2023-2026 Yamaha YZ450F / YZ450FSMaintenance schedule

Motocross - 450cc four-stroke

Scheduled against races ridden and approximate engine hours (2.5 h per race).

Verified

Every interval on this page was read directly from the OEM chart.

Intervals

After break-in
Every race (about 2.5 hours)
Every third race (about 7.5 hours)
Every fifth race (about 12.5 hours)
As required

Full schedule (88 items)

2023-2026 Yamaha YZ450F / YZ450FS scheduled maintenance items and intervals
Item	Action	Interval
Air filter Clean and lubricate.	Clean, Lubricate	Every 2.5 hrs Also marked: After break-in
Brake pedal, footrest Lubricate.	Lubricate	Every 2.5 hrs Also marked: After break-in
Brake(s) Adjust lever position and pedal position.	Adjust	Every 2.5 hrs Also marked: After break-in
Brake(s) Lubricate pivot point.	Lubricate	Every 2.5 hrs Also marked: After break-in
Brake(s) Check brake disc surface.	Inspect	Every 2.5 hrs Also marked: After break-in
Brake(s) Check fluid level and leakage.	Inspect	Every 2.5 hrs Also marked: After break-in
Brake(s) Retighten brake disc bolts, caliper bolts, master cylinder bolts and union bolts. (Check for tightening torques.)	Inspect	Every 2.5 hrs Also marked: After break-in
Cables Routing (Connection)	Inspect	Every 2.5 hrs Also marked: After break-in
Cables Check and grease.	Lubricate	Every 2.5 hrs Also marked: After break-in
Cables Check throttle cables on the throttle body for dirt and wear.	Inspect	Every 2.5 hrs Also marked: After break-in
Clutch Inspect housing, friction plate, clutch plate and spring.	Inspect	Every 2.5 hrs Also marked: After break-in
Cooling system Check coolant level and leakage.	Inspect	Every 2.5 hrs Also marked: After break-in
Cooling system Check radiator cap attached.	Inspect	Every 2.5 hrs Also marked: After break-in
Cooling system Inspect hoses.	Inspect	Every 2.5 hrs
Drive chain Clean, lubricate, slack, alignment.	Clean, Lubricate	Every 2.5 hrs Also marked: After break-in
Drive chain guide Inspect wear.	Inspect	Every 2.5 hrs
Engine oil Check the engine oil amount.	Inspect	Every 2.5 hrs Also marked: As required
Exhaust pipe, silencer, protector Check for exhaust leaks, and tightening torques.	Inspect	Every 2.5 hrs Also marked: After break-in
Frame Clean and inspect.	Clean	Every 2.5 hrs Also marked: After break-in
Front fork leg(s) Clean.	Clean	Every 2.5 hrs Also marked: After break-in
Front fork leg(s) Inspect and adjust.	Adjust	Every 2.5 hrs Also marked: After break-in
Front fork leg(s) Clean and grease oil seals and dust seals.	Clean, Lubricate	Every 2.5 hrs Also marked: After break-in; As required
Outside nuts and bolts Retighten.	Inspect	Every 2.5 hrs Also marked: After break-in
Rear shock absorber Inspect and adjust.	Adjust	Every 2.5 hrs Also marked: After break-in
Rear shock absorber Check for tightening torques.	Inspect	Every 2.5 hrs Also marked: After break-in
Relay arm, connecting rod Inspect, lube and retighten.	Inspect	Every 2.5 hrs Also marked: After break-in
Steering head Inspect free play and retighten. (Check for tightening torques.)	Inspect	Every 2.5 hrs Also marked: After break-in
Swingarm Inspect, lube and retighten.	Inspect	Every 2.5 hrs Also marked: After break-in
Tire, wheels Inspect air pressure, wheel run-out, tire wear and spoke looseness.	Inspect	Every 2.5 hrs Also marked: After break-in
Tire, wheels Retighten sprocket bolt.	Inspect	Every 2.5 hrs Also marked: After break-in
Engine oil Replace.	Replace	Every 7.5 hrs Also marked: After break-in
Exhaust pipe, silencer, protector Replace fiver. (When the exhaust sound becomes louder or when a performance drop is felt.)	Replace	Every 7.5 hrs Also marked: As required
Fuel tank, fuel pump Inspect.	Inspect	Every 7.5 hrs Also marked: After break-in
Rear shock absorber Grease pillow balls and bearings. (After rain ride)	Lubricate	Every 7.5 hrs Also marked: As required
Spark plug Check the electrodes and the terminals for wear.	Inspect	Every 7.5 hrs Also marked: After break-in
Tire, wheels Check the bearing.	Inspect	Every 7.5 hrs
Tire, wheels Lubricate.	Lubricate	Every 7.5 hrs
Valve Check the valve clearances.	Inspect	Every 7.5 hrs Also marked: After break-in
Camshaft Inspect the camshaft surface. Inspect the decompression system.	Inspect	Every 12.5 hrs
Camshaft sprocket Check for wear on the teeth and for damage.	Inspect	Every 12.5 hrs
Crankshaft Inspect and clean.	Clean	Every 12.5 hrs Also marked: As required
Cylinder Inspect score marks.	Inspect	Every 12.5 hrs
Cylinder head Check the coolant passages for corrosion. Inspect carbon deposits and eliminate them. Check for warpage, and replace the gasket.	Replace	Every 12.5 hrs
Exhaust pipe, silencer, protector Clean.	Clean	Every 12.5 hrs
Front fork leg(s) Replace oil.	Replace	Every 12.5 hrs Also marked: After break-in
Nut (generator rotor) Check for tightening torques.	Inspect	Every 12.5 hrs Also marked: After break-in
Oil filter element Replace.	Replace	Every 12.5 hrs Also marked: After break-in
Piston Replace the piston, piston pin, piston pin clip, and piston ring all as a set.	Replace	Every 12.5 hrs Also marked: As required
Piston pin Replace the piston, piston pin, piston pin clip, and piston ring all as a set.	Replace	Every 12.5 hrs Also marked: As required
Piston ring Replace the piston, piston pin, piston pin clip, and piston ring all as a set.	Replace	Every 12.5 hrs Also marked: As required
Steering head Clean and lube. (After rain ride)	Clean	Every 12.5 hrs
Timing chain Replace.	Replace	Every 12.5 hrs Also marked: As required
Timing chain tensioner Replace.	Replace	Every 12.5 hrs Also marked: As required
Valve Check the valve seats and the valve faces for wear.	Inspect	Every 12.5 hrs
Valve lifter Check for scratches and wear.	Inspect	Every 12.5 hrs
Valve spring Check the free length.	Inspect	Every 12.5 hrs
Air filter Replace.	Replace	One time Also marked: As required
Brake(s) Replace pads.	Replace	One time Also marked: As required
Brake(s) Replace brake fluid.	Replace	One time Also marked: As required
Camshaft Replace.	Replace	One time Also marked: As required
Camshaft sprocket Replace.	Replace	One time Also marked: As required
Clutch Replace.	Replace	One time Also marked: As required
Cooling system Check radiator cap operation.	Inspect	One time Also marked: As required
Cooling system Change the coolant.	Replace	One time Also marked: As required
Cylinder Inspect wear.	Inspect	One time Also marked: As required
Drive chain Replace.	Replace	One time Also marked: As required
Drive chain guide and drive chain support Replace.	Replace	One time Also marked: As required
Engine guard Replace.	Replace	One time Also marked: As required
Front fork leg(s) Replace oil seal.	Replace	One time Also marked: As required
Fuel hose Inspect.	Inspect	One time Also marked: As required
Fuel hose Replace.	Replace	One time Also marked: As required
Levers Adjust clutch lever free play.	Adjust	One time Also marked: As required
Piston Inspect crack.	Inspect	One time Also marked: As required
Piston Inspect carbon deposits and eliminate them.	Inspect	One time Also marked: As required
Piston pin Inspect.	Inspect	One time Also marked: As required
Piston ring Check the end gap of the piston ring.	Inspect	One time Also marked: As required
Protector guide Replace.	Replace	One time Also marked: As required
Shift fork, shift drum, guide bar Inspect wear.	Inspect	One time Also marked: As required
Spark plug Replace.	Replace	One time Also marked: As required
Steering head Replace bearings.	Replace	One time Also marked: As required
Throttle body Inspect.	Inspect	One time Also marked: As required
Timing chain Check for damage and sticking.	Inspect	One time Also marked: As required
Tire, wheels Replace bearings.	Replace	One time Also marked: As required
Transmission Inspect.	Inspect	One time Also marked: As required
Transmission Replace bearings.	Replace	One time Also marked: As required
Valve Replace.	Replace	One time Also marked: As required
Valve lifter Replace.	Replace	One time Also marked: As required
Valve spring Replace.	Replace	One time Also marked: As required

