User manual TORO MOTOR 2-CYCLE GTS 120

[. . . ] 2-CYCLE GTS 120 ENGINE SERVICE MANUAL Table of Contents ­ Page 1 of 1 PREFACE I. GENERAL INFORMATION SAFETY INSTRUCTIONS MAINTENANCE MODEL AND SERIAL NUMBERS TWO-CYCLE ENGINE THEORY AND OPERATION CARBURETOR THEORY AND OPERATION SPECIAL TOOLS LIST II. MAINTENANCE AIR CLEANER SPARK PLUG EXHAUST SYSTEM DECARBONING CYLINDER HEAD IGNITION TIMING (MODEL 47PZ2 ONLY) IGNITION TIMING (DIAL INDICATOR) CONTACT POINTS AND CONDENSER MODEL47PZ2 ONLY IGNITION COIL GOVERNOR GOVERNOR OPERATION FUEL TANK CARBURETOR STORAGE III. TROUBLESHOOTING AND TEST PROCEDURES PRELIMINARY TROUBLESHOOTING ENGINE BRAKE AND IGNITION SWITCH BBC APPLICATIONS FUEL TANK TESTING COMPRESSION CRANKCASE ENGINE TROUBLESHOOTING CHART IV. [. . . ] The engine speed will drop until once again the flyweight and return spring are in balance (Figure 2-1 3). Figure 2-15 FUEL TANK ! 1 CAUTION: The gasoline in the tank explosive. from and smoke when fuel vapors are present. Figure 2-13 Models 47PD3, 47PE4 and 47PF5 are equipped with variable throttles. The linkage is described in (Figure 2-1 A mounting boss wasadded tothe 4). The boss does not exist on model 47PZ2 engines therefore thevariable throttle linkage will not retrofit. Model 47PF5 engines will include a weld stud on governor linkage for the ease of reassembly (See Figure 2-1 5). For the engine and carburetor to function properly the fuel supply must be clean. Stale, dirty and improperly mixed fuel will cause starting and running difficulties. To assure a clean fuel supply the fuel tank may be removed and flushed with fresh fuel. A (See Disassembly Instruction. ) non-replaceable sintered bronze fuel filter is insetinto the fuel tank outlet. In some cases, the filter can be cleaned by back flushing with solvent or by blowing low pressure compressed air through the fitting on the bottom of the fuel tank. Commercial engines have a replaceable inline fuel filter located between the fuel tankandcarburetor. The replacementfuelfilter is Toro Part Number 56-6360(Figure 2-16). Remove fuel any foreign materials which may plug thevent. The gasket inside the cap may be removed to permit further cleaning of the vent area. Fuel Cap Governor Spring Governor Arm Fuel Filter (molded intolank). Inline Fuel Filter Part No. 56-6360 Figure 2-14 Figure 2-16 11-5 CARBURETOR The non-adjustable carburetor has a number of small orifices which control the flow of fuel and air to obtain the proper combustable mixtures. If stale or dirty fuel enters the carburetor, deposits can causing form adverse changes this to cornbustable mixture. (See Disassembly Instructions. ) Soak all metal parts in carburetor cleaner to remove deposits. THE BOWL SEAL, FLOAT AND NEEDLE VALVE SHOULD NOT BE CLEANED WITH CARBURETOR CLEANER OR DAMAGE RESULT. MAY Replace any damaged or questionable components before reassembly (Figure 2-1 7). PilotJet out insulators or heat deflectors. This model may be fitted withheat shield kit a number 81 -221to 0 prevent hot restart problems. Engine Model 47PD3, 47PE4, 47PF5 Carburetor Standard Main Jet ToroPart No. 81-2340 Float Pivot Pin Needle Valve Figure 2- 18 STORAGE Drainthe gasoline from thefuel tank. After the gasoline is drained, start the engine andlet it run until all fuel expended. Move is the recoil starter a number of timesto assure all fuel is expended. All gasoline must be removed to prevent gumlike varnish deposits from formingin the fuel system. Clean area around the plug to prevent dirt from entering the cylinder when the plug isremoved. [. . . ] Use to 10 the starter cup wrench to hold the flywheel from turning and tighten the' retaining nut on the end of crankshaft to 4-5 Kg-m (29-36f3-lb). Use the air gap gauge listed in the Special Tools Section and adjust the air gapbetween the flywheel and ignition coil laminations to . 5 mm (. 020 in) maximum. Attach the engine to the mower chassis and install the blade components to the engine 14. Install the through-bolt, nuts and lock washers on the muffler and tighten to the recommended torque. [. . . ]