4 - 36 Genie S-80 & Genie S-85 Part No. 34032Service Manual - First EditionSection 4 - Scheduled Maintenance Procedures3 Load the system by pressing the boom retractswitch, then move the engine idle controlswitch to high idle (rabbit symbol).4 Adjust the high idle adjustment screw to obtainan air-to-fuel mixture ratio of 13.0:1 to 13.2:1,using an exhaust gas analyzer.Preliminary setting is 1 /4 inch ofthreads showing. Measure fromtop of lock nut to top ofadjustment screw.If an exhaust gas analyzer is notavailable, adjust to obtain peak oroptimum rpm.5 Hold the adjustment screw and tighten thelock nut.6 Move the engine idle control switch to low idle(turtle symbol) and adjust the low idle screw toobtain an air-to-fuel mixture ratioof 13.0:1 to 13.2:1.a low idle mixture adjustment screwPreliminary setting: turn low idleadjustment screw clockwise allthe way in. Turn low idleadjustment screwcounterclockwise 2 3 /4 turns.C-14Check and Adjust the Air/LPGMixture - Gasoline/LPG ModelsMaintaining the proper air-to-fuel mixture duringLPG operation is essential to good engineperformance.Engine fuels are combustible.Perform this procedure in anopen, well-ventilated area awayfrom heaters, sparks, flames andlighted tobacco. Always have anapproved fire extinguisher withineasy reach.The engine rpm needs to bepreset for gasoline fuel operationbefore adjusting the LPG idlemixture. Refer to B-12, Check andAdjust the Engine RPM.The engine should be warmed tonormal operating temperaturebefore performing this procedure.1 Move the fuel select switch to LPG fuel andstart the engine from the ground controls.2 Loosen the high idle mixture adjustmentlock nut.a high idle mixtureadjustment screwTABLE C PROCEDURESaa
