Checking The Exhaust System; Checking The Fuel Line; Checking The Engine Oil Level - Yamaha YZ450F Owner's Service Manual

CHECKING THE EXHAUST SYSTEM

EASB111082
1. Remove:
• Exhaust pipe protector
2. Check:
• Exhaust pipe 1
• Exhaust pipe 2
• Silencer
Crack/damage  Replace.
Refer to "ENGINE REMOVAL" on page 5-1.
• Exhaust gas
Leaks  Replace the gasket.
Refer to "ENGINE REMOVAL" on page 5-1.
3. Check:
• Tightening torques
Exhaust pipe bolt 1 and nut "1"
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
Exhaust pipe 1 and exhaust pipe
2 bolt "2"
12 Nm (1.2 m·kgf, 8.7 ft·lbf)
Exhaust pipe 2 and silencer bolt
"3"
12 Nm (1.2 m·kgf, 8.7 ft·lbf)
Silencer and silencer bracket bolt
"4"
30 Nm (3.0 m·kgf, 22 ft·lbf)
2
4
4. Install:
• Exhaust pipe protector
Exhaust pipe protector screw
10 Nm (1.0 m·kgf, 7.2 ft·lbf)
LOCTITE®

CHECKING THE FUEL LINE

EASB111083
1. Remove:
2. Check:
3. Install:
1

CHECKING THE ENGINE OIL LEVEL

EASB111084
1. Stand the vehicle upright on a level surface.
2. Start the engine, warm this up for 2–3 min-
3. Check:
3
3-14
• Seat
• Side cover (left/right)
• Air scoop (left/right)
Refer to "GENERAL CHASSIS" on page 4-
1.
• Fuel tank
Refer to "FUEL TANK" on page 7-1.
• Fuel hose "1"
Crack/damage  Replace.
Loose connection  Connect properly.
• Fuel tank
Refer to "FUEL TANK" on page 7-1.
• Air scoop (left/right)
• Seat
• Side cover (left/right)
Refer to "GENERAL CHASSIS" on page 4-
1.
utes, and then stop the engine and wait
about 1 minute.
• Oil level
Make sure that the engine oil level is above
the minimum level mark "a" shown for the oil
level check window "1", and that the engine
oil does not come out by removing the oil
check bolt "2".
The minimum level mark "a" or below  Add
the engine oil until its level exceeds the min-
imum level mark "a".
Engine oil coming out of the oil check bolt 
Drain it until its last drop is out.
ENGINE
1