Yamaha FJR1300A(X), Service Manual, Page: 56 / 754

ENGINE SPECIFICATIONS
2-5
Valve-stem-to-valve-guide clearance (exhaust) 0.020–0.047 mm (0.0008–0.0019 in)
Limit 0.105 mm (0.0041 in)
Valve stem runout 0.010 mm (0.0004 in)
Cylinder head valve seat width (intake) 0.90–1.10 mm (0.0354–0.0433 in)
Cylinder head valve seat width (exhaust) 0.90–1.10 mm (0.0354–0.0433 in)
Valve spring
Free length (intake) 39.73 mm (1.56 in)
Limit 37.74 mm (1.49 in)
Free length (exhaust) 39.73 mm (1.56 in)
Limit 37.74 mm (1.49 in)
Installed length (intake) 33.00 mm (1.30 in)
Installed length (exhaust) 33.00 mm (1.30 in)
Spring rate K1 (intake) 21.85 N/mm (124.76 lb/in) (2.23 kgf/mm)
Spring rate K2 (intake) 28.34 N/mm (161.82 lb/in) (2.89 kgf/mm)
Spring rate K1 (exhaust) 21.85 N/mm (124.76 lb/in) (2.23 kgf/mm)
Spring rate K2 (exhaust) 28.34 N/mm (161.82 lb/in) (2.89 kgf/mm)
Installed compression spring force (intake) 136.00–158.00 N (30.57–35.52 lb) (13.87–
16.11 kgf)
Installed compression spring force (exhaust) 136.00–158.00 N (30.57–35.52 lb) (13.87–
16.11 kgf)
Spring tilt (intake) 2.5°/1.7 mm (2.5°/0.067 in)
Spring tilt (exhaust) 2.5°/1.7 mm (2.5°/0.067 in)
Winding direction (intake) Clockwise
Winding direction (exhaust) Clockwise
Cylinder
Bore 79.000–79.010 mm (3.1102–3.1106 in)
Taper limit 0.050 mm (0.0020 in)
Out of round limit 0.050 mm (0.0020 in)
Piston
Piston-to-cylinder clearance 0.020–0.045 mm (0.0008–0.0018 in)
Limit 0.12 mm (0.0047 in)
Diameter D 78.965–78.980 mm (3.1089–3.1094 in)