FUEL. EMISSION COl'.'TR
OL
AND
EXH
AUST
SYSTEMS
197
®
@
'II
Dlmenalon A
Upside
down
Rejett
in
g the Carburetor
Do not try
to
solve a poor running engine
problem
by
rej
elling the carburetor if a
ll
of
the
fo
ll
owing conditions hold true:
a. The engine
ha
s
he
ld a good tunc
in
th
e past
with the standa
rd
jelling.
b. The engine h
as
not been modified.
c.
The motor
cy
cle is being operated
in
the same
geographical region und
er
the same general
clima
ti
c
co
nditions
as
in
th
e past.
d. The motorcycle was and
is
be
ing ridden
at
ave
ra
ge
hi
gh
way
speed
s.
If those conditions all hold tru
e.
th
e chances are
that the problem is due
to
a
mal
fu
nction
in
the
carburetor
or
in ano
th
er componenl that needs
to
be adjusted
or
repaired. Changing ca rburetor jet
size probably won't solve the problem.
Rejelling
the ca rburetor
ma
y
be
necessary if any
of
the
fo
ll
owing conditions hold true:
a. A non-standard type of
ai
r filter eleme
nt
is
being used.
b. A non-standard
ex
haust system
is
in
stall
ed
on
the motor
cyc
l
e.
c.
Any
of
the top e
nd
componenls in
th
e engine
(piston. camshaft, valves. compression ratio.
etc.)
hav
e been modified.
d. The
mot
orcycle
is
in
use
at
considerably higher
or lower altitudes or in a con
si
derably hOlier
or colder climate than
in
th
e past.
e.
Th
e motorcycle is being
opera
ted at
considerably higher speeds than before and
changi ng
10 colder spark plugs does not sol
ve
th
e problem.
f.
Someone
has
previous
ly changed the
carburetor jetting.
g. The motorcycle
ha
s never held a satisfactory
engine tunc.
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