S3 Standard Compression GAS Cylinder headGAS-GAS 300 TXT 300 GP - 2017 - 2019Ref : SPART00263A / 1011497

The S3 ST-1065-250-STD cylinder head insert is a specific head insert for GAS GAS trials and motocross bikes, designed to replace the original part while refining engine behavior. A specialist in trial and enduro parts, S3 offers here a standard compression insert aimed at balancing power and traction for more controlled riding.

• Optimized interior design for the combustion chamber: better-directed explosion and easier gas evacuation.
• Improved progressiveness: more torque at low revs and a sharper engine response without tipping into over-compression.
• Reduction of hot spots and lower engine operating temperature for increased thermal reliability.
• Complete package: short NGK spark plug BPMR6A and O-rings included for a simple and clean installation.
• Terrain versatility: a compromise suitable for varied tracks and technical riding.

On the field, this insert is felt at the throttle release: more engine grip at low revs, better control of acceleration, and a bike that remains manageable even when traction needs to be modulated. Suitable notably for GAS GAS TXT 300 GP models (2017-2019).

Manufacturer reference: ST-1065-250-STD — Brand: S3 — Category: Cylinder head inserts (Motocross).