GAS GAS MC 450 F [2021–2023]: A Rider’s Perspective on the Spanish Off-Road Beast
Introduction
The GAS GAS MC 450 F, part of the Spanish brand’s aggressive push into the competitive off-road and motocross segment, is a machine that demands attention. From 2021 to 2023, this model generation carved its niche with a blend of lightweight agility, raw power, and rally-bred DNA. Whether you’re tackling motocross tracks, enduro trails, or even dabbling in rally racing (courtesy of the limited-edition RX 450F Replica), this bike is engineered to thrill. Having spent time throwing this machine around both tight woods and open desert-like terrain, here’s my take on what makes it stand out—and where it leaves room for customization.
Engine Performance: Precision and Punch
At the heart of the MC 450 F lies a 449.9cc single-cylinder four-stroke engine, producing 62 PS (46 kW). The bore and stroke (95.0 x 63.4 mm) are classic big-bore specs, favoring high-revving power delivery. What’s immediately noticeable is the engine’s responsiveness. The Keihin fuel injection system eliminates any hesitation off the throttle, whether you’re blasting out of corners or climbing technical hills.
The DOHC configuration (on most variants) and titanium valves keep the engine breathing efficiently, while the Brembo hydraulic clutch ensures smooth engagement even during aggressive shifts. On the RX 450F Replica, the rally-tuned EMS adjusts power delivery per gear—think explosive top-end in higher gears and controllable torque in first and second. It’s like having multiple personalities, all of them useful.
Key Highlights:
- DDS Clutch: The Dampened Diaphragm Steel clutch (paired with Brembo hydraulics) is virtually bulletproof. Even after hours of slipping through muddy ruts, it never faded.
- Akrapovič Exhaust: Standard on the Replica, this system isn’t just about the throaty growl—it shaves weight and optimizes backpressure for relentless acceleration.
- Liquid Cooling: Critical for endurance. Even in 35°C (95°F) heat, the radiators kept temps stable during sustained high-RPM runs.
Chassis and Handling: Agile Meets Stable
The chromoly steel frame is a masterpiece. On the MC 450F, it’s a central double-cradle design, while the RX Replica uses a trellis setup with calculated flex. Both prioritize stiffness where needed (for cornering precision) and compliance elsewhere (to absorb square-edged hits). Paired with WP suspension—XACT-USD forks up front and XACT monoshock rear—the bike floats over rocks and roots.
Suspension Specs:
- Front Travel: 310 mm (12.2 inches)
- Rear Travel: 300 mm (11.8 inches)
The RX Replica’s WP XPLOR PRO 7548 fork and Pro-Lever linkage are rally-spec upgrades, offering plush initial travel and progressive damping for high-speed stability. On motocross tracks, the standard MC 450F’s setup feels more rigid, favoring sharp cornering over desert glide.
Braking is handled by Brembo, with a 220–240 mm rear disc and a 260 mm front (300 mm on the Replica). The bite is strong but manageable—no sudden lockups mid-corner.
Ergonomics and Comfort: Built for Battle
At 950 mm (37.4 inches), the seat height is tall but typical for the segment. The RX Replica’s slim bodywork and rally-inspired ergonomics let you shift weight effortlessly, crucial for standing sprints over dunes. The standard MC 450F’s seat is firmer, optimized for motocross-style bursts rather than all-day comfort.
Fuel Capacity Quirks:
- Motocross Models: 7.0 liters (1.85 gallons)—enough for a 30–45 minute moto.
- RX Replica: A massive 35 liters (9.25 gallons) tank integrated into the subframe. Rally-ready, but heavy when full.
The handlebar position feels neutral, and the Neken bars (on the Replica) dampen vibration well. Still, aftermarket grips or bar risers could personalize the setup for longer rides.
Competition: How It Stacks Up
The MC 450 F faces fierce rivals in the 450cc off-road segment:
- KTM 450 SX-F: Similar weight and power, but KTM’s PDS rear suspension lacks the linkage-based predictability of the GAS GAS. KTM edges ahead in aftermarket support, though.
- Honda CRF450R: More beginner-friendly with smoother power delivery, but heavier at 106 kg (234 lbs). The GAS GAS feels nimbler in tight singletrack.
- Husqvarna FE 450: Shares DNA with GAS GAS (same parent company) but uses a composite frame. Subjective choice—Husky riders swear by the vibes; GAS GAS loyalists love the steel frame’s feedback.
