![]() After setting governed idle, in the next step it is time to set the non-governed idle. While the engine is running at lowest speed bend the idle RPM tab to set governed idle at a designated RPM position. It is also recommended to firstly identify carefully the position of LOW speed RPM as well as HIGH speed RPM adjusting screws, once done with this next step identify the corresponding HIGH and LOW RPM adjustments accordingly to microfiche card 30, the computer parts looking system or servicing bulletin #107 for rotary movers. Now, as per the recommended RPM you can easily adjust the LOW and HIGH speed screws. One of the most important things to do is to ensure correct RPM adjustments. Reconfirm the LOW RPM and HIGH RPM settings and make adjustments as required. Repeat it until the engine continues to idle smoothly. Carefully turn up idle mixture screw about 1/8 turns either in clockwise or opposing out in the cocounter-clockwise direction in case the engine is not idling properly/smoothly. Gradually move the speed control to the IDLE position or the SLOW position once the main mixture is set properly. During an event of the engine stoppage or in case engine hesitates while engaging the load, carefully set the main mixture adjustment screw out to counterclockwise 1/8 turn at a time, simultaneously testing out each and every setting with the equipment in load, awaiting this condition to be corrected.įor excessively smoking engines, (rich) turn at the time, in the clockwise direction turn the main adjustment screw, remember just 1/8 turn at one time and simultaneously test every adjustment setting done with equipment under the load, until the condition when it is corrected completely. To put the engine under the load condition, carefully engage cutter deck, impeller and various other driven parts. Be cautious and keep your body parts, hands, hair, clothes, and accessories at a distance from all the moving parts. There can be some really severe injuries resulting from rotating parts. If it is necessary, the main adjustment can be done with the engine in a loaded condition.Ĭaution: It has been advised to never operate the engine after removing the covers and guards. Set down the speed controlling carefully to the IDLE position or to the SLOW position, precisely check for an appropriate IDLE or SLOW pace RPM and at that particular point the idle mixture screw need to be adjusted and in the same way as the main mixture screw. Now to find out best setting point, turn screw to the clockwise direction towards midway between these two positions and that would indicate best setting point adjustment. Repeat the same in reverse direction and now turn the adjusting screw out in counterclockwise direction until the engine reaches a point from where it begins to run in an erratic manner. Once the engine picks up the speed and high or fast speed has been set, it is then advisable to turn on the main mixture adjusting screw to the clockwise slowly-slowly till the point when engine begins to run inconsistent and note down carefully the position of screw at this point of time. Upon starting the engine, initially allow the engine to warm up to a normal working temperature. The adjustments for both the system are pretty much the same however, the drops off point indicate may not be as noticeable. For air adjust system, long needle is used and for fuel adjustments the short ones are used. Different types have diverse style of idle adjustments the series 1 carburetor comes with two varying styles of adjusting needle for the idle. ![]() Note: Some models may have fixed main jet feature characterized by the absence of adjusting screws that gives a clear indication of a fixed jet that requires no adjustment. After that, slowly back out the screws in a counterclockwise direction to the pre-set position. Turn screws adjusting both idle and main mixture in (clockwise) finger tight, however over tightening the screws may partially or entirely damage the tapered portion of the needle.
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