S3 Beta EVO Cylinder Head Insert.
Change the compression of your Beta Cylinder Head, available for the Evo 250 and 300cc trials bikes.
- The primary use of higher compression heads are when riding at high altitude due to the air being less dense, they can also be used to increase the torque of the engine but be careful as raising the compression to much may lead to pre-ignition (pinking) and detonation which can damage your engine, a higher octane fuel may be required to prevent this from happening.
- The low compression head is great for riders who want a soft power delivery, it makes the bike easier to ride especially in slippy muddy conditions. Great for beginner riders.