Which insert for what▾
VHM 12° piston + OEM CDI
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 102 RON — hard pack 110 RON + 6% oxygen — deep sand
95 RON — hard pack 98 RON — deep sand 102 RON — deep sand
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.
With the OEM piston and OEM CDI, VHM gives insert AE32327-G (11.60 cc) as the standard.
VHM 12° piston + VHM CDI (CD020422 / CD020426)
110 RON — elevation 750–2000 m
102 RON — elevation 750–2000 m 110 RON — hard pack 110 RON + 6% oxygen — elevation 750–2000 m
98 RON — elevation 750–2000 m 110 RON — deep sand 110 RON + 6% oxygen — hard pack
95 RON — elevation 750–2000 m 102 RON — hard pack 110 RON + 6% oxygen — deep sand
98 RON — hard pack 102 RON — deep sand
95 RON — hard pack 98 RON — deep sand
With the VHM CDI the ignition timing differs, so a larger-volume insert is used than with the OEM CDI.
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 head insert Yamaha YZ 125 22-27 / Fantic XX 125 22-27 – B 10.80 cc
SKU: AE32327-B
Insert (combustion chamber)
Price incl. VAT (23%)
Shipping from €3.90
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24-month warranty
on all parts
Which insert for what▾
VHM 12° piston + OEM CDI
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 102 RON — hard pack 110 RON + 6% oxygen — deep sand
95 RON — hard pack 98 RON — deep sand 102 RON — deep sand
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.
With the OEM piston and OEM CDI, VHM gives insert AE32327-G (11.60 cc) as the standard.
VHM 12° piston + VHM CDI (CD020422 / CD020426)
110 RON — elevation 750–2000 m
102 RON — elevation 750–2000 m 110 RON — hard pack 110 RON + 6% oxygen — elevation 750–2000 m
98 RON — elevation 750–2000 m 110 RON — deep sand 110 RON + 6% oxygen — hard pack
95 RON — elevation 750–2000 m 102 RON — hard pack 110 RON + 6% oxygen — deep sand
98 RON — hard pack 102 RON — deep sand
95 RON — hard pack 98 RON — deep sand
With the VHM CDI the ignition timing differs, so a larger-volume insert is used than with the OEM CDI.
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.
Exchangeable combustion chamber (insert) for the VHM cylinder head AA33203. Chamber volume 10.80 cc. 🔴 The insert fits ONLY the VHM head AA33203 — it cannot be fitted into the OEM head. For the stock (OEM) piston. Compared with the VHM standard (11.60 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: Yamaha YZ 125 (2022–2027); Fantic XX 125 (2022–2027).
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