{"product_id":"su-carburettor-piston-cushion-for-hs-series-aud2435","title":"SU Carburettor piston cushion for HS series- AUD2435","description":"\u003cdiv class=\"\" data-turn-id-container=\"request-WEB:112bc9d0-1865-45bf-90be-a61bf9dcb35e-0\" data-is-intersecting=\"true\"\u003e\n\u003csection class=\"text-token-text-primary w-full focus:outline-none has-data-writing-block:pointer-events-none [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-WEB:112bc9d0-1865-45bf-90be-a61bf9dcb35e-0\" data-turn-id-container=\"request-WEB:112bc9d0-1865-45bf-90be-a61bf9dcb35e-0\" data-testid=\"conversation-turn-2\" data-turn=\"assistant\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\"\u003e\n\u003cdiv data-conversation-screenshot-content=\"\" class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"c32f6e7e-e291-4c19-a39c-95f3dd4abd6d\" dir=\"auto\" data-message-model-slug=\"gpt-5-5\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\" data-turn-start-message=\"true\" tabindex=\"0\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert wrap-break-word w-full light markdown-new-styling\"\u003e\n\u003cp data-start=\"0\" data-end=\"132\"\u003eThe \u003cstrong data-start=\"4\" data-end=\"50\"\u003eSU HS Carburettor Piston Cushion (AUD2435)\u003c\/strong\u003e is a small but important adjustment component in an \u003cstrong data-start=\"103\" data-end=\"131\"\u003eSU HS-series carburettor\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cul data-start=\"170\" data-end=\"629\"\u003e\n\u003cli data-section-id=\"1058og3\" data-start=\"170\" data-end=\"408\"\u003e\n\u003cstrong data-start=\"172\" data-end=\"208\"\u003ePrevents metal-to-metal contact:\u003c\/strong\u003e The cushion acts as a stop between the piston and the carburettor bridge, preventing the aluminium piston from striking the bridge directly when the piston is fully down. This reduces wear and noise.\u003c\/li\u003e\n\u003cli data-section-id=\"11a6rw4\" data-start=\"410\" data-end=\"629\"\u003e\n\u003cstrong data-start=\"412\" data-end=\"448\"\u003eSets the initial piston opening:\u003c\/strong\u003e The cushion determines how far the piston sits above the bridge when at rest. This small gap affects the carburettor's baseline airflow and fuel metering at idle and just off idle.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-section-id=\"13pfh1l\" data-start=\"631\" data-end=\"645\"\u003e\u003cstrong\u003eAdjustment\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"647\" data-end=\"766\"\u003eThe cushion should protrude \u003cstrong data-start=\"675\" data-end=\"740\"\u003e0.008–0.012 inches (8–12 thou, or approximately 0.20–0.30 mm)\u003c\/strong\u003e above the piston surface.\u003c\/p\u003e\n\u003cp data-start=\"768\" data-end=\"781\"\u003eTo adjust it:\u003c\/p\u003e\n\u003col data-start=\"783\" data-end=\"1155\"\u003e\n\u003cli data-section-id=\"1i11ek6\" data-start=\"783\" data-end=\"825\"\u003eRemove the piston from the carburettor.\u003c\/li\u003e\n\u003cli data-section-id=\"16nip2a\" data-start=\"826\" data-end=\"941\"\u003eMeasure how far the cushion projects above the piston using a feeler gauge, dial indicator, or depth micrometer.\u003c\/li\u003e\n\u003cli data-section-id=\"1q3d1np\" data-start=\"942\" data-end=\"1030\"\u003eAdjust the cushion until it is \u003cstrong data-start=\"976\" data-end=\"1009\"\u003e0.008–0.012 in (0.20–0.30 mm)\u003c\/strong\u003e proud of the piston.\u003c\/li\u003e\n\u003cli data-section-id=\"ppli6r\" data-start=\"1031\" data-end=\"1155\"\u003eReassemble and ensure the piston moves freely and falls cleanly with the characteristic \"click\" when lifted and released.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp data-section-id=\"1dz3o8e\" data-start=\"1157\" data-end=\"1177\"\u003e\u003cstrong\u003eWhy this matters\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1179\" data-end=\"1197\"\u003eIf the cushion is:\u003c\/p\u003e\n\u003cul data-start=\"1198\" data-end=\"1408\"\u003e\n\u003cli data-section-id=\"mcevlt\" data-start=\"1198\" data-end=\"1287\"\u003e\n\u003cstrong data-start=\"1200\" data-end=\"1212\"\u003eToo low:\u003c\/strong\u003e The piston may hit the bridge, causing wear and incorrect piston position.\u003c\/li\u003e\n\u003cli data-section-id=\"eahd88\" data-start=\"1288\" data-end=\"1408\"\u003e\n\u003cstrong data-start=\"1290\" data-end=\"1303\"\u003eToo high:\u003c\/strong\u003e The piston will be held open too far, which can affect idle speed, mixture, and the transition off idle.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1410\" data-end=\"1670\" data-is-last-node=\"\" data-is-only-node=\"\"\u003eThis adjustment is part of a proper carburettor rebuild and is often overlooked. On twin HS carburettors, it's good practice to set both cushions to the same projection (within the specified tolerance) so both carburettors begin opening from the same position.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e","brand":"Minisport.com.au","offers":[{"title":"Default Title","offer_id":54199042179382,"sku":"AUD2435","price":5.0,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0727\/3322\/9366\/files\/Imagecomingsoon_ed398c99-575c-4c6a-912f-dff091c818b9.jpg?v=1783561073","url":"https:\/\/minisport.com.au\/products\/su-carburettor-piston-cushion-for-hs-series-aud2435","provider":"Minisport","version":"1.0","type":"link"}