Which insert for what▾
AE32281 inserts for the VHM head AA33171
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 18-24 / GasGas MC 85 21-24 – 014 8.20 cc
SKU: AE32281-014
Insert (combustion chamber)
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Which insert for what▾
AE32281 inserts for the VHM head AA33171
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 AA33171. Chamber volume 8.20 cc. 🔴 The insert fits ONLY the VHM head AA33171 — 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 (8.00 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. Fits: KTM 85 SX (2018–2024); Husqvarna TC 85 (2018–2024); GasGas MC 85 (2021–2024).
Compatibility (3)
Specifications
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