VHM cylinder head KTM 250 SX / Husqvarna TC 250 17-22 / GasGas MC 250 22-23 + insert E 22.20 cc

HEAD AND INSERT INCLUDED: VHM head AA33166 + insert AE32272-E (combustion chamber 22.20 cc). 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) • AE32272-T — 24.00 cc, 250EXC '17, 250EXC TPI / TE250i '18-23 (VHM standard: 250EXC with OEM piston) • AE32272-C — 21.80 cc, 250SX '17-22, TC250 '17-22 • AE32272-E — 22.20 cc, 250SX '17-22, TC250 '17-22 (VHM standard: 250SX with OEM piston) • AE32272-F — 22.60 cc, 250SX '17-22, TC250 '17-22 VHM STANDARD INSERT • AE32272-T (24.00 cc) — 250EXC with OEM piston • AE32272-E (22.20 cc) — 250SX with OEM piston For the VHM piston with a 12° dome (APKT25021754A1) use the numbered inserts (AE32272-024) — listed separately under VHM inserts. The 12° piston is not combined with a lettered insert. BENEFITS • more engine power • better heat transfer • more resistance to detonation • exchangeable combustion chambers The vent screw M6×8 with its copper washer is included and already fitted. Spare O-rings: seal kit SK33098. Fits: Husqvarna TC 250 (2017–2022); Husqvarna TE 250 (2017–0); KTM 250 EXC (2017–0); KTM 250 SX (2017–2022); GasGas MC 250 (2022–2023).