KTM 300 EXC TPI (2017-2020): The Ultimate Enduro Weapon Tested

Introduction

The KTM 300 EXC TPI (2017-2020) isn’t just a dirt bike—it’s a statement. As the first production two-stroke enduro motorcycle with fuel injection, this generation rewrote the rules of off-road performance. Designed for riders who demand relentless power, razor-sharp handling, and bulletproof reliability in extreme terrain, the 300 EXC TPI became an instant legend. After spending days thrashing it through rocky trails, muddy hill climbs, and tight single-track, here’s why this bike remains a benchmark for hardcore enduro enthusiasts.

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Engine & Power Delivery: Two-Stroke Revolution

At the heart of the KTM 300 EXC TPI lies its 293.2cc two-stroke engine, now equipped with the groundbreaking Transfer Port Injection (TPI) system. Unlike traditional carbureted two-strokes, the TPI eliminates premixing fuel while delivering crisp throttle response across the entire RPM range.

Key Takeaways:
- Controlled Fury: The TPI system ensures smooth low-end torque that’s almost four-stroke-like, making it impossible to stall on technical climbs. Yet, when you crack the throttle wide open, it unleashes a visceral mid-to-top-end rush that’s pure two-stroke adrenaline.
- No Jetting, No Problems: Ride from sea level to high-altitude mountain passes without touching a carburetor screw. The Continental/Synerject EMS auto-adjusts fueling, a game-changer for adventure riders.
- Electric Start Dominance: While earlier models retained a kickstarter (2017-2019), the 2020 model went electric-only—a controversial but practical move given the system’s reliability.

By the Numbers:
- Peak Power: ~50 HP (estimated)
- Fuel Efficiency: 2.79 L/100 km (84.3 MPG) – exceptional for a 300cc two-stroke.
- Weight: 103 kg (227 lbs) dry – lighter than most 450cc four-strokes.

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Chassis & Handling: Precision Meets Brutality

KTM’s chromoly steel frame and WP XACT suspension form a chassis that’s both forgiving and razor-sharp.

Frame Dynamics:
- Flex-Tuned Rigidity: The frame absorbs trail chatter but remains precise during aggressive cornering. Laterally mounted engine head stays reduce vibrations, a blessing during marathon rides.
- Ground Clearance: 370 mm (14.6") lets you glide over logs and rocks without a second thought.

Suspension Setup:
- Front: The 48mm WP XACT-USD fork offers 300 mm (11.8") of travel. Adjustable compression/rebound lets you dial in plushness for rocks or stiffness for MX-style jumps.
- Rear: The WP XACT monoshock (310 mm/12.2" travel) pairs with a linkage-less PDS system. Purists argue it’s simpler and lighter; others miss the tunability of a linkage. Either way, it eats up harsh landings.

Handling Verdict:
Flickable in tight woods yet stable at speed, the 300 EXC TPI dances between agility and composure. The 63.9° head angle and 1,482 mm wheelbase strike a perfect balance for enduro versatility.

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Ergonomics & Comfort: Built for War

KTM’s "Ready to Race" ethos shines in the cockpit:
- Seat Height: 960 mm (37.8") is towering for shorter riders but provides leverage for standing attacks. Aftermarket low seats are a popular MOTOPARTS.store upgrade.
- Handlebar Setup: The Neken aluminum bar (standard bend) offers a neutral riding position. We’d swap in a vibration-damping grip for multi-hour rides.
- Fuel Capacity: 9.0 liters (2.38 gal) gives ~100 km (62 mi) range – sufficient for enduro loops but consider a larger tank for adventure use.

Standout Feature: The tool-less air filter access is genius. After a mud bath, swapping filters takes 30 seconds—no screwdrivers needed.

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Competition: How It Stacks Up

1. Husqvarna TE 300i

• Similarities: Same TPI engine, identical suspension travel.
• Differences: Husky’s composite subframe and Pro Taper bars offer minor ergonomic tweaks. The KTM feels marginally more aggressive in power delivery.
• Verdict: Choose based on dealer proximity or color preference (Husky’s white vs. KTM’s orange).

2. Beta 300 RR

• Strengths: Softer power curve, lower seat height (935 mm/36.8"), better for technical trail riders.
• Weaknesses: Carbureted (until 2021), heavier at 108 kg (238 lbs).
• Verdict: Beta suits finesse riders; KTM dominates in outright speed.

3. Yamaha YZ250X

• Strengths: Legendary reliability, $2k cheaper.
• Weaknesses: Carbureted, no electric start, harder-hitting powerband.
• Verdict: A budget pick for MX-trained riders; outdated vs. TPI tech.

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Maintenance: Keeping the Beast Alive

The 300 EXC TPI is low-maintenance but demands attention to key areas:

1. TPI System Care

• Injectors: Clean annually with ultrasonic tools (available at MOTOPARTS.store).
• Oil Pump: Use only JASO FD-certified injector oil (e.g., Motorex CrossPower 2T).

2. Suspension Service

• Forks: Rebuild every 80-100 hours. Upgrade to SKF seals for muddy conditions.
• Shock: Nitrogen recharge every 50 hours maintains consistent damping.

3. Exhaust Upgrades

The stock HD pipe is durable but heavy. Swap in an FMF Gnarly for weight savings + torque gains.

4. Top-End Rebuilds

• Interval: 150-200 hours for recreational riders. Pistons and gaskets are a MOTOPARTS.store bestseller.

5. Critical MOTOPARTS.store Recommendations:

• Air Filters: Twin Air Dual-Stage filters for extreme dust.
• Brake Pads: Sintered Brembo pads for aggressive downhill control.
• Chain Kits: DID 520ERT3 Gold for longevity.

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Conclusion: Why It Still Dominates

The KTM 300 EXC TPI (2017-2020) is a rare machine that combines cutting-edge tech with raw two-stroke soul. Whether you’re clawing up a root-infested hill or blitzing a desert wash, it rewards skill and punishes complacency—exactly what enduro riders crave. While newer models have emerged, this generation remains a used-market darling and a testament to KTM’s engineering audacity.

Ready to personalize yours? MOTOPARTS.store has everything from performance pipes to grippy footpegs—because even legends can level up.

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Specifications sheet

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