Yamaha 440 Service Manual download pdf (Page 44)

1980 SRX440

Trouble Check

point

Remedy

Adjustment

Clogged

power

jet

Clean

Clogged fuel pipe

Clean or replace

Dirty

fuel

tank

Clean fuel

tank

Air leaking into fuel line

Check

joint

and

retighten

low

fuel

pump

performance

Repair

pump

or

replace

Clogged fuel

filter

Replace

Clogged silencer

outlet

Check for ice. and

remove

Abnormal combustion

lean

mixtures Clean

carburetor

and

adjust

(Mainly

backfire)

Dirty

carburetor

Clean

carburetor

Dirty

or clogged fuel pipe

Clean or replace fuel pipe

Overflow

Clogged air

vent

Clean

(Relative troubles)

Clogged

float

valve Disassemble and clean

Clean while taking care not to

Power idleing

scratch

valve

seat

Poor

performance

at

low.

mid-range.

and high

Scratched or

unevenly

worn

Clean or replace

float

valve Valve seat is press-fitted to body.

speeds

float

valve or valve seat and valve seat So

body

must

be replaced if seat is

Excessive fuel

consumption

damaged.

Hard

starting

Broken

float

Replace

float

Power

loss

Poor acceleration

Incorrect

float

level

If not

within

the specified

range. check the

following

parts

and replace any

defective

part

•

Worn

float

tang

Replace

float

Replace

float

assembly.

•

Worn

arm pin

Replace arm pin

•

uerormeo

ttoat

arm aeotece neat

.

4-2.

FUEL

PUMP

Check to see

if

fuel moves

from

tank

to

carburetor. and if any fuel leaks

from

pipe

joints

or fuel

pump

body.

Replace fuel

pump

assembly as required.

1. Fuel

pump

4-12

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