Yamaha 440 Service Manual download pdf (Page 41)

3. Reassembly and adjustment

CAUTION:-----------,

1)

Wash

all

parts

in

clean

gasoline

be-

fore

assembling.

2)

Always

use

new

a-rings.

3)

Make

sure

moving

parts

rotate

or

slide

smoothly.

4)

Apply

grease

to

contact

surfaces

of

the

throttle

shaft.

1980 SRX440

NOTE:

-------------

The pilot screw

must

not

be tightened ex-

cessively.

51

Install the valve seat.

Tightening torque:

5 Nm (0.5 m-kg)

6) Put

the

valve needle

into

the valve seat.

NOTE:

----'-----------

After

assembling. take care

not

to

allow

dust

and

dirt

to enter.

7) Float level

(1) Reinstall components. except for

the

float

chamber.

(2) Incline the carburetor at

20

~

30°

(so

that

the

end of the

float

valve

a. Carburetor

body

1) Install the main nozzle.

main

jet.

and

pilot

jet.

Tightening torque:

Main nozzle: 5 Nm (0.5 m-kg)

Main jet: 2 Nm (0.2 m-kg)

Pilot jet:

0.8

Nm

(0.08

m-kg)

.

2) Install the

power

jet

and

power

jet

cover

bolt.

Tightening torque:

Power jet:

1.8. Nm

(0.18

m-kg)

Power

jet

cover bolt:

4 Nm (0.4 m-kg)

3) Install

the

throttle

stop screw and coil

spring.

Adjustment:

See"

Low speed

tuning."

4) Install

the

pilot

screw

and coil spring.

Adjustment:

See"

Low

speed

tuning."

4-9

weight),

and

measure

the

distance

from the

mating

suface of

the

float

chamber and carburetor to the

top

of

the

float

using a gauge.

Float level:

.

30

± 1 mm

(1.18

±

0.04

in)

.

NOTE:-----------~

The

float

should

be

just

resting on. but

not

depressing the spring loaded

inlet

needle.

1. Float level

(3)

If

the

float

level is

not

within

the

specified range. check

the

valve

seat and needle valve.

And

replace

any damaged part.

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