Screen”.2. Make sure the bar and chain are properly adjusted.3. Start engine and run several minutes to bring to operating temperature. Flash choke twice duringwarm-up to clear any air from the fuel system.4. Stop engine. Turn “H” speed needle counterclockwise (CCW) to stop. Turn “L” speed needle midwaybetween full clockwise (CW) stop and CCW stop.5. Idle Speed Adjustment:• Start engine, turn “Idle” speed adjustment screw “T” CW until the saw chain begins to move, then turnscrew out CCW until the saw chain stops moving. Turn screw out, CCW, an additional 1/4 turn.When carburetor adjustment is completed, the saw chain should not move at idle, otherwiseserious personal injury may result.6. Accelerate to full throttle for 2 - 3 seconds to clear any excess fuel in the engine, then return to idle.Accelerate engine to full throttle to check for smooth transition from idle to high speed. If engine hesitatesturn “L” needle CCW 1/8 turn and repeat acceleration. Continue adjustment until smooth accelerationresults.7. Check idle speed and reset if necessary as described in item 5. If a tachometer is available idle speedshould be set to value listed on technical data page.When starting, idling adjustment speed should be adjusted to prevent the saw chain from moving.When you experience trouble with the carburetor, contact your dealer.TL H