Kohler K91 Service Manual page 71

ELECTRICAL SYSTEMS AN D COMPON EN TS
IGNITION SYSTEMS
Koh ler K series engines are fitted with one of three
types of ignition systems . each avai lable in several
d ifferent version s . Most parts in one system are
not interchangeable with parts from another sys­
te m . Care should be taken in selection of replace­
ment parts to ensure the right parts are used . The
three types of systems and their available versions
are:
Magneto I g n ition System
1 .
Magneto rotor type; ignition only
2. Magneto flywheel type ( magnet rin g ; ignition
only)
3 . M ag neto flyweel type with 3 Amp l ighting coils
Mag neto flywheel type with 1 0 Amp alternator
4 .
Battery Ignition Syste ms
1 .
Battery ig n ition with motor generator
Battery ig nition with 1 0 Amp alternator
2 .
SECTION 8
8-1 .
Figure Magneto Cyc le Showing Flux Reve rsal.
Battery ig nition with 1 5 Amp alternator
3 .
Battery ignition with 30 Amp alternator
4 .
Breakerless I g n ition System
1 .
Breakerless ignition with 1 0 Amp alternator
Breakerless ignition with 1 5 Amp alternator
2 .
Magneto Ignition System Operation
I n all magneto i gn ition system s . high-strength per­
manent magnets provide the energy for ignition . In
rotor type systems . the magnet is pressed onto
the crankshaft and is rotated inside a coil-core
assembly (stator) mounted on the bearing plate .
In the other systems . a perma nent magnet ring on
the i nside of the flywheel revolves a round the sta­
tor. Movement of the magnets past the stator in­
d uces electric current flow i n the stator coil ( and
in alternator and lighting coils if provided ) . The
mag nets are mounted with alternate North and
South poles so that the direction of mag netic flux
constantly changes . producing an alternating cur­
rent ( AC) in the stator coil windi ngs . Refer to Fig­
ure 8- 1 .
(STATOR)
8 . 1