Every row above is factory schedule, straight from the chart. Intervals are shown in hrs.

Specs

From the 2025 manual's technical data section. Check yours before buying — these change between model years.

Displacement: 450 cm³
Compression ratio: 13.0 : 1
Valve clearance (cold): intake: 0.10–0.17 mm (0.0039–0.0067 in)
exhaust: 0.15–0.22 mm (0.0059–0.0087 in)
Spark plug: NGK/LMAR8G
Plug gap: 0.7–0.8 mm (0.028–0.031 in)
Engine oil: oil change: 0.94 L (0.99 US qt, 0.83 Imp.qt)
with filter: 0.96 L (1.01 US qt, 0.84 Imp.qt)
disassembled: 1.20 L (1.27 US qt, 1.06 Imp.qt)
Coolant: capacity: 1.03 L (1.09 US qt, 0.91 Imp.qt)
Fuel: tank: 6.2 L (1.6 US gal, 1.4 Imp.gal)
Tire pressure (cold): front: 100 kPa (1.00 kgf/cm², 15 psi)
rear: 100 kPa (1.00 kgf/cm², 15 psi)
Secondary reduction: 3.769 (49/13)

Legend

Y — Service this item at this interval (marked in the OEM chart)

Chart notes

1. Items marked with an asterisk in the manual should be performed by a Yamaha dealer - they need special tools, data and technical skills.
2. Calendar items (coolant every two years, brake fluid every year, fuel hose every four years) sit in the Remarks column, not in the race columns.

From the manual

Service life of parts varies significantly with the environment the machine runs in (rain, dirt); inspect earlier if conditions are harsh.
Periodic inspection is essential to make full use of machine performance.

Source: 2025 Yamaha YZ450F Owner's Service Manual (D02-2819U-50-E0) · Chart read from the 2025 manual. Intervals change between model years — confirm against yours.

Always confirm intervals, torque specs and part numbers against your own service manual. This site is a shopping aid, not a repair manual.

Open the hour meter tool