mxu 400 Werkstatthandbuch : Seite 18

                         Spark Plug                                    Muffler/Spark Arrester

A light brown insulator indicates that a plug is correct.   At the intervals shown in the Periodic Maintenance
A white or dark insulator indicates that the engine may     Chart, clean the spark arrester using the following pro-
need to be serviced or the carburetor may need to be        cedure.
adjusted. To maintain a hot, strong spark, keep the
plug free of carbon.                                                        ! WARNING
                                                            Wait until the muffler cools to avoid burns.

                                                             1. Remove the cap screws securing the spark arrester
                                                                assembly to the muffler; then loosen and remove
                                                                the arrester.




                                                 ATV-0051

                 ! CAUTION
Before removing a spark plug, be sure to clean the
area around the spark plug. Dirt could enter engine
when removing or installing the spark plug.
                                                                                                             KC154A
Adjust the gap to 0.7-0.8 mm (0.028-0.032 in.) for           2. Using a suitable brush, clean the carbon deposits
proper ignition. Use a feeler gauge to check the gap.           from the screen taking care not to damage the
                                                                screen.
                                                             NOTE: If the screen or gasket is damaged in any
                                                            way, it must be replaced.

                                                             3. Install the spark arrester assembly with gasket;
                                                                then secure with the cap screws. Tighten to 48
                                                                in.-lb.




                                                ATV0052C
When installing the spark plug, be sure to tighten it
securely. A new spark plug should be tightened 1/2
turn once the washer contacts the cylinder head. A
used spark plug should be tightened 1/8 - 1/4 turn once
the washer contacts the cylinder head.

                                                                                                              KC145




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