S3 Power Cylinder headRef : SPART00009A / 1123545

The S3 Power cylinder head (ref. PWR-B73-300-R) is aimed at motocross riders looking to enhance the responsiveness and engine behaviour of their 300 2T. Machined from aluminium and painted red, it replaces the original part while providing a racing look and a performance-oriented design.

Practical advantages:

• Promotes a sharper throttle response thanks to optimised chamber geometry
• Contributes to a more pronounced rev-up and smoother rotation
• Lightweight design that helps reduce unsprung mass

Designed to accommodate Power Kit-type modifications, this cylinder head can alter the compression ratio to adapt engine behaviour according to settings and altitude. Its finish and machining also aim to limit hot spots for improved thermal dissipation, without promising specific figures.

Specifications:

• Packaging: single unit
• Colour: red
• Material: aluminium
• Manufacturer reference: PWR-B73-300-R

Main compatible models: BETA XTRAINER 300 2T (2026), BETA RR 300 2T (2024) and BETA RR 300 2T RACING (2023). Part intended for motocross use and engine modifications — installation and adjustments recommended by a professional.