VHM head insert KTM 300 EXC / 300 XC-W Husqvarna TE 300 / GasGas EC 300 24-26 – G 28.50 cc

Exchangeable combustion chamber (insert) for the VHM cylinder head AA33215. Chamber volume 28.50 cc. 🔴 The insert fits ONLY the VHM head AA33215 — it cannot be fitted into the OEM head. For the stock (OEM) piston. Compared with the VHM standard (27.50 cc) it has a larger volume, i.e. lower compression: better over-rev and more top speed at the cost of bottom-end response. It also tolerates lower-octane fuel. Quick to change — the insert simply sits in the head and seals with O-rings. The last characters of the part number are engraved on the insert, so you cannot mix them up. The manufacturer's chart in the photos shows the choice by fuel, track type and elevation. Use it as a starting point. Fits: KTM 300 EXC (2024–2026); KTM 300 XC-W (2024–2026); Husqvarna TE 300 (2024–2026); GasGas EC 300 (2024–2026).