Yamaha MBK XMAX 2014, Service Manual

Page: 52 / 482

ENGINE SPECIFICATIONS
2-5
Spring rate K1 (exhaust) 23.54 N/mm (2.40 kgf/mm, 134.41 lbf/in)
Spring rate K2 (exhaust) 36.58 N/mm (3.73 kgf/mm, 208.87 lbf/in)
Installed compression spring force (intake) 140.00–162.00 N (14.28–16.52 kgf, 31.47–
36.42 lbf)
Installed compression spring force (exhaust) 140.00–162.00 N (14.28–16.52 kgf, 31.47–
36.42 lbf)
Spring tilt (intake) 2.5 °/1.8 mm (0.07 in)
Spring tilt (exhaust) 2.5 °/1.8 mm (0.07 in)
Winding direction (intake) Clockwise
Winding direction (exhaust) Clockwise
Cylinder
Bore 52.000–52.010 mm (2.0472–2.0476 in)
Wear limit 52.110 mm (2.0516 in)
Taper limit 0.050 mm (0.0020 in)
Out of round limit 0.005 mm (0.0002 in)
Warp limit 0.05 mm (0.0020 in)
Piston
Piston-to-cylinder clearance 0.015–0.048 mm (0.0006–0.0019 in)
Diameter D 51.962–51.985 mm (2.0457–2.0466 in)
Height H 5.0 mm (0.20 in)
Offset 0.50 mm (0.0197 in)
Offset direction Intake side
Piston pin bore inside diameter 14.002–14.013 mm (0.5513–0.5517 in)
Limit 14.043 mm (0.5529 in)
Piston pin outside diameter 13.995–14.000 mm (0.5510–0.5512 in)
Limit 13.975 mm (0.5502 in)
Piston-pin-to-piston-pin-bore clearance 0.002–0.018 mm (0.0001–0.0007 in)
Piston ring
Top ring
Ring type
Barrel
End gap (installed) 0.07–0.17 mm (0.0028–0.0067 in)
Limit 0.42 mm (0.0165 in)
Ring side clearance 0.040–0.080 mm (0.0016–0.0032 in)
Limit 0.120 mm (0.0047 in)
2nd ring
Ring type
Taper
H
D