Chapter 6 Ignition; General Information; Operation; Components - Tecumseh TC 200 Technician's Handbook

GENERAL INFORMATION

All TC engines are equipped with a solid state ignition module mounted outside the flywheel.
system consists of a flywheel magnet, charge coil, capacitor, a silicon controlled rectifier, a pulse transformer, trigger coil,
high tension lead, and a spark plug. All components except the spark plug and high tension lead are located in an
encapsulated ignition module. The module is protected by epoxy filler from exposure to dirt and moisture. This system
requires no maintenance other than checks of the high tension lead and spark plug.

OPERATION

As the magnet in the flywheel rotates past the charge coil,
electrical energy is produced in the module. The energy is
stored in the capacitor (approx. 200 volts) until it is
released by an electrical switch (SCR). As the magnet
continues to rotate, it passes past a trigger coil where a
signal is produced. This low voltage signal closes the SCR
switch, allowing the energy stored in the capacitor to flow
to a transformer where the voltage is increased from 200
volts to 25,000 volts. This voltage flows along the high
tension lead to the spark plug where it arcs across the
electrodes and ignites the air-fuel mixture (diag. 6-1).

COMPONENTS

1. FLYWHEEL WITH MAGNETS
2. FLYWHEEL KEY
3. IGNITION MODULE
4. SPARK PLUG
5. IGNITION SWITCH

CHAPTER 6 IGNITION

3
4
The solid state ignition
2
1
5
6-1
6-2
21