KTM 250 SX Platform
Big bore two-strokes aren't about lacking power; they're about managing it. For the 250SX rider, we focus on broadening the hit to create a '450-killer' weapon. For the 300 XC/Enduro rider, our focus shifts to 'Linear Torque.' We reshape the power valve and transfer ports to eliminate the violent 'hit,' turning your 2-stroke into a traction-finding tractor that creates grip where others spin.
The Stock Bottleneck
"Factory limitations holding you back."
The HP Race Dev Solution
"Engineered performance."
We don't just "grind ports." We mathematically correct the engine's geometry to solve this specific flaw.
Select Your Level
Choose the package that fits your racing class.
KTM 250 SX Platform
250cc PlatformMinimum Spec
Reliability, clean-up, throttle response. The entry-level fix.
- •Cylinder Truing & Casting Cleanup
- •Power Valve Mechanism Check & Calibration
- •Deck Height Verification
Recommended For
Local Racing & Practice Bikes
Privateer Spec
The sweet spot. High performance, durable enough for a full season.
- •Stage 2 Cylinder Porting
- •Cylinder Head Machining (Squish & Combustion Chamber)
- •Exhaust Port Polishing
- •Carburetor Taper Bore
Recommended For
Regional Championships & Competitive Stock Class
Factory Works Spec
No compromise. Maximum power, exotic coatings, extensive labor.
- •Stage 3 Full Race Porting
- •Engine Case Matching (Blueprinting)
- •Ceramic Coatings (Piston Crown & Combustion Chamber)
- •ISF Process Transmission Tumbling
- •Dynamically Balanced Crankshaft
Recommended For
Loretta Lynn's, Mini Os, Pro Nationals
Common Questions: KTM 250 SX Platform
Can you make my 250SX smoother for woods riding?
Yes. We use a different head profile (lower compression ratio) and conservative exhaust port timing to make the bike tractable in low-grip situations.
Why balance the crank on a 300?
The heavy piston of a 300 creates significant vibration. Balancing the crank assembly not only saves your hands from numbness but frees up horsepower lost to parasitic shaking.