Poulan 1600 User Manual - Page 17

4.DECELERATION CHECK a. Allow engine to idle, then squeeze Throttle Trigger fully. b. Allow engine to run at full speed for about I second. c. Release the Throttle Trigger to the idle position and listen to the deceleration of the engine. It must return to idle smoothly and within 1 to 2 seconds. 1.)If performance is satisfactory; proceed to step 2 .)If the engine slowly or erratically returns to idle or idles erratically, repeat "2. Idle Speed Adjustment" or continue through Low Speed Mixture and High Speed Mixture Adjustments to obtain proper deceleration. d. Recheck idle speed. 5. LOW SPEED MIXTURE ADJUSTMENT a. Allow engine to idle. b. Turn the Low Speed Mixture Screw (Figure 23) slowly clockwise rib, until the speed starts to drop. Note this position. c. Turn the Low Speed Mixture Screw counterclockwise A-Nie until the speed increases and then starts to drop again. Note this position. d. Set the Low Speed Mixture Screw at the mid-point between the two positions. e. Follow instructions in "3. Acceleration Check" and "4. Deceleration Check?" HIGH SPEED MIXTURE SCREW Dry IDLE • LOW SPEED SPEED MIXTURE SCREW SCREW AIR FILTER (removed) I Figure 23 6.HIGHSPEEDMIXTURE ADJUSTMENT CAUTION: Do not operate engine at full throttlefor prolonged periodswhile makinghigh speed adjustments as damage to the engine can occur. a. Support thedriveshaft housing sothe trimmer line is off the ground and will not make contact with any object. b. Allow engine to idle, then squeeze Throttle Trigger fully. NOTE: Perform steps "c?' through "e.", at full throttle. c. Turn High Speed Mixture Screw (Figure 23) very slowly clockwise -4 until engine speed is reduced. d. Turn High Speed Mixture Screw very slowly counterclockwise . Stopwhentheenginejust begins to run rough. e. Turn the screw slowly the minimum amount clock- wise until the engine runs smoothly. f. Follow instructions in "3. Acceleration Check" and "4. Deceleration Check!' CAUTION: If the engine does not operate accordingto theseinstructionsafter repeatingthe adjusting steps, do not use the tool. Take it to a qualified service dealer. 7.BASIC CARBURETOR SETTINGS a. Turn the Low Speed Mixture Screw and the High Speed Mixture Screw(Figure23)clockwise 4,-* just until they stop. Do not turn thescrewsuntil they are tight as damage to the needle seats can occur. b. Turn the Low Speed Mixture and High Speed Mixture Screws one full turn counterclockwise ez-e. c. Follow instructions "1. Preparation," through "6. High Speed Mixture Adjustment" 8. REINSTALL AIR FILTER Be sure filter is clean. See "Air Filter" for instructions. CAUTION: Fit air filter into the corners of the housing to keep dirt from entering the engine and causing engine damage. D. AIR FILTER A dirty air filter decreases the life and performance of the engine and increases fuel consumption. Clean the Air Filter: • Alwaysafter 5tanksoffuel or 5hoursofoperation, whichever is less. • More frequently, in dusty conditions. 1. Pull the Air Filter from the engine with you fingers. For Air Filter location, see "Specifications:' 2. Wash in soap and water. CAUTION: Do not clean the air filter in gasoline or other flammable solvent to avoid creating a fire hazard. 3. Squeeze dry and replace. CAUTION: The air filter must be fitted into thecornersof the housing toavoid enginedamage. 17