Briggs & Stratton Twin Cylinder L-Head Repair Manual page 149

NOTE: Briggs & Stratton opposed twin cylinder
engines use pistons with offset piston pins.
The notch on the piston must face the
flywheel side of engine, Fig. 14.
Thoroughly clean and then oil cylinder bore. Rotate
crankshaft until crankpin journal is at bottom of stroke.
This allows complete entry of compressed rings,
piston and connecting rod assembly, when pushed into
cylinder, Fig. 15.
Clean and oil crankshaft crankpin. Pull connecting rod
against crankpin and install rod cap. Make sure match
marks are together. Install rod screws and washers.
Repeat procedure for other piston and connecting rod
assembly.
NOTE: ENGINE MODELS 400000 – 420000:
With piston and connecting rod assem-
blies installed, the oil hole in the #1
connecting rod must face toward the cam
gear. The oil hole in the #2 connecting rod
must face away from the cam gear, Fig. 16.
6
12
NOTCH
FLYWHEEL
SIDE
Fig. 14
PROJECTIONS
DOWN
Fig. 15 – Install Piston Assembly
CYL. #2
NO. 1 ROD
WITH HOLE
TOWARD
CAM GEAR
Fig. 16 – Installing Connecting Rods –
Models 400000-420000
OIL HOLE
OPPOSITE
CAM GEAR
FLYWHEEL
SIDE
CYL. #1