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Yamaha WR450F (Fuel Injected) Maintenance Schedule and Service Intervals

2020 Yamaha WR450F

This is the maintenance schedule and service intervals for the fuel-injected Yamaha WR450F, a street-legal enduro bike that people sometimes convert into supermoto bikes.

The Yamaha WR450F is an enduro bike that’s based on the YZ450F. It’s available in street-legal form (with mirrors, lights etc.) but those are frequently removed.

It succeeded the earlier WR400F and WR426F, which were carburettor-fed more enduro-focussed offerings, with kick starters only.

Since launch in 2003, the WR450F has always been based around a single-cylinder 449cc DOHC liquid-cooled “thumper” engine. It has an electric starter and street gear.

But the WR450F has gone through a few generational changes. Here they are in a nutshell:

  • 2003-2006: The original WR450F, first in the WR line with an electric start (and also a kickstarter with a handle-bar mounted decompressor). Steel-framed. Very modified engine compared to the earlier WRs with lightweight pistons, valves, springs, etc. A 5-valve design.
  • 2007-2011: Lighter aluminium frame, revised tuning, new air cleaner, wave brake rotors, and other new components.
  • 2012-2015: First fuel-injected WR450F, using the old engine but with added fuel injection. Slim frame borrowed from the YZ450F. Rear brake is now wave-type too.
  • 2016-2019: Second version of the fuel-injected WR450F, with a motor now borrowed from the YZ450F, bringing them closer together — a higher-performance 4-valve fuel-injected motor with a reverse slant.
  • 2020+: New, higher higher performance motor. The WR450F and YZ450F are very similar now, other than the WR450F having a wider-ratio gearbox and running gear to be road registered.

The maintenance schedule is quite similar between the years, but there are some different line items, and different maintenance parts.

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What you need to service your Yamaha WR450F

Below are the parts needed

PartYamaha WR450F spec
Engine oilYamalube 10W-40 or Yamalube 10W-50. Can also use 15W-40, 20W-40, or 20W-50. Oil must be API service SG or higher, JASo standard MA. You need just 0.64L of oil.
Oil filterAll WR450F models share the same oil filter, part 5d3-13440-09-00, or the HifloFiltro equivalent HF141.
Spark plugNGK CPR8EA-9 type spark plug with an 0.8-0.9mm gap. This is different to other year models.
CoolantUse ethylene glycol-based coolant only.
Air filterPart for the 2020+ WR450F is B3J1445111. K&N equivalent part is YA-4518XD.
Brake padsBrake pads for the 2020+ WR450F are the same as the 2016-2019 ones. Yamaha part numbers are B292580500 and 1C3W0046B0. For the rear pads you can use EBC brake pads FA185R.
Lubricating greaseUse lithium soap-based grease for external lubrication.
CablesLubricate cables with Protect All Cable Life.
What you need to service the Yamaha WR450F

Maintenance schedule for the Yamaha WR450F

Below is the full maintenance schedule for the Yamaha WR450F. It’s from the manual, though simplified somewhat.

Notes on the maintenance schedule

  • Minor service is every 2,000 km (1,200 mi) or 3 months.
  • Major service is every second minor service and includes the minor service plus checking the valve clearance and cleaning the spark arrester
  • After the end of the schedule, keep going, alternating between major and minor service.

Notes:

