Yamaha WR250FM service manual OIL Pressure Inspection, Pilot Screw Adjustment

OIL PRESSURE INSPECTION/ PILOT SCREW ADJUSTMENT

INSP

ADJ

OIL PRESSURE INSPECTION

1.Check:

• Oil pressure

Checking steps:

•Slightly loosen the oil pressure check bolt

1.

•Start the engine and keep it idling until oil starts to seep from the oil pressure check bolt. If no oil comes out after one minute, turn the engine off so it will not seize.

•Check oil passages and oil pump for dam- age or leakage.

•Start the engine after solving the prob- lem(s) and recheck the oil pressure.

•Tighten the oil pressure check bolt.

T .

R .

Oil pressure check bolt:

10 Nm (1.0 m • kg, 7.2 ft • lb)

PILOT SCREW ADJUSTMENT

1.Adjust:

• Pilot screw 1

Adjustment steps:

NOTE:

To optimize the fuel flow at a smaller throttle opening, each machine’s pilot screw has been individually set at the factory. Before adjusting the pilot screw, turn it in fully and count the number of turns. Record this num- ber as the factory-set number of turns out.

•Turn in the pilot screw until it is lightly seated.

•Turn out the pilot screw by the factory-set number of turns.

Pilot screw:

2 turns out (example)

*1-7/8 turns out

*Except for USA

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