Service manual

ManualsBrandsSCORPION ManualsSnowmobiles1975 Brut

SERVICE

MANUAL-

1975

SCORPION

BRUT

NOTES:

1.

The

air

screw

position

should

never

be

more

than

three

(3)

turns

open.

At

this

point

the

spring

ceases

to

function

as

a

lock,

and

the

screw

could

be

lost

in

operation.

2.

If

there

is a

range

in

the

air

screw

ad-

justment

where

the

maximum

engine

RPM

is

essentially

constant

(i.e.,

1

1

/2

to

2

turns).

better

acceleration

will

be

achieved

at

the

lower

setting.

MAIN

SYSTEM

ADJUSTMENT

1.

The

jet

needle

and

needle

jet

serve

to

con-

trol

the

_proper

air/fuel

rati

_o,

and

thereby

engine

performance,

at

partial

loads

(

1

/4

to

%

throttle

valve

opening).

The

jet

needle

tapers

and

the

clearance

between

the

needle

and

needle

jet

increases

as

the

throttle

valve

opening

increases.

The

air/fuel

ratio

is

controlled

by

the

position

of

the

"E"

ring

that

is

inserted

in

one

of

the

five

(5)

slots

on

the

head

of

the

needle.

(See

Fig.

2-21).

2.

The

main

jets

provided

with

the

carburetors

from

the

factory

are:

32

mm

(Brut

340)-

220

34

mm

(Brut

440)

-

340

For

richer

or

leaner

engine

operation

under

special

conditions,

additional

jet

sizes

are

available.

2-12

..r:::

'-

-

-

s:

0

....

u..

....

w

::J

u..

.....r-

2

}

"E"

RING

::;:=!

POSITIONS

+5-8%

4

- 3-

6%

15

50

75

100(%)

THROTTLE

VALVE

OPENING

FIG. 2-21