  • Yamaha manuals recommend you just do basic lubrication (changing the oil, lubing the chain). But of course most WR owners will do their own maintenance.
  • (1) — previous manuals said to replace brake hoses every 20,000 km or 2 years.
km x 1000135
mi x 10000.61.83
Partmonths136Every
Fuel line* Check fuel hoses for cracks or damage 
* Replace if necessary
Spark plugs* Check condition
* Adjust gap and clean
Valve clearance* Check and adjust valve clearance when engine is cold
Air filter element* Clean with solvent and apply foam air-filter oil equivalent oil
* Replace if necessary
Breather system* Check ventilation hose for cracks or damage and drain any deposits
Fuel injection* Adjust engine idling speed
Exhaust system* Check for leakage, especially around screw clamps
* Tighten if necessary
* Replace gasket(s) if necessary
Engine oil* Change (warm engine befor draining)
Engine oil filter element* Replace
Engine oil strainer* Clean
Clutch* Check operation.
* Adjust or replace cable.
Cooling system* Check hoses for cracks of damage
* Replace if necessary
* Replace with ethylene glycol anti-freeze coolant1 year
Spark arrester* Clean
Front brake* Check operation, fluid level, and for fluid leakage
* Replace brake pads if necessary
* Replace brake fluid1 year
Rear brake* Check operation, fluid level, and for fluid leakage
* Replace brake pads if necessary
* Replace brake fluid1 year
Brake hoses* Check for cracks or damage
* Replace4 years (1)
Wheels* Check runout, spokes tightness and for damage
* Tighten spokes if necessary
Tires* Check tread depth and for damage.
* Replace if necessary.
* Check air pressure.
* Correct if necessary.
Wheel bearings* Check bearings for smooth operation. 
* Replace if necessary.
Swingarm pivot bearings* Check bearing assemblies for looseness
* Moderately repack with with lithium soap-based grease
Drive chain* Check chain slack/alignment and condition.
* Adjust and lubricate chain (Motul chain paste)
Ride
Steering bearings* Check bearing assemblies for looseness.
* Moderately repack with lithium soap-based grease
2000 km (1200 mi) or 1 year
Brake and clutch lever pivot shafts* Apply lithium soap-based grease lightly.
Brake pedal pivot shafts* Apply lithium soap-based grease lightly.
Sidestand pivot* Check operation
* Apply lithium soap-based grease lightly.
Front fork* Check operation and for oil leakage.
* Replace if necessary.
Shock absorber assembly* Check operation and for oil leakage.
* Replace if necessary.
Rear suspension link pivots* Apply molybdenum disulfide grease lightly
Control cables* Apply lubricant thoroughly (Protect all cable life)
Throttle grip housing and cable* Check operation and free play.
* Adjust the throttle cable free play if necessary.
* Lubricate the throttle grip housing and cable. (Protect all cable life)
Chassis fasteners* Check all chassis fitting and fasteners
* Correct if necessary
Battery* Check terminal for looseness and corrosion
Yamaha WR450F maintenance schedule

Tires and tire pressures for the Yamaha WR450F

Here are the recommended tire sizes pressures for the Yamaha WR450F. Stock it comes shod with tubed Metzeler MCE Six Days Extreme tyres, or Dunlop MX3S in Canada.

Of course, these are suggested per the manual and are optimised for life. But owners will adjust based on ride style, weight, and trail conditions.

WheelTire sizeTire pressure
Front90/90-21 54M M+S*100 kPa (1 bar, 15 psi)
Rear130/90-18 69M M+S*100 kPa (1 bar, 15 psi)

* Canada has a different standard tyre that’s 80/100-21 51M up front, and 120/90-18 65M at the rear.

Note: “Tire” is US spelling and “Tyre” is rest-of-world spelling. But pressures are given in all units.

About the 2020+ Yamaha WR450F

The 2020 Yamaha WR450F is an evolution of the previous model that’s similar to the YZ450F, but slightly more suited for the road.

The WR450F continues the spirit of the WR450F that it has had for over a decade — a high-performance, ultra-reliable single cylinder off-road bike that can also be taken on the highway (if you must).

It’s powered by a 450cc liquid-cooled four-stroke DOHC engine running a 13:1 compression ratio. It does have different intake/exhaust systems and a revised ECU compared to the YZ, softening it slightly. You can adjust tuning on the with Yamaha’s Power Tune app for different riding conditions.

Front and rear suspension is competent — fully adjustable, with an inverted fork up front, and ~30cm (12 inches) of travel front and rear. The wet weight is a paltry 120 kg (265 lb) making even the distance-oriented heavier WR450F a real lightweight.

You can use it to hit the trails with your friends in the bush or take it to competitions — the WR450F is a diversely capable bike.

While the YZ450F is a motocross bike built for racing, the WR450F has features that help it last the distance. These includ

  • An engine guard
  • An 18-inch rear wheel
  • 2.2 gallon fuel tank
  • Radiator fan (for when you go slow!)
  • A sealed O-ring chain
  • Fuel level and warning lights
  • Steel rear sprocket
  • Kickstand
  • And of course, running gear in many markets (lights, mirrors etc.)

The Yamaha WR450F is biult to compete with high-performance European endurance bikes like the Husqvarna FE 501 and its Japanese competitor (which came later to the party) the Honda CRF450L.

Manual for the Yamaha WR450F

The above maintenance schedule came from the section in the WR450F.

You can view it in Yamaha’s online manual repository here.

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