Which insert for what▾
Which insert to choose — by fuel and track
110 RON — elevation 750–2000 m
98 RON — elevation 750–2000 m 102 RON — elevation 750–2000 m 110 RON — hard pack 110 RON + 6% oxygen — elevation 750–2000 m
95 RON — elevation 750–2000 m 110 RON — deep sand 110 RON + 6% oxygen — hard pack
98 RON — hard pack / deep sand 102 RON — hard pack / deep sand 110 RON + 6% oxygen — deep sand
95 RON — hard pack
95 RON — deep sand
Find your fuel and track — hard pack (also intermediate and dark soil) or deep sand (extreme, e.g. beach racing). Values apply at sea level; “elevation 750–2000 m” = the insert for riding at that elevation. An insert with no recommendation is an in-between step for fine tuning.
The manufacturer's chart is a general guideline, not a fixed rule — engine condition, exhaust and jetting matter too.
Based on the VHM manufacturer charts.
VHM cylinder head KTM 125 SX 23-27 / Husqvarna TC 125 23-27 / GasGas MC 125 24-27 + insert F 11.60 cc
SKU: AA33208-AE32335-F
Replaces part numbers: AA33208, AE32335-F
Insert (combustion chamber)
Need another insert for the head, e.g. for a different fuel? Inserts sold separately →
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Which insert for what▾
Which insert to choose — by fuel and track
110 RON — elevation 750–2000 m
98 RON — elevation 750–2000 m 102 RON — elevation 750–2000 m 110 RON — hard pack 110 RON + 6% oxygen — elevation 750–2000 m
95 RON — elevation 750–2000 m 110 RON — deep sand 110 RON + 6% oxygen — hard pack
98 RON — hard pack / deep sand 102 RON — hard pack / deep sand 110 RON + 6% oxygen — deep sand
95 RON — hard pack
95 RON — deep sand
Find your fuel and track — hard pack (also intermediate and dark soil) or deep sand (extreme, e.g. beach racing). Values apply at sea level; “elevation 750–2000 m” = the insert for riding at that elevation. An insert with no recommendation is an in-between step for fine tuning.
The manufacturer's chart is a general guideline, not a fixed rule — engine condition, exhaust and jetting matter too.
Based on the VHM manufacturer charts.
HEAD AND INSERT INCLUDED: VHM head AA33208 + insert AE32335-F (combustion chamber 11.60 cc, 98 RON fuel). Once fitted the head is ready to ride, nothing else to buy. Golden VHM two-stroke cylinder head with an exchangeable combustion chamber. It is designed to keep the engine's power throughout the whole race, not just the first laps: the improved water duct takes heat away from the combustion chamber more effectively. Made from a high-quality alloy and sealed with O-rings instead of a conventional gasket. WHAT THE INSERT IS AND WHY YOU NEED IT The VHM head has two parts: the golden cooled body and the chamber fitted into it — the insert. The insert sets the combustion chamber volume, i.e. the compression. Smaller volume = higher compression = more pull, but it needs higher-octane fuel. Larger volume = lower compression = the engine revs out more freely and tolerates pump fuel. When you change fuel, track or elevation you swap only the insert, not the whole head. WHICH INSERT TO CHOOSE (OEM piston) • AE32335-B — 10.80 cc, 110 RON fuel • AE32335-C — 11.00 cc, 105 RON fuel • AE32335-D — 11.20 cc, 105 RON fuel • AE32335-E — 11.40 cc, 98 RON fuel • AE32335-F — 11.60 cc, 98 RON fuel (VHM standard) • AE32335-G — 11.80 cc, 98 RON fuel • AE32335-H — 12.00 cc, 95 RON fuel If in doubt, take the VHM standard: AE32335-F (11.60 cc) for 98 RON fuel. For the VHM piston with a 12° dome (APKT12511725A) use the numbered inserts (AE32335-030, AE32335-031, AE32335-032, AE32335-033, AE32335-034, AE32335-035, AE32335-036) — listed separately under VHM inserts. The 12° piston is not combined with a lettered insert. The manufacturer's chart in the photos shows the choice by fuel, track type (hard pack / deep sand) and elevation. Treat it as a starting point, not a fixed rule. BENEFITS • more engine power • better heat transfer • exchangeable combustion chambers The vent screw M6×8 with its copper washer is included and already fitted. Spare O-rings: seal kit SK33156. Fits: KTM 125 SX (2023–2027); Husqvarna TC 125 (2023–2027); GasGas MC 125 (2024–2027); KTM 125 XC (2023–2027).
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