Poulan HDR500E User Manual - Page 18

SERVICE AND ADJUSTMENTS ENGINE TO ADJUST THROTTLE CONTROL CABLE (See Fig. 29) ---•-to-o-sen-cable-cl-arnirscre-w-to-allowntil to rnove7-----" • Move throttle control lever on upper handle to "FAST" position. • Pull throttle cable out until engine bellcrank is back as far as it will go. • Hold cable in this position and tighten clamp screw securely. THROTTLE CABLE CLAMP SCREW • V BELLCRANK FIG. 29 TO ADJUST CARBURETOR (See Fig. 30) The carburetor has a high speed jet and has been preset at the factory and adjustment should not be necessary. However, minor adjustments may be required to compensate for differences in fuel, temperature, altitude or load. If the carburetor does need adjustment, proceed as follows. In general, turning the idle needle valve in (clockwise) decreases the supply of fuel to the engine giving a leaner fuel/air mixture. Turning the needle valve out (counterclockwise) increases the supply of fuel to the engine giving a richer fuel/air mixture. IMPORTANT: DAMAGE TO THE NEEDLES AND THE SEATS IN CARBURETOR MAY RESULT IF SCREWS ARE TURNED IN TOO TIGHT. PRELIMINARY SETTING • Air cleaner assembly must be assembled to the carburetor when making carburetor adjustments. • Be sure the throttle control cable is adjusted properly (see above). • With engine off, turn idle needle valve in (clockwise) closing it finger tight and then turn valve out (counterclockwise) 1-1/2 turns. FINAL SETTING • Start engine and allow to warm for five minutes. Make final adjustments with engine running at idle and drive control bar in "DISENGAGED" position. -With-threttle control lever-in-`SLOW' position-,turn-'Idle needle valve in (clockwise) until engine begins to die then turn out (counterclockwise) until engine runs rough. Turn valve to a point midway between those two positions. IDLE RPM ADJUSTMENT • To adjust idle RPM, rotate throttle linkage counterclockwise and hold against stop while adjusting idle speed adjusting screw to obtain 1750 RPM. Release throttle linkage. ACCELERATION TEST • Move throttle control lever from "SLOW" to "FAST" position. If engine hesitates or dies, turn needle valve out (counterclockwise) 1/8 turn. Repeat test and . continue to adjust, if necessary, until engine acceler- ates smoothly. High speed stop is factory adjusted. Do not adjust or damage may result. IMPORTANT: NEVER TAMPER WITH THE ENGINE GOVERNOR, WHICH IS FACTORY SET FOR PROPER ENGINE SPEED. OVERSPEEDING THE ENGINE ABOVE THE FACTORY HIGH SPEED SETTING CAN BE DANGEROUS. IF YOU THINK THE ENGINE-GOVERNED HIGH SPEED NEEDS ADJUSTING, CONTACT YOUR NEAREST AUTHORIZED SERVICE CENTER/ DEPARTMENT, WHICH HAS THE PROPER EQUIPMENT AND EXPERIENCE TO MAKE ANY NECESSARY ADJUSTMENTS. THROTTLE LINKAGE THROTTLE STOP 0 IDLE SPEED ADJUSTING SCREW IDLE NEEDLE VALVE FIG. 30 18