Yamaha WR250FM service manual Usa Europe, Cdn Za, Aus, Nz

MAINTENANCE SPECIFICATIONS

SPEC

Item		Standard		Limit
Clutch:
Friction plate thickness		2.9 ~ 3.1 mm (0.114 ~ 0.122 in)		2.7 mm
				(0.106 in)
Quantity		9		----
Clutch plate thickness		1.1 ~ 1.3 mm (0.043 ~ 0.051 in)		----
Quantity		8		----
Warp limit		----		0.1 mm
				(0.004 in)
Clutch spring free length		37.0 mm (1.46 in)		36.0 mm
				(1.42 in)
Quantity		5		----
Clutch housing thrust clearance		0.10 ~ 0.35 mm		----
		(0.0039 ~ 0.0138 in)
Clutch housing radial clearance		0.010 ~ 0.044 mm		----
		(0.0004 ~ 0.0017 in)
Clutch release method		Inner push, cam push		----
Shifter:
Shifter type		Cam drum and guide bar		----
Guide bar bending limit		----		0.05 mm
				(0.002 in)
Kickstarter:
Type		Kick and ratchet type		----
Carburetor:		USA	EUROPE, CDN,
			ZA, AUS, NZ
Type/manufacturer
		FCR-MX37/KEIHIN	←
I. D. mark		5UM1 00	5UM2 10
Main jet	(M.J)	#185	#172
Main air jet	(M.A.J)	ø2.0	←
Jet needle	(J.N)	OBDVS-4	OBELP-4
Cutaway	(C.A)	1.5	←
Pilot jet	(P.J)	#40	←
Pilot air jet	(P.A.J)	#75	←
Pilot outlet	(P.O)	ø0.9	←
Pilot screw (example)	(P.S)	2	1-7/8
Bypass	(B.P)	ø1.0	←
Valve seat size	(V.S)	ø3.8	←
Starter jet	(G.S)	#72	←
Leak jet	(Acc.P)	#90	←
Float height	(F.H)	8 mm (0.31 in)	←
Engine idle speed		1,900 ~ 2,100 r/min	←
Intake vacuum		26.7 ~ 32.0 kPa	←
		(200 ~ 240 mmHg,
		7.87 ~ 9.45 inHg)
Hot starter lever free play		3 ~ 6 mm	←
		(0.12 ~ 0.24 in)

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