Yamaha YZF-R1 1998, Service Manual, Page: 27 / 418

ENGINE SPECIFICATIONS
SPEC
2 - 7
Pistons
Piston-to-cylinder clearance 0.03 ~ 0.055 mm 0.12 mm
Diameter D 73.955 ~ 73.970 mm ----
Height H 5 mm ----
Piston pin bore (in the piston)
Diameter 17.002 ~ 17.013 mm ----
Offset 0.5 mm ----
Offset direction Intake side ----
Piston pins
Outside diameter 16.991 ~ 17.000 mm ----
Piston-pin-to-piston-pin-bore
clearance 0.002 ~ 0.022 mm 0.072 mm
Piston rings
Top ring
Ring type Barrel ----
Dimensions (B
×
T) 0.90
×
2.75 mm ----
End gap (installed) 0.19 ~ 0.31 mm ----
Ring side clearance 0.030 ~ 0.065 mm ----
2nd ring
Ring type Taper ----
Dimensions (B
×
T) 0.8
×
2.8 mm ----
End gap (installed) 0.30 ~ 0.45 mm ----
Ring side clearance 0.020 ~ 0.055 mm ----
Oil ring
Dimensions (B
×
T) 1.5
×
2.6 mm ----
End gap (installed) 0.10 ~ 0.35 mm ----
Item Standard Limit
H
D
T
B
B
T
B
T