Yamaha WR250FM service manual Maintenance Specifications, Engine

MAINTENANCE SPECIFICATIONS

MAINTENANCE SPECIFICATIONS

ENGINE

SPEC

Item	Standard	Limit
Cylinder head:
Warp limit	----	0.05 mm
		(0.002 in)

Cylinder:
Bore size		77.00 ~ 77.01 mm	----
		(3.0315 ~ 3.0319 in)
Out of round limit	----		0.05 mm
			(0.002 in)
Camshaft:
Drive method		Chain drive (Left)	----
Camshaft cap inside diameter		22.000 ~ 22.021 mm	----
		(0.8661 ~ 0.8670 in)
Camshaft outside diameter		21.967 ~ 21.980 mm	----
		(0.8648 ~ 0.8654 in)
Shaft-to-cap clearance		0.020 ~ 0.054 mm	0.08 mm
		(0.0008 ~ 0.0021 in)	(0.003 in)
Cam dimensions

A

	B
Intake		“A”		30.296 ~ 30.346 mm	30.196 mm
				(1.1923 ~ 1.1947 in)	(1.1888 in)
		“B”		22.45 ~ 22.55 mm	22.35 mm
				(0.8839 ~ 0.8878 in)	(0.8799 in)
Exhaust		“A”		30.399 ~ 30.499 mm	30.299 mm
				(1.1968 ~ 1.2007 in)	(1.1929 in)
		“B”		22.45 ~ 22.55 mm	22.35 mm
				(0.8839 ~ 0.8878 in)	(0.8799 in)
Camshaft runout limit			----		0.03 mm
					(0.0012 in)

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