Yamaha YZF-R1 (2006) [34/426] Engine specifications

ENGINE SPECIFICATIONS

2-5

Valve spring

Inner spring

Free length (intake) 39.79 mm (1.57 in)

Free length (exhaust) 38.42 mm (1.51 in)

Installed length (intake) 35.50 mm (1.40 in)

Installed length (exhaust) 33.00 mm (1.30 in)

Spring rate K1 (intake) 42.91 N/mm (245.02 lb/in) (4.38 kgf/mm)

Spring rate K2 (intake) 56.23 N/mm (321.07 lb/in) (5.73 kgf/mm)

Spring rate K1 (exhaust) 40.10 N/mm (228.97 lb/in) (4.09 kgf/mm)

Spring rate K2 (exhaust) 51.85 N/mm (296.06 lb/in) (5.29 kgf/mm)

Installed compression spring force (intake) 171–197 N (38.44–44.29 lbf) (17.44–20.09

kgf) at 35.50 mm (1.398 in)

Installed compression spring force (exhaust) 202–232 N (45.41–52.15 lbf) (20.60–23.66

kgf) at 33.00 mm (1.299 in)

Spring tilt (intake)* 2.5 °/1.7 mm

Spring tilt (exhaust)* 2.5 °/1.7 mm

Winding direction (intake) Clockwise

Winding direction (exhaust) Clockwise

Cylinder

Bore 77.000–77.010 mm (3.0315–3.0319 in)

Taper limit 0.050 mm (0.0020 in)

Out of round limit 0.050 mm (0.0020 in)

Piston

Piston-to-cylinder clearance 0.010–0.035 mm (0.0004–0.0014 in)

Limit 0.12 mm (0.0047 in)

Diameter D 76.975–76.990 mm (3.0305–3.0311 in)

Height H 12.0 mm (0.47 in)

Offset 0.50 mm (0.0197 in)

Offset direction Intake side

Piston pin bore inside diameter 17.002–17.013 mm (0.6694–0.6698 in)

Piston pin outside diameter 16.991–17.000 mm (0.6689–0.6693 in)

Piston ring

Top ring

Ring type Barrel

Dimensions (B × T) 0.90 × 2.75 mm (0.04 × 0.11 in)