Yamaha XS650SG Specifications download pdf (Page 30)

-7

Q

-t-

A

I

B

4. All camshaft bearings should be removed,

cleaned, dried, and the races visually

checked for pits, rust spots or chatter

marks where the balls have dragged, If

any of these conditions exists the bear-

ing(s) should be replaced.

G.Cam chain, sprocket and dampers

1. Cam chain

Except in cases of oil starvation, the cam

chain wears very little. If the cam chain

has stretched excessively and it is difficult

to keep the proper cam chain tension, the

chain should be replaced.

2. Cam sprockets

Check cam sprockets for obvious wear.

3. Cam chain dampers

Inspect the two vertical (slipper-type)

dampers for excessive wear. Any that

shows excessive wear should be replaced.

Worn dampers may indicate an impro-

perly adjusted or worn-out cam chain,

H. Cylinder

1.

Inspect the cylinder walls for scratches. If

vertical scratches are evident, the cylinder

wall should be rebored or the cylinder

should be replaced.

2. Measure cylinder wall wear as shown. If

wear is excessive, compression pressure

will decrease. Rebore the cylinder wall

and replace the piston and piston rings.

Cylinder wear should be measured at

three depths with a cylinder bore gauge.

(See illustration.)

I I

Standard

Wear

Ilmit

I

1

Cylinder

/

outof-round

If the cylinder wall is worn more than

wear limit, it should be rebored.

I. Piston and piston rings

1.

Piston

a. Measure the outside diameter of the

piston at the piston skirt.

Measurement should be made at a point

10 mm (0.394 in) above the bottom edge

of the piston. Place the micrometer at

right angles to the piston pin.

Standard:

74.96, 74.97

mm

(2.951, 2.952 in)

Oversize 1:

75.25 mm (2.963 in)

Oversize 2:

75.50 mm (2.972 in)

Oversize 3:

75.75 mm (2.982 in)

Oversize 4:

76.00 mm (2.992 in)

26

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 214 215

Comments to this Manuals

No comments