TM MX 250 (1996-2015): A Two-Stroke Motocross Legend Revisited

Introduction

When you hear the throaty bark of a two-stroke engine echoing across a motocross track, it’s hard not to feel a primal surge of adrenaline. The TM MX 250, produced from 1996 to 2015, embodies this raw spirit of motocross. Hailing from Italy’s TM Racing—a brand synonymous with hand-built precision—this bike isn’t just a machine; it’s a statement. Designed for riders who crave exclusivity and race-ready performance, the MX 250 carved its niche in an era dominated by Austrian and Japanese giants. Climb aboard, and let’s explore why this Italian underdog still commands respect.

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Engine Performance: The Heart of a Beast

At the core of the TM MX 250 lies a 249cc liquid-cooled two-stroke engine, a configuration that delivers instant power and a visceral riding experience. The bore and stroke (66.4 mm x 72 mm) strike a balance between torque and rev-happy aggression. Fitted with a Keihin PWK 38 carburetor—a staple in later models—the engine responds crisply to throttle inputs, with a hit that’s more controlled than abrupt.

Compression ratios vary between 15.5:1 and 17.2:1 across generations, reflecting TM’s tinkering for optimal power delivery. On the track, this translates to a broad powerband that pulls hard from mid-range, making it forgiving for less experienced riders yet explosive enough for experts. The 5-speed gearbox (6-speed in early models) is precise, though shifting requires a deliberate click—no vague neutrals here.

What stands out is the engine’s tunability. The Kokusan CDI ignition system with selectable maps (on post-2008 models) lets riders toggle between aggressive and smoother curves—a rarity in carbureted two-strokes. Add the V-Force reed valve, and you get sharper throttle response, especially when exiting corners.

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Handling and Suspension: Precision Meets Passion

TM’s obsession with chassis dynamics shines in the MX 250. Early models used a chromium-molybdenum steel frame, offering flex for traction and durability. By the mid-2000s, TM transitioned to a perimeter aluminum frame, shedding weight and sharpening steering. The difference is palpable: the aluminum frame communicates every terrain nuance, while the steel variant feels more planted at speed.

Suspension setups evolved over the years. Marzocchi USD forks (50mm in later models) dominate the front, with optional Ohlins upgrades for those seeking buttery compliance. Out back, Sachs shocks handle standard duties, but again, Ohlins lurks as a premium option. On rough tracks, the Sachs can feel busy under hard landings, but it’s far from harsh. Swap to Ohlins, and the bike transforms—soaking up braking bumps while staying composed during aggressive corner exits.

At 96 kg (212 lbs) dry, the MX 250 feels featherlight. Flicking it through rhythm sections or whipping around berms requires minimal effort. The 21-inch front wheel (100/90-21 tire) and 19-inch rear (110/90-19) provide predictable grip, though serious racers will upgrade to modern rubber.

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Brakes and Wheels: Stopping Power, Italian Style

TM didn’t cut corners here. Wave-style Braking discs (245mm front/rear) paired with Nissin calipers offer strong, progressive bite. Unlike some competitors’ wooden-feeling levers, the MX 250’s brakes modulate effortlessly—critical for late-brake dives into corners. Spoked wheels with blue rims (post-2010) add a dash of flair, though durability in extreme conditions may warrant aftermarket reinforcements.

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Competition: How the TM Stacks Up

The MX 250’s rivals—KTM 250 SX, Yamaha YZ250, and Husqvarna CR250—are formidable. Here’s where the TM shines:
- Customization: While KTM and Husqvarna offer turnkey race bikes, TM’s modular design (e.g., optional Ohlins suspension) appeals to tinkerers.
- Exclusivity: You won’t see a TM at every track. Its hand-built craftsmanship attracts riders wanting to stand out.
- Engine Character: Compared to the YZ250’s brute-force powerband, the TM feels more refined, with a linear delivery that rewards technical riding.

Where it lags: Parts availability. TM’s boutique production means aftermarket support is essential—something MOTOPARTS.store specializes in.

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Maintenance: Keeping the Italian Fire Alive

Owning a two-stroke demands diligence. Here’s your TM care checklist:
1. Top-End Rebuilds: Every 30-40 hours for pistons/rings. Opt for forged pistons (Wössner or Vertex) for longevity.
2. Carb Tuning: Clean the Keihin PWK 38 regularly. Jet kits from MOTOPARTS.store help adapt to altitude or fuel changes.
3. Suspension Service: Rebuild Sachs/Olins shocks annually. Upgrade bushings if you’re chasing milliseconds.
4. Air Filter Care: Foam filters need oiling after every ride—critical in dusty conditions.
5. Brake Upgrades: Swap to braided steel lines for firmer lever feel.

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Conclusion: A Timeless Motocross Icon

The TM MX 250 isn’t just a bike; it’s a rebellion against mass-produced monotony. Its combination of razor-sharp handling, tunable engine, and Italian flair makes it a cult classic. While newer bikes boast EFI and traction control, the MX 250 reminds us why raw, mechanical connection matters. Whether you’re resurrecting a 2004 model or fine-tuning a 2015 gem, MOTOPARTS.store has the upgrades to keep your TM shredding for another decade.

Ride hard. Stand out.

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Specifications sheet

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