
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.
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).