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KTM 300 EXC: two-stroke enduro, TPI and what to check on a used one
KTM 300 EXC — the flagship of two-stroke enduro bikes, known for its powerful pull and light weight. We look at how the carburetted and TPI versions differ, who they suit, and what to check when buying used.
300 EXC in brief
300 EXC — a 300 cm³ two-stroke enduro bike suited to both tough terrain and racing. It's renowned for its torque delivery: you can cruise in low gears, and when needed, get a strong acceleration.
In Europe, most EXC versions come with road-legal equipment, but this depends on the specific bike — check the documents and registration before buying.
Generations — what's the difference
Earlier generations of the 300 EXC have a carburettor and require a good understanding of the fuel and oil mix or a separate oil injection system. They're simpler, so they're often chosen by those who enjoy DIY maintenance.
Since 2018, the 300 EXC TPI with fuel injection (TPI — Transfer Port Injection) has hit the market. These bikes don't require mixing oil with fuel, and the engine runs more smoothly, reacting less to altitude and weather conditions.
Engine and gearbox
The engine is a 300 cm³ two-stroke, liquid-cooled, with an electric starter in newer models. It pulls hard in low gears, making it easier to handle than most 250 cm³ rivals.
The gearbox is a manual, multi-speed unit with a hand-operated clutch. Power is delivered to the rear wheel via a chain.
What to check when buying a used 300 EXC
A twin-cylinder engine requires a thorough check: ask when the piston, rings, and connecting rod bearings were last replaced. Regular piston replacement is a normal part of maintenance, so service records and history are very important.
Inspect the frame and suspension for cracks, steering and shock absorber mounts, chain, sprockets, wheel bearings, and the exhaust system. Before buying, rev the engine and listen for any unusual noises.
Trim levels
No trim levels; we provide general descriptions of the variants.
300 EXC (karbiuratorinis)
previous generationClassic twin-cylinder enduro construction.
- Simpler construction
- Often — you need to be well-versed in fuel and oil delivery
- A favourite among enthusiasts
300 EXC TPI
from 2018Version with fuel injection.
- No need to mix oil with fuel
- Smoother engine operation
- Electronic control
300 EXC Six Days
some year versionsTop-of-the-range series, higher-spec version.
- Often — higher-class components
- Special trim
- Higher price
Comparison of variants
| Karbiuratorinis | TPI | Six Days | |
|---|---|---|---|
| Who it's for | For those who like to tinker | For more comfortable and smoother driving | For collectors and enthusiasts |
| Fuel delivery | Carburettor | Fuel injection (TPI) | By model |
| Maintenance | Frequent clutch replacement | Frequent clutch replacement | By model |
| Price in the used market (relatively) | Mid-range | High-end | High-end |
The TPI version is more user-friendly for most buyers, especially if you don't want to mix oil. The carburettor version is a great choice for budget-conscious riders and DIY maintenance.
Pros
- Lightweight and powerful two-stroke
- Strong low-end torque
- No need to mix oil in TPI versions
- Plenty of spare parts and tuning options
Cons
- Two-strokes require frequent piston and other part replacements
- Not all motorcycles come with road-ready equipment
- Cheaper examples can be heavily worn
Frequently asked questions
Is the 300 EXC suitable for beginners?
Due to its powerful torque and weight, it might be too heavy for a beginner. Experienced off-road riders appreciate it for its versatility.
How does the TPI version of the 300 EXC differ from the carburettor version?
In the TPI version, fuel is delivered via injection, so there's no need to mix oil with fuel, and the engine runs more smoothly. The carburettor version is simpler and more affordable.
How often do you need to replace the clutch?
This depends on usage – competitive driving requires more frequent replacement. You'll find precise intervals in the manufacturer's guide, so ask for records when buying.
Updated 2026-10-21 · Trim levels and equipment vary by market and model year — check the equipment of the specific car. · Translated automatically
