Yamaha YXR660FAS Service Manual download pdf (Page 166)

100

101

4 - 36

ENG

CYLINDER AND PISTON

CHECKING THE PISTON RINGS

1. Measure:

• ring side clearance

Use a thickness gauge.

Out of specification → Replace the piston

and rings as a set.

NOTE:

Clean carbon from the piston ring grooves and

rings before measuring the side clearance.

Side clearance

Standard Limit

Top ring

0.04 ~ 0.08 mm

(0.0016 ~ 0.0031 in)

0.13 mm

(0.0051 in)

2nd ring

0.03 ~ 0.07 mm

(0.0012 ~ 0.0028 in)

0.13 mm

(0.0051 in)

2. Position:

• piston ring

(in cylinder)

NOTE:

Insert a ring into the cylinder and push it

approximately 50 mm (2.0 in) into the cylinder.

Push the ring with the piston crown so that the

ring will be at a right angle to the cylinder bore.

50 mm (2.0 in)

3. Measure:

• ring end gap

Out of specification → Replace.

NOTE:

You cannot measure the end gap on the

expander spacer of the oil control ring. If the oil

control ring rails show excessive gap, replace

all three rings.

End gap

Standard Limit

Top ring

0.30 ~ 0.45 mm

(0.0118 ~ 0.0177 in)

0.70 mm

(0.0276 in)

2nd ring

0.30 ~ 0.45 mm

(0.0118 ~ 0.0177 in)

0.80 mm

(0.0315 in)

Oil ring

0.20 ~ 0.70 mm

(0.0079 ~ 0.0276 in)

—

1 2 ... 161 162 163 164 165 166 167 168 169 170 171 ... 420 421

Comments to this Manuals

No comments

Yamaha YXR660FAS Service Manual Page 166

Comments to this Manuals

Related products and manuals for Toys & accessories Yamaha YXR660FAS