Yamaha WR250FM Dial gauge and stand YU-3097/90890-01252 Standard Limit, Oil delivery pipe

CRANKCASE AND CRANKSHAFT

ENG

EC4N4201

Crankshaft

1.Measure:

•Runout limit a

•Small end free play limit b

•Connecting rod big end side clearance c

•Crank width d

Out of specification → Replace.

Use the dial gauge and a thickness gauge.

Dial gauge and stand:

YU-3097/90890-01252

	Standard	<Limit>
Runout	0.03 mm	0.05 mm
limit:	(0.0012 in)	(0.002 in)
Small end	0.4 ~ 1.0 mm	2.0 mm
free play:	(0.016 ~ 0.039 in)	(0.08 in)
Side	0.15 ~ 0.45 mm	0.50 mm
clearance:	(0.0059 ~ 0.0177 in)	(0.02 in)
Crack	55.95 ~ 56.00 mm	—
width:	(2.203 ~ 2.205 in)

Oil strainer

1.Inspect:

•Oil strainer

Damage → Replace.

Oil delivery pipe 2

1.Inspect:

•Oil delivery pipe 2 1

•O-ring 2

Damage → Replace.

•Oil orifice a Clogged → Blow.

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