valutazioni - 4, GPA: 4
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So normally, further adjustment is unnecessary. If readjustment is required, refer to the following instructions. CARBURETOR ADJUSTMENT The diaphragm carburetor has three external adjustments, and to some extent, the adjustment of each will affect the other two. It will be necessary, therefore, to readjust each until satisfactory performance is achieved. 1. Idle speed adjusting screw. This adjustment controls the throttle opening in the idle position. 2. Low (LO) speed needle screw. The low speed needle controls the volume of fuel/oil mixture at low engine speed It also controls the supplementary fuel required to obtain smooth progression from idling to high speed. 3. High (HI) speed needle screw. The high speed needle controls the volume of fuel/oil mixture at full throttle opening. Turn both 'HI' and 'LO' needles clockwise until fully closed. Do not use excessive force Unscrew the 'LO' needle one complete turn. Turn the idle speed adjustment screw clockwise until the throttle is slightly open. Start the engine and run for a few minutes on high idle until the engine is warm. Allow the engine to idle, and if necessary, readjust the idle speed screw to keep the engine from stalling. 'LO' SPEED ADJUSTMENT Turn the ‘L0‘ needle clockwise slowly and note the position at which the engine speed is reduced. Now turn the 'LO' needle counterclockwise and again note the position when speed is reduced Set the needle in the midway position Finally, adjust the engine idling speed by turning the idle speed screw in a clockwise direction until the clutch just begins to engage This indicates a speed of 3000-3400 RPM. Now reduce engine speed by turning the screw counter clockwise one half turn. Jl % HI' SPEED ADJUSTMENT Engine must be at normal operating temperature. Turn the 'HI' needle counterclockwise 1-1/4 turns. Run the engine at full throttle and turn the 'HI' needle slowly clockwise until the engine runs smoothly without "four stroking” on no load. Turn the needle open again (counterclockwise) 1/8 turn to obtain optimum fuel for full power under load conditions. CAUTION DO NOT RUN THE ENGINE ON FULL THROTTLE LONGER THAN 5-6 SECONDS TO AVOID DAMAGE TO ENGINE. MUFFLER AND EXHAUST PORT • Clean as necessary • Carbon deposit in cylinder exhaust port and muffler will reduce engine output — Muffler can be removed by taking off muffler cover — Be careful not to scratch cylinder or piston when cleaning cylinder exhaust port — Clean the spark arrester screen too. CYLINDER FINS • Check periodically. • Clogged fins will result in poor engine cooling. • Remove dirt and dust from between fins to let cooling air pass easily. Exhaust port Muffler cover Muffler *0 V Sr Screen 11 - TROUBLE SHOOTING Poor performance of the engine and/or trimming mechanism can normally be prevented by carefully following the above instructions. Poor performances can easily be corrected even by a beginner. When the engine does not function properly check the following three (3) positions first. • Is engine compression adequate? • Is fuel system in good condition and is enough fuel being supplied? • Is electrical system in good condition and is spark plug operating normally? When there is serious trouble of the next chart with the unit, do not try to repair it yourself but have your distributor or dealer do it for you. For detailed TROUBLE SHOOTING refer to tables 1 and 2. Locate the problem on the following charts and repair as necessary. Table 1 * £ a o g> In s? v 4) re "D “ 8 •— c w 9> o -2 vi ^ ? C «- £ — Covered with carbon............. Clean or replace. — Fouled with fuel................... Clean or replace. Starting Procedures............... correctly. incorrect Low a...
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