KTM 50 SX Race Engine Services
Professional KTM 50 SX engine building. We correct factory squish band issues and blueprint the cylinder porting for maximum off-idle torque and clutch reliability.
The Stock Bottleneck
"Inconsistent off-idle torque causing clutch slippage and heat fade."
The HP Race Dev Solution
"Correcting cylinder height and dome profile to maximize torque at the exact RPM the clutch engages."
We don't just "grind ports." We mathematically correct the engine's geometry to solve this specific flaw.
Engineering the KTM 50 SX Platform
The primary issue with the 50cc platform is the factory squish clearance, which is often loose (>1.2mm). This lacks the compression velocity needed to snap the centrifugal clutch with authority. We machine the cylinder base and re-profile the head to achieve a tight 0.8mm clearance, drastically improving combustion efficiency.
Transfer port heights on the 50 are notoriously mismatched from the factory. We blueprint these to ensure symmetrical timing, allowing the engine to breathe evenly. This eliminates the 'stumble' often felt just before the pipe hits.
Thermal management is critical for the clutch. By increasing engine efficiency and reducing the need to slip the clutch to find power, we lower the overall operating temperature of the transmission oil, preventing fade during long motos.
Select Your Level
Choose the package that fits your racing class.
KTM 50 SX Platform
50cc 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 50 SX Platform
Will porting make the bike harder to ride for a beginner?
No. Our 'Minimum Spec' actually improves rideability by cleaning up the jetting signal. The bike becomes crisp and predictable, rather than boggy and surging.
Do I need a clutch kit with your engine work?
While aftermarket clutches help, our engine work is designed to maximize the efficiency of the stock clutch by delivering power exactly where the shoes engage.