Service manual

ManualsBrandsSCORPION ManualsSnowmobiles1975 Brut

)

(

PILOT

SYSTEM

ADJUSTMENT

1.

The

pilot

outlet

and

by

-

pass

opening

are

sized

to

match

the

carburetor

bore.

The

pilot

jet

opening

and

the

air

screw

position

are

equally

important.

2.

Pilot

Jet

Size

Check

a.

Elevate

the

sled

so

that

the

track

is

clear

of

the

ground

and

start

the

engine.

b.

Open

the

throttle

slightly

and

observe

the

speed

increase

characteristics.

c.

If

the

exhaust

smoke

is

heavy

and

the

exhaust

noise

dull,

the

pilot

jet

is

too

big.

d.

If

the

increase

of

engine

speed

is

slow

and

irregular

or

if

speed

can

not

be

maintained

in

the

12-25

MPH

range

with

throttle

constant,

the

pilot

jet

is

too

small.

3.

Air

Screw

Position.

a.

Warm

up

the

engine.

b.

Set

the

idle

speed

screw

about

15%

higher

than

the

desired

idle

speed.

c.

Turn

the

air

screw

in

and

out

to

deter-

mine

the

point

at

which

the

engine

RPM

is

maximum.

d.

Adjust

the

idle

speed

screw

to

the

desired

level.

e.

Check

again

for

the

point

of

maximum

engine

RPM

by

turning

the

air

screw

in

and

out,

1

/4.

to

1

/2

turn

in

each

direc-

tion.

SERVICE

MANUAL·

1975

SCORPION

BRUT

2-

ll