Yamaha FZ 25 2021, Supplementary Service Manual

Page: 41 / 247

2-4
SPEC
MAINTENANCE SPECIFICATION (ENGINE)
Cylinder
Bore 74.000–74.016 mm (2.9134–2.9140 in)
Wear limit 74.066 mm (2.9160 in)
Piston
Diameter D 73.983–73.998 mm (2.9127–2.9133 in)
Measuring point (from piston skirt bottom) 5.0 mm (0.20 in)
Piston-to-cylinder clearance 0.010–0.025 mm (0.0004–0.0010 in)
Piston pin bore inside diameter 17.002–17.013 mm (0.6694–0.6698 in)
Limit 17.043 mm (0.6710 in)
Piston pin outside diameter 16.995–17.000 mm (0.6691–0.6693 in)
Limit 16.975 mm (0.6683 in)
Piston-pin-to-piston-pin-bore clearance 0.002–0.018 mm (0.0001–0.0007 in)
Piston ring
Top ring
End gap limit 0.56 mm (0.0220 in)
Ring side clearance 0.030–0.065 mm (0.0012–0.0026 in)
Side clearance limit 0.115 mm (0.0045 in)
2nd ring
End gap limit 0.80 mm (0.0314 in)
Ring side clearance 0.020–0.055 mm (0.0008–0.0022 in)
Side clearance limit 0.115 mm (0.0045 in)
Crankshaft
Crank assembly width 69.25–69.30 mm (2.726–2.728 in)
Runout limit 0.030 mm (0.0012 in)
Clutch
Clutch type Wet, multiple-disc
Clutch lever free play 10.0–15.0 mm (0.39–0.59 in)
Friction plate thickness 2.92–3.08 mm (0.115–0.121 in)
Wear limit 2.82 mm (0.111 in)
Plate quantity 1 pc
Friction plate thickness 2.92–3.08 mm (0.115–0.121 in)
Wear limit 2.82 mm (0.111 in)
Plate quantity 4 pcs
Friction plate thickness 2.92–3.08 mm (0.115–0.121 in)
Wear limit 2.82 mm (0.111 in)
Plate quantity 1 pc
Clutch plate thickness 1.49–1.71 mm (0.059–0.067 in)
Plate quantity 5 pcs
Warpage limit 0.10 mm (0.004 in)
Clutch spring free length 41.60 mm (1.64 in)
Limit 39.52 mm (1.56 in)
Spring quantity 4 pcs
Push rod bending limit 0.50 mm (0.020 in)
B9X-F8197-E0.book Page 4 Thursday, July 16, 2020 2:28 PM