Yamaha 440 Service Manual download pdf (Page 83)

8-2.

SPECIFICATIONS

A. General

NOTE: *

......

New

specification

(Compared

with

1979

SRX440)

19S0

SRX440

Model

SRX440D

Model:

Model

(I.8.M.

No.) •

SRX440

('SO) (SK6)

Frame 1.0. & starting number

•

SK6-015101

Engine J.D. & starting

number

•

RT439-015101

Dimension:

Overall length

•

2,570

mm

Overall

width

(std)

•

990mm

Overall heiqht

(w/windshield

935mm

B, Engine

Description:

Engine type Liquid cooled

two

stroke.

twin

cylinders

Engine model

RT439

Displacement

439

ern'

Bore x Stroke 6S.5 x

59.6

mm

Effective compression ratio

7.0:

1

Starting system

Recoil hand starter

Ignition system

C.D.1.

-,.

u"

"

Cylinder head:

"

Combustion

chamber

volume

(with

spark plug)

21.0

ern'

Compression

chamber

type

Dome

+ Squish

Cylinder:

Material

Alum-inurn cylinder

with

hard chrome. bore

Bore size 6S.5 mm

Piston:

Piston skirt clearance (measuring point)

0.065

~

0.070

mm

(10

mm

from piston skirt end)

Piston pin outside

diameter

x length

1>20x 56

m~

,

Piston ring:

Piston ring design (Top) Keystone

Piston ring design

(Znd}

Rin9 end gap (installed) (Top)

0.35

~

0.55

mm

Ring end gap (installed) (2nd)

Small

end bearing:

Type

Needle

bearing

Big end

bearing:

I .

Type ,

Needle

bearing

Crankshaft:

Crankshaft assembly

width

(A)

17S±0.1

mm

Crankshaft assembly

width

(F)

+0

.

60

-0.05

mm

Crankshaft

deflection

(D)

0.03

mm

(D-l)

0.04

mm

(D-2)

0.04

mm

(D-3)

0.05

mm

(D-4)

,

Connecting rod big end side clearance (C)

0.25

~

0.75

mm

Connecting rod small end deflection (P)

2.0mm

•

,

S-3

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