Yamaha UMAX, Руководство по обслуживанию

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ENGINE SPECIFICATIONS (YUM1A/YUM2A)
2-4
Valve, valve seat, valve guide
Valve clearance cold
Intake and exhaust side 0.05–0.09 mm (0.0020–0.0035 in)
Valve dimensions
Valve seat contact width (intake) 0.7–0.9 mm (0.0276–0.0354 in)
Valve seat contact width (intake) limit 1.6 mm (0.063 in)
Valve seat contact width (exhaust) 0.7–0.9 mm (0.0276–0.0354 in)
Valve seat contact width (exhaust) limit 1.6 mm (0.063 in)
Valve-stem-to-valve-guide clearance (intake)
limit 0.080 mm (0.0032 in)
Valve-stem-to-valve-guide clearance
(exhaust) limit 0.100 mm (0.0039 in)
Valve stem runout 0.010 mm (0.0004 in)
Valve push rod
Valve push rod runout 0.15 mm (0.006 in)
Valve spring
Free length (intake) 36.2 mm (1.43 in)
Limit 34.4 mm (1.35 in)
Free length (exhaust) 36.2 mm (1.43 in)
Limit 34.4 mm (1.35 in)
Cylinder
Bore 85.000–85.020 mm (3.3465–3.3472 in)
Wear limit 85.050 mm (3.3484 in)
Piston
Piston-to-cylinder clearance 0.043–0.057 mm (0.00017–0.0022 in)
Diameter 84.977–84.998 mm (3.3456–3.3464 in)
Piston pin outside diameter 19.995–20.000 mm (0.7872–0.7874 in)
Limit 19.975 mm (0.7864 in)
Piston pin bore inside diameter 20.0004–20.015 mm (0.7876–0.7880 in)
Limit 20.045 mm (0.7892 in)
Piston-pin-to-piston-pin-bore clearance 0.004–0.020 mm (0.0002–0.0008 in)
Piston ring
Top ring
Ring type Barrel
End gap (installed) limit 0.60 mm (0.0236 in)
Ring side clearance 0.040–0.080 mm (0.0016–0.0031 in)
2nd ring
Ring type Taper
End gap (installed) limit 0.80 mm (0.0350 in)
Ring side clearance 0.030–0.070 mm (0.0012–0.0028 in)
Crankshaft
Runout limit 0.05 mm (0.002 in)
Crankshaft pin outside diameter 35.969–35.984 mm (1.4161–1.4167 in)
Crankshaft pin to connecting rod clearance 0.016–0.046 mm (0.0006–0.0018 in)