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Factory Workshop SpecificationsPlatform Gen: 2018–2024

2018 Yamaha YZ450F Motocross Specifications & Consumables

Official workshop technical reference: fluid capacities, spark plug codes, drive chain specs, and tire inflation pressures.

Technical PassportOEM VERIFIED
Engine
450cc
Cooling
Liquid-Cooled
Final Drive
520 Chain
Engine Oil
0.90 L (0.95 US qt)
Spark Plug
NGK LMAR9E-J
Front Tire
80/100-21
Gen 2018–2024

Factory Platform Compatibility: All workshop fluid capacities, maintenance milestones, torque specifications, and consumables on this specification sheet are factory-identical across model years 2018 through 2024.

Select Model Year:(Active: 2018)
7 Production Years (2018–2024)

Engineering Subsystem Workbenches & Calculators

Dedicated deep-dive diagnostic tools, torque matrices, wiring pinouts, and calculators tailored for 2018 Yamaha YZ450F Motocross.

10 Dedicated Engineering Spoke Pages
Subsystem Guide/torques

Fastener Torques

Engine drain plug, axle spindles, caliper mounts, triple clamp pinch bolts & thread lubrication derating guide.

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Subsystem Guide/fluids

Fluids & Capacities

Oil: 0.90 L (0.95 US qt) • Coolant: 1.00 L (1.06 US qt) • Brake: DOT 4

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Subsystem Guide/fuses-relays

Fuses & Relays

Main: 30A Blade • Location: N/A

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Subsystem Guide/compression

Compression & Leakdown

Ratio: 13.0:1 • Std: 170-215 PSI • Limit: 135 PSI

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Subsystem Guide/valves

Valve Clearances

Intake: N/A mm • Exhaust: N/A mm

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Subsystem Guide/fuel-delivery

Fuel Delivery & TB Sync

Idle: N/A • Rail Pressure: N/A • Vacuum: N/A

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Subsystem Guide/electrical

Charging & Battery

Battery: BTZ7S • CCA: 130 • Regulated: 14.2 - 14.8 V DC (at 5,000 RPM with High Beam)

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Subsystem Guide/tires

Tires & Gearing

Front: 80/100-21 • Rear: 120/80-19

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Subsystem Guide/suspension

Suspension & Sag

Front Travel: 310 mm • Rear Travel: 317 mm

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Subsystem Guide/maintenance

Maintenance Schedule

Oil: Every 5–10 engine run hours (competition) mi • Valves: N/A • Plugs: Every 20 engine run hours mi

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Fluids & Service Capacities
Shop Fluids →
Engine Oil (Drain & Filter Change)0.90 L (0.95 US qt)
Engine Oil (Drain Only)0.85 L (0.90 US qt)
Recommended Oil Viscosity10W-40 Yamalube 4R, JASO MA
Coolant System Capacity1.00 L (1.06 US qt)
Brake Fluid StandardDOT 4
Drivetrain, Chain & Gearing
Drive Chain Pitch520
Chain Link Count114 Links
Front Sprocket Teeth13T
Rear Sprocket Teeth48T
Final Drive Configuration520 Pitch Chain
Ignition & Electrical Specifications
Shop Plugs & Batteries →
OEM Spark Plug Part NumberNGK LMAR9E-J
Electrode Spark Plug Gap0.8 - 0.9 mm (0.031 - 0.035 in)
OEM Battery Reference CodeBTZ7S
Battery Output & Rating12V 2.0Ah (Lithium) 130 CCA
Spark Plug Inspection Interval20 engine run hours miles
Wheels, Tires & Inflation Pressures
Front Tire Dimensions80/100-21
Cold Front Inflation Pressure14 PSI (Cold)
Rear Tire Dimensions120/80-19
Cold Rear Inflation Pressure14 PSI (Cold)
OEM Wheel Rim Widths (F / R)3.50" / 5.50"
Verified OEM Wheel Fitment: 80/100-21 (F) + 120/80-19 (R)
Shop In-Stock Matched Pairs→

Official NHTSA Safety Recalls & Technical Bulletins

0 Open Campaigns (Clean)
U.S. Department of Transportation compliance database (Title 49 U.S.C. Chapter 301).
Verify VIN on NHTSA.gov
No Active Federal Safety Recalls Reported
The U.S. DOT National Highway Traffic Safety Administration (NHTSA) records zero open safety recall campaigns for the 2018 Yamaha YZ450F Motocross platform. Always check your individual 17-digit VIN at an authorized dealership or via NHTSA.gov for individual recall completions.
1-Click Factory Service KitOEM Spec Fluid Capacities Matched

Workshop Maintenance Kit & Factory Fluids

Authentic factory-grade motor oil, oil filter, and high-temp brake fluid matched precisely to 2018 Yamaha YZ450F Motocross capacities.

Full Kit Subtotal
$74.50
Silkolene Pro 4 4T Synthetic Oil 10W-40 (4 Liter)
10W-40 JASO MA2

Silkolene Pro 4 4T Synthetic Oil 10W-40 (4 Liter)

4-Liter Factory Full Jug
Matches factory 10W-40 spec (Oil spec: 0.90 L (0.95 US qt))
Item Price
$68.95
EBC High-Performance DOT 4 Synthetic Brake Fluid
DOT 4 Synthetic Formula

EBC High-Performance DOT 4 Synthetic Brake Fluid

8.8 oz (250 ml) Workshop Bottle
Meets & exceeds factory DOT 4 specifications
Item Price
$5.55
Factory OEM Spark Plug Spec

NGK LMAR9E-J

Gap: 0.8 - 0.9 mm (0.031 - 0.035 in)
Inspection milestone: 20 engine run hours miles. Exact factory part specification.
Authentic OEM Reference
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Complete Workshop Maintenance Package3 Essential Service Items
Includes 10W-40 JASO MA2 engine oil (4-Liter Factory Full Jug), high-flow filter & DOT 4 fluid.
Kit Total
$74.50

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2018 Yamaha YZ450F Motocross Factory Workshop Specs & Maintenance Guide | WowShopper | WowShopper Motorsports