TM 300 [1997 – 2021]: A Legacy of Italian Two-Stroke Mastery

For over two decades, the TM 300 has been a cult favorite among hardcore motocross and enduro riders. This Italian-built two-stroke isn’t just a motorcycle – it’s a statement. While mainstream manufacturers shifted focus to four-strokes, TM Racing doubled down on refining their 300cc two-stroke formula, creating a machine that feels both raw and precisely engineered. Having recently thrown a leg over a well-maintained 2019 MX 300 Fi model, I can confirm this bike isn’t just keeping the two-stroke dream alive – it’s rewriting the rules.

Engine Performance: Two-Stroke Thunder, Modern Refinement

At the heart of the TM 300 beats a 294cc liquid-cooled two-stroke engine that’s been progressively refined since 1997. The square 72mm x 72mm bore/stroke ratio creates an unusually broad powerband for a 300cc two-stroke. From idle to redline, there’s a relentless surge of torque that feels more like a four-stroke’s linear delivery – until you hit the midrange, where classic two-stroke aggression takes over.

Key features that elevate this powerplant: - V-Force Reed Valve: Provides crisp throttle response across the RPM range - Keihin PWM 38 Carburetor (or Fi injection on later models): Delivers precise fuel metering - Selectable Ignition Maps: A handlebar-mounted switch alters power delivery between “soft” for technical terrain and “aggressive” for track use

The kickstart-only ritual (on most models) feels appropriately old-school, but the engine lights up with minimal effort. What surprises most riders is the tractability – you can lug the engine down to walking speed in third gear, then scream it to the limiter without a hint of hesitation. Fuel capacity ranges from 7.5L (1.98 gal) on MX models to 9.5L (2.51 gal) on enduro versions, giving respectable range for a thirsty two-stroke.

Chassis & Handling: Precision Tool or Brutal Weapon?

TM’s signature perimetral aluminum frame is a work of art – laser-cut and hand-welded in Italy. The design prioritizes torsional rigidity while allowing controlled flex, creating a bike that carves ruts like a surgeon’s scalpel yet remains stable at speed. At 107kg (236 lbs) dry weight, it’s not the lightest 300cc MX bike, but the mass centralization makes it feel agile.

Handling highlights: - Adjustable Geometry: Multiple engine mounting positions and linkage ratios let riders tailor handling - KYB/USD Forks (48mm on later models): Plush initial stroke with progressive damping - TM Racing Rear Shock: Firm yet communicative, excellent for aggressive riders

The cockpit feels purposefully cramped, putting you “in” the bike rather than “on” it. Combined with the narrow fuel tank design, this allows extreme body positioning – crucial when wrestling 48hp through technical terrain.

Suspension & Brakes: Track-Ready Out of the Box

While Japanese manufacturers often spec softer suspension for broader appeal, TM ships their MX models with track-ready setups: - Front: KYB 48mm USD forks with 310mm (12.2”) travel - Rear: TM Racing shock with 320mm (12.6”) travel and high/low-speed compression adjust

The Nissin/Brembo brake combo delivers: - Front: 245mm (9.6”) wave rotor with twin-piston caliper - Rear: 220-245mm (8.7-9.6”) wave rotor

Bite is ferocious yet controllable – a necessity when managing the engine’s explosive power. Brake pads last longer than expected thanks to wave rotors’ superior heat dissipation.

Competition: How the TM 300 Stacks Up

Compared to segment rivals: - KTM 300 XC-W: More beginner-friendly power delivery but lacks TM’s track precision - Husqvarna TE 300: Comparable suspension but 15% heavier feel in technical sections - Beta 300 RR: Smoother low-end but can’t match TM’s top-end scream

Where the TM 300 dominates: - Customization: Hand-built nature allows bespoke tuning from factory - Durability: Forged (not cast) components throughout the drivetrain - Resale Value: Low production numbers (under 2,000 units/year) create collector demand

Maintenance: Keeping the Italian Stallion Healthy

TM’s race-bred design demands disciplined maintenance: 1. Engine Rebuilds: Every 80-100 hours for top-end (piston/rings) 2. Oil Mixing: 3.5% ratio (35ml oil per 1L fuel) using JASO-FD certified oils 3. Air Filter Service: Clean every 15 hours (critical with Keihin’s vacuum-operated carb)

Recommended MOTOPARTS.store Upgrades: - High-Compression Pistons: Extend rebuild intervals - Titanium Exhaust Systems: Save 3kg+ while improving scavenging - Adjustable Brake Levers: Fine-tune reach for varied terrain

Conclusion: The Last True Two-Stroke Warrior

Riding the TM 300 is an experience that modern four-strokes can’t replicate – the smell of castor oil, the mechanical symphony of a tuned expansion chamber, and the thrill of controlling 48hp with nothing but rider skill. While it demands respect (and regular wrenching), few bikes deliver this level of connection between man and machine.

For TM 300 owners looking to elevate their ride, MOTOPARTS.store offers: - OEM-spec rebuild kits - Suspension tuning services - Custom graphics kits honoring TM’s racing heritage

This Italian icon proves that in the right hands, two-strokes aren’t just surviving – they’re thriving.

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Specifications sheet

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