Poulan 1600 User Manual - Page 16

C. CARBURETOR ADJUSTMENTS AWARNING Makecarburetoradjustmentswith the driveshafthousingsupported to preventthetrimmer line fromcontactinganyobject.Holdthetool with your hand. Do not use the optional shoulder strap for support. AWARNING Keep others away when making carburetor adjustments. AWARNING Seriousinjury totheoperatorandotherscanoccurif the carburetor is not properly adjusted. • The carburetor has been carefully adjusted at the factory However, the operator must be sure that adjustments are made when any of the following conditions occur: NOTE: Be sure to properly prepare the tool as described in "1. Preparation" before making any adjustments. - Enginewill not continue to runat idle position. See "2. IdleSpeed Adjustment"and "5. LowSpeed Mixture Adjustment." - Trimmer Head continues to spin when the engine idles. See "2. Idle Speed Adjustment" and "4. Deceleration Check:' - Engine dies or hesitates when it should accelerate. See "3. Acceleration Check." - Lossofcutting power whichcannot becorrected by cleaning the air filter. See "6. High Speed Mixture Adjustment." - Engine does not return to idle from full throttle within 2 seconds. See "4. Deceleration Check:' - Enginewill not run.See"TroubleShootingChart:' Then, ifthe carburetor requiresadjustment, begin with "7. Basic Carburetor Settings?' • This is a complicated task and it is important to follow instructions in sequence as indicated. • Very 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 screws. AWARNING The trimmer line will be spinning during most of this procedure. Wearyour protectiveequipmentandobserve all safety instructions. 16 1. PREPARATION a. Use a fresh fuel mix. See "Fueling Your Engine." b. Make sure the line extends to the length allowed by the line limiter to provide correct load on engine. c. Start the engine. Cut grass for 3 minutes to warm engine. The enginemust beatoperating temperature before carburetoradjustmmentscan beperformed correctly. d. Stopengineand removeair filterby pullingit outwith your fingers. Refer to "Specifications" for location. 2.IDLE SPEED ADJUSTMENT a. Allow engine to idle. b. Adjust IdleSpeed Screw (Figure23) until theengine continues to run without stalling and without the trimmer head moving. - Turn screw clockwise op•-ix to increase engine speed ifthe engine stalls or dies. - Turn screw counterclockwise a- to slow enginedownand/or tokeepthetrimmerlinefrom turning. c. Follow instructions in "3. Acceleration Check- and "4. Deceleration Check." d. No further adjustments are necessAry if the trimmer head does not turn at idle speed and if performance is satisfactory. AWARNING Recheck idle speed after each adjustment. The trimmer head must not turn at idlespeed toavoidseriousinjury to the operator and others. 3.ACCELERATION CHECK a. Allow engine to idle_ b. Squeeze Trigger fully. 1.) If performance issatisfactory, proceed to "4. Deceleration Check." 2.) If the engine does not accelerate smoothly, turn the Low Speed Mixture Screw (Figure 23) counterclockwise 40-isp a small amount (no more than the width of the slot in the adjusting screw). c. Repeat steps "b." until smooth acceleration is obtained. NOTE: It may be necessary to repeat "2. Idle Speed Adjustment" through "3. Acceleration Check," to obtain correct adjustments. d. Follow instructions in "4. Deceleration Check.-