Yamaha F200B - Crankcase Assembly

1-13
SPEC
Specification
Crankcase assembly
Valve spring
Free length mm (in) 48.1 (1.89)
Tilt mm (in) 1.7 (0.07)
Valve lifter
Outside diameter mm (in) 30.970–30.980 (1.2193–1.2197)
Valve lifter clearance mm (in) 0.020–0.055 (0.0008–0.0022)
Camshaft
Cam lobe height
Intake mm (in) 46.311–46.411 (1.8233–1.8272)
Exhaust mm (in) 45.360–45.460 (1.7858–1.7898)
Cam lobe width
Intake and exhaust mm (in) 35.950–36.050 (1.4154–1.4193)
Journal diameter mm (in) 24.960–24.980 (0.9827–0.9835)
Runout mm (in) 0.015 (0.0006)
Valve
Clearance
Intake mm (in) 0.205 ± 0.035 (0.0081 ± 0.0014)
Exhaust mm (in) 0.345 ± 0.035 (0.0136 ± 0.0014)
Head diameter
Intake mm (in) 36.400–36.600 (1.4331–1.4409)
Exhaust mm (in) 31.400–31.600 (1.2362–1.2441)
Seat contact width
Intake mm (in) 1.100–1.400 (0.0433–0.0551)
Exhaust mm (in) 1.400–1.700 (0.0551–0.0669)
Margin thickness
Intake mm (in) 0.500–0.900 (0.0197–0.0354)
Exhaust mm (in) 0.900–1.300 (0.0354–0.0512)
Item Unit
Model
F200BET FL200BET F250GET FL250GET
Cylinder
Bore mm (in) 94.000–94.017 (3.7008–3.7014)
Piston
Diameter mm (in) 93.921–93.941 (3.6977–3.6985)
Measuring point mm (in) 13.500 (0.5315)
Piston clearance mm (in) 0.075–0.080 (0.0030–0.0031)
Ring groove (top) mm (in) 1.230–1.250 (0.0484–0.0492)
Ring groove (2nd) mm (in) 1.220–1.240 (0.0480–0.0488)
Ring groove (oil) mm (in) 2.510–2.530 (0.0988–0.0996)
Pin boss inside diameter mm (in) 21.021–21.031 (0.8276–0.8280)
Pin outside diameter mm (in) 21.008–21.017 (0.8271–0.8274)
Oversize diameter
1st mm (in) 94.176–94.186 (3.7077–3.7081)
Item Unit
Model
F200BET FL200BET F250GET FL250GET