Briggs & Stratton 276535, Repair Manual

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2-Cycle Snow Engine
Section 1 - General Information
Page 2
port. As it continues, it compresses the fuel mixture in
the combustion chamber (Item
Figure 4).
Fig. 4
IGNITION COIL OPERATION
The ignition coil system (Item Figure 5) is
breakerless and contains electronic components that
replace mechanical points and related accessories (such
as a breaker cam, spark advance assembly, etc.).
Fig. 5
As the flywheel magnet passes the ignition coil module,
an AC voltage is induced into the charge coil. This AC
voltage is converted by a rectifier into a DC signal, which
is then stored in a capacitor
(Figure 6).
Fig. 6
When the silicone-controlled rectifier (SCR) is triggered,
up to 200 volts DC, stored in the capacitor, travels to the
spark coil. Here it is stepped up to as much as 25,000
volts and is discharged across the electrodes of the
spark plug
(Figure 7).
Ignition timing (when the SCR is triggered) is determined
by the flywheel magnet and the keyways in the flywheel
and crankshaft. Damage to any of these parts will affect
the ignition timing.
Fig. 7
Intake Ports Closed
Compression
Third Port Closed
Partial Vacuum
Ignition Coil Module