S3 Extreme Cylinder Head (manufacturer part number XTR-B73-300-R): a cylinder head dedicated to motocross riders who want to refine engine response and the look of their 2-stroke. Machined from aluminum and sold individually, its red finish adds a racing touch while remaining lightweight.

• Sharper throttle response: chamber design aimed at a more progressive power delivery.
• Optimized engine behavior at high RPM: improved throttle feel for quick opening phases.
• Better thermal management: geometry reducing common hot spots found on stock cylinder heads.
• Weight reduction and aggressive aesthetics thanks to anodized red aluminum.

Extreme Kit: modifies compression for a smoother power delivery and improved control in technical sections. This cylinder head is aimed at demanding riding styles seeking more traction and better progression without compromising mechanical reliability.

Features: sold individually, red color, aluminum material. Main compatibility (examples): BETA XTRAINER 300 2T (2023), BETA RR 300 2T RACING (2023), BETA RR 300 2T (2023).