Which insert for what▾
AE32361 inserts for the VHM head AA33222
VHM standard: OEM piston
for the VHM 12° piston
for the VHM 12° piston VHM standard: VHM 12° piston APKT08521707
for the VHM 12° piston
In general: smaller volume = higher compression = more pull but better fuel needed; larger volume = lower compression, the engine revs out more freely and tolerates pump fuel. If in doubt, take the standard.
Based on the VHM manufacturer charts.
VHM head insert KTM 85 SX / Husqvarna TC 85 25-27 / GasGas MC 85 25-27 – 025 6.80 cc
SKU: AE32361-025
Insert (combustion chamber)
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Which insert for what▾
AE32361 inserts for the VHM head AA33222
VHM standard: OEM piston
for the VHM 12° piston
for the VHM 12° piston VHM standard: VHM 12° piston APKT08521707
for the VHM 12° piston
In general: smaller volume = higher compression = more pull but better fuel needed; larger volume = lower compression, the engine revs out more freely and tolerates pump fuel. If in doubt, take the standard.
Based on the VHM manufacturer charts.
Description
Exchangeable combustion chamber (insert) for the VHM cylinder head AA33222. Chamber volume 6.80 cc. 🔴 The insert fits ONLY the VHM head AA33222 — it cannot be fitted into the OEM head. This insert is shaped for the VHM piston with a 12° dome (APKT08521707). Do not use it with the OEM piston — the lettered inserts are for that. Compared with the VHM standard (7.00 cc) it has a smaller volume, i.e. higher compression: the engine pulls harder but needs higher-octane fuel, otherwise it may detonate. 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 85 SX (2025–2027); Husqvarna TC 85 (2025–2027); GasGas MC 85 (2025–2027).
Compatibility (3)
Specifications
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