VHM cylinder head Beta RR 300 2T 13-24 / RR 300 2T Racing 18-23 / RR 300 2T X-PRO 25-27 + insert C 27.50 cc

HEAD AND INSERT INCLUDED: VHM head AA33182 + insert AE32295-C (combustion chamber 27.50 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) • AE32295-C — 27.50 cc, Beta RR300 2T '18-21, CROSS RX300 '23-24 • AE32295-E — 28.50 cc, Beta RR300 2T '18-21, CROSS RX300 '23-24 (VHM standard) • AE32295-F — 29.50 cc, Beta RR300 2T '18-21, CROSS RX300 '23-24 • AE32305-C — 27.50 cc, Beta RR300 '13-17 • AE32305-E — 28.50 cc, Beta RR300 '13-17 (VHM standard) • AE32305-F — 29.50 cc, Beta RR300 '13-17 VHM STANDARD INSERT • AE32295-E (28.50 cc) • AE32305-E (28.50 cc) BENEFITS • more engine power • better heat transfer • more resistance to detonation • exchangeable combustion chambers Spare O-rings: seal kit SK33182. A BR8ECM spark plug is included in the box. For extreme enduro you can use a BR7ES spark plug, which is NOT included. Fits: Beta RR 300 2T (2013–2024); Beta RR 300 2T Racing (2018–2023); Beta Xtrainer 300 2T (2019–2027); Beta Enduro RX 300 2T (2021–2022); Beta Cross RX 300 2T (2023–2025); Beta RR 300 2T X-PRO (2025–2027).