{"product_id":"b6mc18140b-ht-leads-set-genuine-mazda","title":"Genuine Mazda Ignition HT Lead Set – MX-5 Mk2 1.6 • B6MC-18-140B","description":"\u003cdiv\u003e\n\u003cp style=\"margin:0 0 8px;font-size:calc(14px + 0.1vw);\"\u003e\u003cstrong\u003eGenuine Mazda B6MC-18-140B Ignition HT Lead Set\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp style=\"margin:0 0 8px;font-size:calc(14px + 0.1vw);\"\u003eReplacement Genuine Mazda high-tension ignition lead set for \u003cstrong\u003eMazda MX-5 Mk2 and Mk2.5 \/ NB models with the 1.6L petrol engine\u003c\/strong\u003e listed in the compatibility table.\u003c\/p\u003e\n\n\u003cp style=\"margin:0 0 8px;\"\u003eThe four insulated leads connect the twin ignition-coil assembly to the engine spark plugs, carrying the high-voltage electrical pulse required to ignite the air-and-fuel mixture inside each cylinder.\u003c\/p\u003e\n\n\u003cp style=\"margin:0 0 8px;\"\u003eCorrectly functioning ignition leads help maintain reliable starting, stable idle, clean acceleration and consistent combustion under engine load.\u003c\/p\u003e\n\n\u003cp style=\"margin:0 0 8px;\"\u003eAge, heat and repeated vibration can cause the insulation, internal conductor or terminal connections to deteriorate. High voltage may then leak to the engine or adjacent components instead of reaching the spark plug.\u003c\/p\u003e\n\n\u003cp style=\"margin:0 0 8px;\"\u003eThis listing supplies one complete Genuine Mazda four-piece ignition lead set, which is the quantity required per applicable engine.\u003c\/p\u003e\n\n\u003cul style=\"margin:0 0 8px;padding-left:18px;\"\u003e\n\u003cli\u003ePart type: High-tension ignition lead set\u003c\/li\u003e\n\u003cli\u003eMazda catalogue description: Cord set, high tension\u003c\/li\u003e\n\u003cli\u003eAlternative descriptions: HT leads \/ spark-plug leads \/ ignition cable set \/ plug-wire set\u003c\/li\u003e\n\u003cli\u003eMazda diagram position: 18140\u003c\/li\u003e\n\u003cli\u003ePrimary function: Transfers high-voltage ignition current from the coils to the spark plugs\u003c\/li\u003e\n\u003cli\u003eSystem: Engine ignition system\u003c\/li\u003e\n\u003cli\u003eFitting position: Between the ignition-coil assembly and spark plugs\u003c\/li\u003e\n\u003cli\u003ePrimary vehicle application: Mazda MX-5 Mk2 and Mk2.5 \/ NB 1.6L\u003c\/li\u003e\n\u003cli\u003eEngine application: 1.6L B6-family petrol engine\u003c\/li\u003e\n\u003cli\u003eTransmission application: Manual\u003c\/li\u003e\n\u003cli\u003eNumber of leads: Four\u003c\/li\u003e\n\u003cli\u003eQuantity required per engine: One complete set\u003c\/li\u003e\n\u003cli\u003eQuantity supplied: Four ignition leads\u003c\/li\u003e\n\u003cli\u003eBrand: Genuine Mazda\u003c\/li\u003e\n\u003cli\u003ePart No.: B6MC-18-140B\u003c\/li\u003e\n\u003cli\u003eAlso referenced as: B6MC18140B\u003c\/li\u003e\n\u003cli\u003eAssociated earlier revision: B6MC-18-140A\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp style=\"margin:0 0 8px;\"\u003e\u003cstrong\u003eTypical reasons for replacement:\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul style=\"margin:0 0 8px;padding-left:18px;\"\u003e\n\u003cli\u003eIntermittent or persistent engine misfire\u003c\/li\u003e\n\u003cli\u003eRough or unstable idle\u003c\/li\u003e\n\u003cli\u003eDifficult starting\u003c\/li\u003e\n\u003cli\u003eHesitation during acceleration\u003c\/li\u003e\n\u003cli\u003eMisfire under heavy engine load\u003c\/li\u003e\n\u003cli\u003eReduced performance or increased fuel consumption\u003c\/li\u003e\n\u003cli\u003eVisible cracking or hardening of the insulation\u003c\/li\u003e\n\u003cli\u003eBurn marks or evidence of electrical arcing\u003c\/li\u003e\n\u003cli\u003eLoose, corroded or damaged terminals\u003c\/li\u003e\n\u003cli\u003eUnknown ignition-lead age or service history\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp style=\"margin:0 0 8px;\"\u003e\u003cstrong\u003eFitment advice:\u003c\/strong\u003e This listing is conservatively allocated to the Mazda MX-5 Mk2 and Mk2.5 \/ NB 1.6L engine application associated with the B6MC Mazda reference. Similar-looking lead sets and related Mazda numbers are used on other NA and NB engines.\u003c\/p\u003e\n\n\u003cp style=\"margin:0 0 8px;\"\u003e\u003cstrong\u003eReference advice:\u003c\/strong\u003e Aftermarket catalogues commonly group B6MC-18-140B with B61P-18-140B, B61P-18-140C, BPE8-18-140 and BPE8-18-140A. These references should not automatically be treated as a confirmed one-directional Mazda supersession chain.