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    UF4D13E0.book  Page 66  Wednesday, March 15, 2017  11:08 AM

                                                                                 Maintenance

                            sary  technical knowledge, poor engine
                            performance and damage may result.
                            The carburetor is a vital part of the engine and
                            requires very sophisticated adjustments.
                            Most adjustments should be left to a Yamaha
                            dealer who has the professional knowledge
                            and experience to make them.
                            However, the operator may adjust the engine
                            idling speed as part of the usual maintenance
                            routine.
                            EJU34472
                            Adjusting the engine idling speed
                            (1) Place the watercraft in the water.
                            (2) Start the engine and warm it up for 1 to 2
                                minutes.
                            (3) While  using a diagnostic tachometer,
                                turn the throttle stop screw to adjust the
                                engine idling speed to specification. Turn
                                the throttle stop screw clockwise to in-
                                crease the engine idling speed or coun-
                                terclockwise to decrease the engine
                                idling speed.

                              1 Throttle stop screw
                              Engine idling speed:
                                1300 ±50 r/min

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