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5-10 3. With all switches in the RUN position, the meter must read resistance (closed). If the meter reads no resistance (open), proceed to testing Emergency Stop/Throttle Switch, Carburetor Safety Switches, and Ignition Key Switch. EMERGENCY STOP/ 1. If the meter read no resistance (open) in the previ- ous test, locate the wiring harness coming from the emergency stop/throttle switch assembly. 2. Disconnect the three-wire connector. Using an ohmmeter, connect one meter lead to the black wire and the other meter lead to the black/red wire in the connector. 3. With the emergency stop knob, located on top of the throttle control, in the ON (pulled up) position and the throttle lever compressed, the meter must read resistance (closed). 4. If the meter reads no resistance (open) and the lever/control housing free-play is correct, replace the throttle switch. 5. If the meter reads resistance (closed) but the engine will not start, with the ohmmeter leads still connected, alternately release and compress the throttle lever; then move the emergency stop knob down and up. 6. The meter must read no resistance (open) when the throttle lever is released and the emergency stop knob is in either the UP or the DOWN position. 7. If the meter reads resistance (closed), replace the throttle switch. 8. Connect one meter lead to the black/red wire and the other meter lead to the black/white wire. 9. With the throttle lever released (idle position) and the emergency stop knob in the DOWN position, the meter must read no resistance (open). 10. If above tests were good, proceed to testing Carbu- retor Safety Switches and Ignition Key Switch. CARBURETOR SAFETY SWITCHES 1. If the meter read no resistance (open) in the previ- ous test, disconnect the carburetor safety switches one at time and test for a closed circuit. 2. Attach the two ohmmeter leads to the two leads coming from each carburetor switch. The meter must read resistance (closed). 3. If the meter reads no resistance (open), the switch must either be adjusted or replaced (see Synchro- nizing Carburetor Safety Switches in this sub-sec- tion). If the meter reads resistance (closed), proceed to testing Ignition Key Switch. IGNITION KEY SWITCH 1. If the meter read resistance (closed) in the previ- ous test, disconnect the ignition key switch con- nectors and connect the ohmmeter leads to each of the leads from the switch. 2. With the key switch in the OFF position, the meter must read resistance (closed). If the meter reads no resistance (open), replace the switch. SYNCHRONIZING CARBURETOR Before synchronizing the carburetor safety switches, check to make certain the carburetor idle speed screws are adjusted equally and the piston valves are synchro- nized. The carburetor safety switches affect ignition spark at idle only. If ignition spark problems are observed at partial or full-throttle positions, the prob- lem is not with the carburetor safety switches. NOTE: There must be 0.75-1.5 mm (0.030-0.060 1. Inspect the cable free-play gap between the throt- tle lever and the control housing at idle. Adjust the throttle cable swivel adapter at the top of each car- buretor for 0.75-1.5 mm (0.030-0.060 in.) cable free-play gap between the throttle lever “nibs” and the control housing. While observing if there is any cable free-play gap, apply slight pressure to the throttle lever to take up any cable slack that may be present. However, do not apply enough pressure to actually raise the carburetor slides dur- ing this adjustment. After cable free-play is prop- erly adjusted, tighten the jam nut on each carburetor securely. 0741-518 2. To determine which switch needs adjusting, dis- connect both carburetor safety switches from the main wiring harness connector. 3. Connect a digital ohmmeter to one carburetor safety switch connector; then compress the throttle lever while observing the meter reading and mea- sure the gap between the throttle lever and control housing at the moment the meter reading changes from open to closed. Repeat this step for the other carburetor safety switch. |