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