RD 12 / RD 12A Vibration System and Steeringwc_tx000668gb.fm 576.1 Checking the Engine Speed and Vibration SpeedPrerequisites Vibrotach Vibration must turn onProcedure Follow the procedure below to check the engine rpm and drum vpm.1. Start the engine and place the throttle switch in the FAST position.2. Measure the engine rpm using a vibrotach.3. Measure the vpm (vibrations per minute) by placing the vibrotach on the rim ofthe drum while vibration is on.4. If the vpm is not 4150–4250, adjust the throttle screw (a) until it is.The procedure to check the engine rpm and drum vpm is now complete.