\u003c\/p\u003e\n\n\u003cp style=\"margin:0 0 8px;\"\u003e\u003cstrong\u003eReplacement advice:\u003c\/strong\u003e Replace the leads as a complete set to maintain consistent conductor resistance, insulation condition and terminal fit across all four cylinders.\u003c\/p\u003e\n\n\u003cp style=\"margin:0 0 8px;\"\u003e\u003cstrong\u003eRouting advice:\u003c\/strong\u003e Record the original firing-order and lead routing before removal. Replace one lead at a time where possible to avoid connecting the ignition coils to the wrong cylinders.\u003c\/p\u003e\n\n\u003cp style=\"margin:0 0 8px;\"\u003e\u003cstrong\u003eRemoval advice:\u003c\/strong\u003e Pull each lead using the moulded terminal boot rather than the cable itself. Pulling directly on the cable can separate the internal conductor from the terminal.\u003c\/p\u003e\n\n\u003cp style=\"margin:0 0 8px;\"\u003e\u003cstrong\u003eInspection advice:\u003c\/strong\u003e Inspect the ignition coils, coil towers, spark-plug wells and lead-separating clips. Oil, water, corrosion or carbon tracking can cause repeated misfires even after new leads are installed.\u003c\/p\u003e\n\n\u003cp style=\"margin:0 0 8px;\"\u003e\u003cstrong\u003eSpark-plug advice:\u003c\/strong\u003e Inspect the spark plugs for wear, contamination, incorrect gap or cracked insulation. Excessive spark-plug resistance can place additional electrical stress on the ignition leads and coils.\u003c\/p\u003e\n\n\u003cp style=\"margin:0 0 8px;\"\u003e\u003cstrong\u003eOil-leak advice:\u003c\/strong\u003e Engine oil inside the spark-plug wells usually indicates deterioration of the rocker-cover or plug-well seals. Repair the leak before fitting the replacement leads.\u003c\/p\u003e\n\n\u003cp style=\"margin:0 0 8px;\"\u003e\u003cstrong\u003eDiagnostic advice:\u003c\/strong\u003e Ignition-lead failure is only one possible cause of a misfire. Check the spark plugs, ignition coils, electrical connections, compression and fuel delivery where symptoms remain after replacement.\u003c\/p\u003e\n\n\u003cp style=\"margin:0 0 8px;\"\u003e\u003cstrong\u003eOther items to consider:\u003c\/strong\u003e Consider inspecting or replacing the spark plugs, ignition coils, rocker-cover gasket, plug-well seals and ignition-lead retaining clips according to their condition.\u003c\/p\u003e\n\n\u003cp style=\"margin:0 0 8px;\"\u003e\u003cstrong\u003eUseful tools \/ consumables:\u003c\/strong\u003e Spark-plug socket, ratchet and extension, torque wrench, dielectric grease used sparingly where appropriate, inspection lamp and electrical-contact cleaner.\u003c\/p\u003e\n\n\u003cp style=\"margin:0 0 8px;\"\u003e\u003cstrong\u003eDifficulty guide:\u003c\/strong\u003e DIY Difficulty: Easy. The leads are accessible from the top of the engine, but the correct firing order and original routing must be maintained.\u003c\/p\u003e\n\n\u003cp style=\"margin:0 0 8px;\"\u003e\u003cstrong\u003eWhy Genuine Mazda?\u003c\/strong\u003e Genuine Mazda ignition leads are manufactured to the intended lengths, conductor resistance, terminal design, insulation specification and original engine routing. Using the correct OE set helps ensure secure connections at the ignition coils and spark plugs.\u003c\/p\u003e\n\n\u003cp style=\"margin:0 0 8px;\"\u003e\u003cstrong\u003eWhat’s in the box:\u003c\/strong\u003e One Genuine Mazda four-piece high-tension ignition lead set, part number B6MC-18-140B. Ignition coils, spark plugs, retaining clips and installation tools are not included unless specifically shown or stated separately.\u003c\/p\u003e\n\n\u003cp style=\"margin:0 0 8px;\"\u003e\u003cstrong\u003eInstallation notes:\u003c\/strong\u003e Switch off the ignition and allow the engine to cool. Record the original lead positions and routing, then replace one lead at a time. Push each terminal fully onto its ignition-coil tower and spark plug until securely seated. Route the cables through the original clips, keeping them away from hot, sharp or moving components, and confirm the firing order before starting the engine.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Genuine Mazda","offers":[{"title":"Default Title","offer_id":45733835473120,"sku":"B6MC-18-140B","price":67.49,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0633\/8274\/9408\/files\/B6MC-18-140B_1.jpg?v=1786634726","url":"https:\/\/www.mazspec.co.uk\/products\/b6mc18140b-ht-leads-set-genuine-mazda","provider":"MazSpec","version":"1.0","type":"link"}