Harley-Davidson WLA - Page 73

TM
9-879
39-40
MOTORCYCLE, SOLO
(HARLEY- DAVIDSON MODEL
WLA)
Section XI
ENGINE
Paragraph
Description
and data
39
Tune-up
40
Replacement
of head gasket
41
Carbon removal 42
Valve tappet
adjustment
43
Replacement
of oil feed pump
44
39.
DESCRIPTION AND
DATA.
a.
Description. This 2-cyIinder. V-type, air-cooled gasoline
engine
Of
L-head design
operates on
the 4-stroke, 4-cycle principle.
Flywheel
and
connecting rod
assemblies
operate on roller bearings.
Engine is
ntted with
low-expansion
aluminum alloy, cam-ground, horizontally
slotted
pistons and
with
deep-finned aluminum cylinder
heads. As
viewed from left side
of vehicle
(drive chain side), rotation
of engine
is
counterclockwise.
b.
Lubrication system is
of
dry-sump type, in which
oil supply
is
maintained in a tank away
from engine. Oil is
circulated
by a
supply
feed pump and
a
scavenger, return pump. This oil
circulating
system
plays a most important
part in
cooling the engine
as well as
lubricating it.
c.
Data.
Type of
engine
2
-cylinder, V-type,
L-head, air-cooled
*'
Cylinder
bore
2^
in.
Stroke
3i3/i6
in.
Piston
displacement 45.12
cu in.
Compression ratio 5.0:1
Horsepower (N.A.CC. Rating) 6.05
Engine
number (serial), left
side
of engine base,
just
below front cylinder.
40. TUNE-UP.
a.
Tune-up consists of
making
correct adjustment
to
valve
:appets.
circuit breaker ignition
points,
soark plug electrodes: check-
ing and
correcting ignition timing; draining
and flushing
carburetor
bowl;
cleaning
and
flushing
gasoline
strainer: cleaning muffler
outlet,
servicing air cleaner, and adjusting
carburetor.
(1)
Valve tappet adjustment
(par. 43).
(2)
Circuit breaker
point adjustment
(par. 84).
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