{"product_id":"harddrive-40-mm-cv-carb-slide-diaphram-diaphragm-820-27502","title":"Harddrive 40 MM CV Carb Slide Diaphram - Diaphragm","description":"\u003cp\u003eHarddrive 40 mm CV carb slide diaphragm for V-twin motorcycles. This is a replacement diaphragm that regulates vacuum-operated needle position in constant-velocity carburetors, maintaining proper fuel delivery across throttle ranges.\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eOEM-equivalent replacement for 40 mm CV carbs\u003c\/li\u003e\n  \u003cli\u003eDirect-fit diaphragm assembly\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Harddrive\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part #:\u003c\/strong\u003e 40039\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 191361512254\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 3 in x 3 in x 3 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.5 lbs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e China (Mainland)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFitment\u003c\/h2\u003e\n\u003cp\u003eFits V-twin motorcycles equipped with 40 mm constant-velocity (CV) carburetors.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat does a CV carb diaphragm do?\u003c\/h3\u003e\n\u003cp\u003eThe diaphragm responds to engine vacuum to adjust the needle position, keeping fuel mixture correct at all throttle positions and RPM ranges.\u003c\/p\u003e\n\u003ch3\u003eHow do I know if my diaphragm needs replacement?\u003c\/h3\u003e\n\u003cp\u003eSigns include rough idle, hesitation on acceleration, or fuel leaking from carb overflow tubes — common when the diaphragm ruptures or loses flexibility.\u003c\/p\u003e\n\u003ch3\u003eWill this fit my Harley or Indian?\u003c\/h3\u003e\n\u003cp\u003eIf your bike runs a 40 mm CV carburetor, yes. Confirm your carb size and model before ordering — some bikes use different carb types.\u003c\/p\u003e\n\u003ch3\u003eIs installation difficult?\u003c\/h3\u003e\n\u003cp\u003eModerate DIY job — requires removing the carb slide cover and carefully installing the new diaphragm without tearing it. Carb removal may be necessary depending on your bike's layout.\u003c\/p\u003e","brand":"Harddrive","offers":[{"title":"Default Title","offer_id":53036088393839,"sku":"820-27502","price":35.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/6734\/6543\/files\/output_bf1d131a-846f-49db-8815-c0a5715087b1.png?v=1779565433","url":"https:\/\/vtwinbikers.com\/products\/harddrive-40-mm-cv-carb-slide-diaphram-diaphragm-820-27502","provider":"Vtwinbikers","version":"1.0","type":"link"}