Where the GAS GAS Shines:
- Rally-Ready Variants: The RX 450F Replica is in a league of its own for rally enthusiasts.
- Brembo Clutch/Brakes: More consistent than Braktec components on earlier models.
Maintenance: Keeping the Beast Alive
Key Tips for Owners:
- Oil Changes: Use SAE 10W-50 MA2 (1.1L without filter, 1.2L with). Every 15–20 hours for hard riding.
- Air Filter: Clean every 2–3 rides—critical for the high-compression engine. Consider a pre-oiled aftermarket filter for convenience.
- Chain Maintenance: The 520 X-ring chain needs regular lubrication. Upgrade to a DID Gold series for longevity.
- Coolant: Replace annually with ethylene glycol-based fluid. The RX Replica’s integrated system is efficient but demands vigilance in dusty conditions.
- Brake Fluid: DOT 4/5.1. Flush yearly to prevent moisture buildup.
MOTOPARTS.store Recommendations:
- Sprocket Kits: Swap the stock steel sprocket for an aluminum/Titanium hybrid to save weight.
- Skid Plates: Essential for rocky terrain.
- Suspension Upgrades: Re-valve the WP units for your weight/riding style.
Conclusion: A Worthy Contender
The GAS GAS MC 450 F [2021–2023] is a testament to the brand’s off-road pedigree. It’s not just a KTM clone—it carves its own identity with a steel frame, Brembo dominance, and rally-bred variants that scream specialization. While the seat height and aggressive power delivery might intimidate novices, seasoned riders will appreciate its razor-sharp reflexes. And with strategic upgrades from MOTOPARTS.store, this bike can transform from a stock weapon to a personalized champion.
Whether you’re roosting through berms or navigating a Dakar-style stage, the GAS GAS MC 450 F generation delivers a ride that’s as raw as it is rewarding. Now, go get yours dirty—and keep our parts department on speed dial.
Specifications sheet
| Engine | |
|---|---|
| Stroke: | Four-stroke |
| Max power: | 46 kW | 62.0 hp |
| Fuel system: | Fuel Injection |
| Displacement: | 450 ccm |
| Fuel control: | DOHC |
| Bore x stroke: | 95.0 x 63.4 mm (3.7 x 2.5 in) |
| Configuration: | Single |
| Cooling system: | Liquid |
| Lubrication system: | Forced oil lubrication with 2 oil pumps |
| Number of cylinders: | 1 |
| Valves per cylinder: | 4 |
| Dimensions | |
|---|---|
| Wheelbase: | 1490 mm (58.7 in) |
| Dry weight: | 100 |
| Seat height: | 950 mm (37.4 in) |
| Overall width: | 830 mm (32.7 in) |
| Overall height: | 1260 mm (49.6 in) |
| Overall length: | 2200 mm (86.6 in) |
| Ground clearance: | 370 mm (14.6 in) |
| Fuel tank capacity: | 7.0 L (1.85 US gal) |
| Drivetrain | |
|---|---|
| Chain type: | 520 X-Ring |
| Final drive: | chain |
| Transmission: | 5-speed, DDS wet multi-disc clutch (Brembo/Braktec hydraulics) |
| Maintainance | |
|---|---|
| Rear tire: | 140/80-18 |
| Engine oil: | 10W-50 MA2 |
| Front tire: | 90/90-21 |
| Break fluid: | DOT 4 / 5.1 |
| Engine oil change interval: | 100 hours (extended service intervals per rally specs) |
| Additional Features | |
|---|---|
| Wheels: | Excel rims with wire spokes |
| Electrical: | Lithium-ion battery, 2 Ah |
| Special components: | Titanium valves, Akrapovič exhaust (Factory Edition), traction/launch control (Factory Edition) |
| Chassis and Suspension | |
|---|---|
| Frame: | Central double-cradle-type 25CrMo4 steel |
| Rear brakes: | Single 220-240 mm disc, 1-piston caliper |
| Front brakes: | Single 220-240 mm disc, 2-piston caliper |
| Rear suspension: | WP XACT Monoshock with linkage (adjustable) |
| Front suspension: | WP XPLOR-USD, Ø 48 mm (adjustable) |
| Rake (fork angle): | 26.1° |
| Rear wheel travel: | 300 mm (11.8 in) |
| Front wheel travel: | 310 mm (12.2 in) |
