Husqvarna FC 450 — OEM Fluid, Tire Pressure & Maintenance Specs
449.9cc Liquid-Cooled Single SOHC 4-Valve 63 hp MX1 · Source: Husqvarna FC 450 (2019–Present) Official Owner’s Manual Maintenance Specifications
According to the Husqvarna FC 450 (2019–Present) Official Owner’s Manual Maintenance Specifications, the 2019–Present Husqvarna FC 450 (chassis VBKFCA43/HQV-FC450) requires 0.95 L (1.00 US qt) of SAE 10W-50 (JASO MA2, Motorex Cross Power / Power Synt 4T) engine oil for a drain-only change and 1.1 L (1.16 US qt) with filter service (77338005100 / HF652 (+ Dual Screens)). Standard solo cold tire pressure is 105 kPa / 1.05 bar / 15 PSI front (80/100-21) and 105 kPa / 1.05 bar / 15 PSI rear (120/80-19), paired with 1× NGK LMAR9AI-8 / LKAR8AI-9 spark plug(s) and a HJTZ5S-FP (LiFePO4) / YTZ10S battery.
Drain only: 0.95 L (1.00 US qt)
R 105 kPa (1.05 bar)
Est. Range: ~137 km (85 mi)
1. Engine Lubrication, Filter & Clutch Specifications
| Clutch Architecture | Wet Multi-Plate Manual Clutch NEVER use JASO MB |
|---|---|
| Recommended Viscosity & Grade | SAE 10W-50 (Alt: SAE 10W-60 (LC4 690/701)) · JASO MA2 · Motorex Cross Power / Power Synt 4T |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 0.95 L (1.00 US qt) • With filter/strainer: 1.1 L (1.16 US qt) • Complete dry overhaul: 1.25 L (1.32 US qt) |
| OEM Oil Filter Code & Type | 77338005100 / HF652 (+ Dual Screens) |
| Correct Oil Level Check Method | Hold bike upright on level ground 3–5 min after warm shutdown; read crankcase sight glass |
| Oil Drain Bolt Torque | 20 N·m (14.8 lb-ft / 2.04 kgf·m) — Use fresh crush washer |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 80/100-21 · Rear: 120/80-19 (Tube-Type Spoke Rim) |
|---|---|
| Cold Tire Pressure — Solo Riding |
Front: 105 kPa / 1.05 bar / 15 PSI Rear: 105 kPa / 1.05 bar / 15 PSI |
| Cold Tire Pressure — 2-Up / Loaded Touring |
Front: 115 kPa / 1.15 bar / 17 PSI Rear: 115 kPa / 1.15 bar / 17 PSI |
| OEM Spark Plug & Quantity | NGK LMAR9AI-8 / LKAR8AI-9 × 1 (Gap: 0.8 mm) |
| OEM Battery Code & Rating | HJTZ5S-FP (LiFePO4) / YTZ10S (12V Lithium / AGM) |
| Final Drive Maintenance | 520 Sealed X-Ring Chain — Maintain 25–35 mm slack and clean/lubricate regularly |
| Brake Fluid & Coolant | DOT 4 or DOT 5.1 · OAT ethylene-glycol coolant for aluminum radiators (50:50 premix) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 450 cc · 63 hp @ 9,500 rpm · 52 N·m (38.4 lb-ft) @ 7,500 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 943 mm (37.1 in) · 108 kg (238 lbs) |
| Fuel Tank & Est. Real-World Range | 7.2 L (1.9 US gal) · ~19 km/L → ~137 km (85 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 500 km • Engine Oil / Filter: 2,500 km / 2,500 km • Air Filter / Spark Plug: 2,500 km / 10,000 km • Valve Clearance Check: 5,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
Flagship 63 hp motocrosser featuring 10 mm lowered WP XACT suspension for lower center of gravity, Brembo hydraulic clutch, and sensorless up-quickshifter.
Oil & Clutch Mechanical Engineering Note
KTM/Husqvarna 4-stroke EXC-F / FE & LC4 690/701 platform requiring dual oil-screen cleaning and frequent Motorex JASO MA2 synthetic oil service.