Yamaha SL338D - Page 93

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ENGINE MAINf.ENANCE -Carburetion and Fuel System
Trouble
C
au se Remedy
4. Engine
spee d
wi 11 not incr ease.
Ma in adjust i ng
screw is not
wo rkable.
o Main adjusting sc rew adjustment is im-
proper.
See 81 page 83 and readjust.
Note:
1 .
o Fuel pump is fau lt y.
Fig.
7-35
o Fuel passage is clogged.
In order to maintain the
di aphragm ca rburetor in
good condit ion
it must be cleaned and check ed
pe riod i ca I l y. Dust and ca re less hand I ing are the
major
caus es for ca rburetor m alfun cti ons. Clea n-
ing and checking should be conducted in a clean
place. For cleaning, g
aso line should be u se d.
Sol
uti ons in cl uding alcoh ol, a ce tone, l ac quer,
thinner, benzo
l, et c. should not be u se d as cleaning
age
nt s for they will damage the synthetic rubber in
th e car bur etor.
-87-
Air is in fuel pump .
Remove
plug sc rew, and bleed air at idling
speed. (Fig. 7-35.)
Overhaul ca rburetor.
2. When the
primer pump is used for the diaphragm
type carburetor, it should not be squeezed more
than one
time or an excess amount of fuel wil I be
fed to the cylinder.
3. Fuel filter is attached in the fuel tank.
It is advisable that it be replaced with a new one
ea ch season . If the filter is found faulty (obstruct-
ing
the fuel flow or having a breakage in the
element),
it should be replaced in the form , of an
assembly
unit .
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