Rotax MMH-912 Series - Section 74 Ignition System

Effectivity 912/914 Series
Edition 1 / Rev. 3
74-00-00
page 1
October 01/2010
d04778
BRP-Powertrain
Maintenance Manual
SECTION 74
IGNITION SYSTEM
1) Table of contents
SECTION 74
IGNITION SYSTEM
1) Table of contents ....................................................................................74-00-00 / 1
2) Systems description ................................................................................. 74-00-00 / 3
2.1.) Electric system (alternators, ignition) ............................................74-00-00 / 3
2.1.1) Ignition ..................................................................................74-00-00 / 6
2.1.2) Allocation of trigger coils and ignition circuits ....................... 74-00-00 / 8
2.1.3) Firing order ...........................................................................74-00-00 / 9
2.1.4) Ignition cables .......................................................................74-00-00 / 9
2.2) Connections for instrumentation ...................................................74-00-00 / 9
2.2.1) Electronic rev counter ...........................................................74-00-00 / 9
3) Maintenance / troubleshooting ...............................................................74-00-00 / 11
3.1) Treatment of corrosion and surface damage ................................74-00-00 / 11
3.1.1) Electric system......................................................................74-00-00 / 11
3.2) Checking the ignition unit, trouble shooting................................... 74-00-00 / 11
3.3) Spark plugs ...................................................................................74-00-00 / 12
3.4) Spark plug connectors and ignition cables ....................................74-00-00 / 12
3.5) Electronic module, trigger coil kit ..................................................74-00-00 / 14
3.6) Charging coil .................................................................................74-00-00 / 15
3.7) Generator coils.............................................................................. 74-00-00 / 16
3.8) Dual ignition coil ............................................................................74-00-00 / 17
3.9) Cut-in speed of ignition .................................................................74-00-00 / 18
3.10) Ignition timing control ....................................................................74-00-00 / 19
3.11) Ignition circuits inspection (ignition check) ....................................74-00-00 / 21
3.12) Measurement values for the ignition unit ......................................74-00-00 / 22
3.13) Wiring diagrams ............................................................................74-00-00 / 24
3.13.1) Engine internal (on the 912 Series) ......................................74-00-00 / 24
3.13.2) Engine internal (on the 914 Series)......................................74-00-00 / 30
3.13.3) Engine external (on the 914 Series) .....................................74-00-00 / 34
3.14) Ignition electric set removal ...........................................................74-00-00 / 35
3.15) Ignition electric set dismantling .....................................................74-00-00 / 37
3.15.1) Dual ignition coils replacement .............................................74-00-00 / 37
3.16) Ignition electric set reassembly ....................................................74-00-00 / 41