Oil Pressure Inspection; Pilot Screw Adjustment - Yamaha YZ250F(R) Owner's Service Manual

OIL PRESSURE INSPECTION/

PILOT SCREW ADJUSTMENT

OIL PRESSURE INSPECTION
1. Check:
Checking steps:
Slightly loosen the oil pressure check bolt
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1.
Start the engine and keep it idling until oil
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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-
G
age or leakage.
Start the engine after solving the prob-
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lem(s) and recheck the oil pressure.
Tighten the oil pressure check bolt.
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PILOT SCREW ADJUSTMENT
1. Adjust:
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
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seated.
Turn out the pilot screw by the factory-set
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number of turns.
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Oil pressure
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Oil pressure check bolt:
10 Nm (1.0 m • kg, 7.2 ft • lb)
Pilot screw 1
G
Pilot screw:
1-5/8 turns out (example)
INSP
ADJ