KTM SEM ignition

 

SEM ignition that fitted KTM400LC4 – 1996 to 2002

Flywheel and stator on right side of the bike.

right side
 

Oscillogram.

red charging coil = 200Vac
green pickup coil = +/-6Vac
black frame ground
yellow lighting coil
blue lighting coil

Cliquer sur les fils

yellow= 12Vac 12Vac green= pickup green= pickup red= charging coil red= charging coil red= charging coil

Click on wire to visualize the signal available on this wire, when the engine idles…

Pictures

Inside the stator

ZoomZoom

Thanks to Zoli Bihari

Stator.

Resistances map.

OHMs Red green black yellow blue
red 1777 1754
green 1777 23
black 1754 23
yellow 0,2
blue 0,2

Until 1998 pickup coil (green – black) was 23ohm. After it’s: 165ohm.

Ignition coil

It’s not a simple coil! There are some electronics inside…

The “black box” is part of the coil:

red charging coil = 200Vac
green pickup coil = +/-6Vac
black frame ground
orange handelbar kill switch

Schematic.

Orange “BLACK BOX” from a KTM 620LC4 – 1997

 

Synchronization.

  • Pickup and Spark Signal at 1460RPM.
  • Pickup and Spark Signal at 2880RPM.
  • Pickup and Charge voltage at 1770RPM.
  • Pickup and Charge voltage at 2370RPM.

 

Notes.

LC4 kickstart Ignition coil with SEM before 1999
+ Pole – pole measurement
Coil red black 47k
red green 47k
red orange 0 Ohm
black ignition lead 2,0KOhm / + – 0.3K
Stator black red 1,7kOhm
black green 23Ohm + – 5 Ohm
red green 1,7kOhm
yellow / yellow blue 0,2Ohm
————————————————-
LC4 kickstart Ignition coil with SEM (ignition coil) after 1998
+ Pole – pole measurement
Coil red black 47k
red green 47k
red orange 0 Ohm
black ignition lead 2,0KOhm / + – 0.3K
Stator black red 1,7kOhm
black green 165Ohm + – 20 Ohm
green red 1,7kOhm
yellow yellow 1Ohm
————————————————–
LC4 electric start with KOKUSAN
Impulse transmitter coil red green 100ohm + -20%
Stator black / red red / white 12,7ohm + -20%
loading coil mass / yellow 0,65ohm + -20%
loading coil white / yellow 0,16ohm + -20%
————————————————–
LC4 kickstart with KOKUSAN super comper 1999-2003
Impulse transmitter coil white green 60 -120ohm
stator red / black-yellow 0.45 – 0,56ohm
Stator black / red and red / black 0.45 – 0,56ohm
————————————————–
Ignition coil KOKUSAN
Primary blue / white – mass 0,45 – 0,56ohm
secondary blue / white – zundkabel 0.45 – 0,56ohm
————————————————-

4 Comments on "KTM SEM ignition"

  1. I have a 87 LC4 580 KTM Require SEM Ignition Coil CAN YOU PLEASE HELP ME ! Mobile 0429491359

  2. Roel Vollaard | 26 May 2017 at 12 h 02 min | Reply

    I’ve a KTM GS620 SC from 1996 with a kickstarter, it is a 4T . Who can give a suggestion or has already experience which CDI published on transmic.net is usable for this engine?

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