{"product_id":"rotax-max-combustion-chamber-insert","title":"5. 223386 Rotax Max Combustion Chamber Insert","description":"\u003cp\u003eThe \u003cstrong\u003eRotax Max Combustion Chamber Insert\u003c\/strong\u003e (R.223386) is the OEM precision-machined insert that defines the combustion chamber volume and shape in the Rotax 125 MAX EVO cylinder head. This insert is a sealed, scrutineered component at Rotax Challenge events — its dimensions directly determine compression ratio and combustion chamber geometry, so it must be present, unmodified, and correctly seated for technical compliance. The insert is retained in the cylinder head by the large head o-ring (R.250160) and is a replacement item when the head is damaged or when a fresh combustion chamber surface is needed.\u003c\/p\u003e\n\u003cp\u003eCompatible with all Rotax 125 MAX EVO variants: \u003cstrong\u003eRotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/strong\u003e. Sealed at the head face by the large o-ring (R.250160) and at the smaller port by o-ring R.430782.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e[VERIFY]\u003c\/strong\u003e Your price sheet marks this part \"Pre 2025\" — confirm with your Rotax distributor whether R.223386 is still the current production part number or if an updated combustion chamber insert has been issued for 2025-spec cylinders.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Part Number:\u003c\/strong\u003e R.223386\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Rotax 125 Senior MAX EVO, Junior MAX EVO, Mini MAX EVO, Micro MAX EVO\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCMC Karting stocks the Rotax combustion chamber insert alongside the cylinder head components and full top-end rebuild parts.\u003c\/p\u003e","brand":"KSG\/Karting Solutions Group","offers":[{"title":"Default Title","offer_id":48168038334685,"sku":"R.223386","price":127.05,"currency_code":"USD","in_stock":true}],"url":"https:\/\/cmckarting.com\/products\/rotax-max-combustion-chamber-insert","provider":"CMC Karting","version":"1.0","type":"link"}