{"product_id":"vertex-beta-300-2022-on-73mm-top-end-rebuild-kit","title":"Vertex Beta 300 2022-on 73mm Top End Rebuild kit","description":"\u003cp\u003eImages shows the gaskets you will receive.  You will receive the correct parts for your model. It includes:\u003c\/p\u003e\n\u003cul type=\"disc\"\u003e\n\u003cli\u003eVertex piston kit in the size of your choice (A or B). Piston kit includes rings, pin, circlips and a high quality cast piston.\u003c\/li\u003e\n\u003cli\u003eTop end gasket kit.  Includes base gasket, powervalve cover gaskets, copper washers and O rings… all O rings are the correct size and made from the correct material, unlike the cheaper aftermarket kits.\u003c\/li\u003e\n\u003cli\u003elittle end bearing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003ePiston sizing: ideally you should measure your bore with a dial gauge to work out the correct piston sizing. If you cannot do this then a rough rule of thumb is use an A size under 100 hours of engine run time and use a B size over 100 hours of engine run time. Its ALWAYS better to have a bit too much clearance than not enough, so if in doubt use an A size.   RR 300 2T 2022-on Xtrainer 300 2T 2022 on    \u003c\/p\u003e","brand":"Rutherford Racing","offers":[{"title":"A","offer_id":67163494416459,"sku":null,"price":147.0,"currency_code":"GBP","in_stock":true},{"title":"B","offer_id":67163494449227,"sku":null,"price":147.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/5171\/7707\/files\/Screenshot2026-09-29175828_3478df54-8fc1-41c6-93ad-3fa52d0f8462.png?v=1790701509","url":"https:\/\/rutherfordracing.co.uk\/products\/vertex-beta-300-2022-on-73mm-top-end-rebuild-kit","provider":"Rutherford Racing","version":"1.0","type":"link"}