General Information; Armatures; Armature Testing - All Models - Briggs & Stratton Twin Cylinder L-Head Repair Manual

SPECIFICATIONS FOR ALL OPPOSED TWIN CYLINDER ENGINE MODELS
Basic
Model Series
400000, 460000
BREAKER POINT IGNITION CONTACT POINT GAP: .020" (.51 mm)
See Section 1 For Spark Plug Maintenance and Specifications

GENERAL INFORMATION

Briggs & Stratton Twin Cylinder engines use two types
of flywheel ignition systems:
1. Magnetron – Two versions of armatures have
been produced, NO TAG.
a. The composite type is a self-contained arma-
ture with transistor module.
b. Earlier versions have a replaceable Magne-
tron transistor module mounted on the ignition
armature.
The composite style Magnetron armature must be
replaced as an assembly.
The Magnetron module can only be installed on
armatures originally equipped with Magnetron
module.
2. Twin cylinder engines with type number below
0500, were equipped with a flywheel magneto sys-
tem consisting of an ignition armature and external
breaker points and condenser mounted under a
breaker box, NO TAG.

ARMATURES

Armature Testing – All Models
The condition of the ignition armature can be accurate-
ly diagnosed using ignition tester, Tool #19368, as
described in "Troubleshooting" in Section 1.
2
2
Armature
Air Gap
With Magnetron
.008" to .012"
(.20 to .30 mm)
With Breaker Points
.010" to .014"
(.25 to .36 mm)
CONDENSER CAPACITY: .18 TO .24 M.F.D.
Flywheel Nut Torque
Flywheel Puller
Part No.
Ft. Lbs.
19203
MODULE
Fig. 1 – Magnetron Ignition
BREAKER
POINTS
Fig. 2 – Breaker Point Ignition
Nm
150 203.0
COMPOSITE STYLE
ARMATURE
ARMATURE