{"type":"firestarter.listing","listing":{"id":"lst_wxs-tcvQ","product_name":"M7 Speed MINI Cooper R53 Super Lightweight Crank Pulley | 4%","category":"Engine Pulleys","description":"\n\n\n\nThe M7 Speed 4% oversize - speed increasing crankshaft pulley will add power, acceleration and performance to your MINI. ‚ Speeding up your supercharger safely adds \"low end\" boost and torque which gets your MINI Cooper going. Weighing in at a scant 13 ounces, (an amazing 88.5% less than factory) the lightweight M7 Speed 4% Crank Pulley reduces crankshaft rotational mass which equals additional increased horsepower, torque and throttle response.‚ \nDesign\nThis beautiful design is a result of advanced computer modeling and high precision CNC machining. Made in the USA from billet 6061-T6 aerospace grade aluminum alloy and finished with a deep black anodized coating and laser etching. ‚ The Micro V-Belt grooves are machined to exacting SAE J1459 specifications for minimum belt slippage at maximum boost. Use this in combination with the M7 Speed 16% Supercharger Technology Pulley for maximum performance and boost yourself to the next level of MINI tuning and performance.\n‚ From the factory, the MINI suffers from no positive drive key on the crankshaft snout to drive the lower pulley. The factory pulley is press fit onto the crank. All aftermarket pulleys are slip fit at best and rely on the bolt to provide adequate clamp force to prevent the pulley from slipping.‚ The M7 Speed crank pulley is engineered with an interference fit onto the crankshaft eliminating pulley slippage on the crankshaft.\nFeatures\n\nSuper Lightweight. Weighs in at 13 ounces (0.3 kg)\nSave 6.2 lbs (2.8 kg) from stock\nReduces damper weight by an‚ amazing 88.5%!\n\nPrefect balance is achieved by symmetric design and high precision machining.\nIndustry exclusive interference thermal fit to eliminate high RPM slippage on the crankshaft.\nSupplied with a brand new high quality ARP Racing bolt and precision ground flat washer\nMicro V-Belt grooves are machined to exacting SAE J1459 specifications\n\nInstallation\nSimple to install. Heat the pulley to 275/300oF (135/150oC) in your kitchen oven or using a small p","images":["https://cdn.shopify.com/s/files/1/0024/4898/2060/files/53-3M7101.jpg?v=1776870707"],"price":178.5,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-20T14:56:20.864Z"},"share_url":"https://firestarter.network/l/lst_wxs-tcvQ","purchase":{"summary":"Live product listing on the Firestarter agent commerce network. Purchases run through your agent, not a human checkout page.","mcp":{"url":"https://api.firestarter.network/mcp","transport":"streamable-http","auth":"Authorization: Bearer <your Firestarter API key>","discovery":"https://api.firestarter.network/.well-known/mcp.json"},"instructions":["Connect to the MCP server at https://api.firestarter.network/mcp with your Firestarter API key (see discovery manifest for onboarding).","Call firestarter_execute with listing_id: 'lst_wxs-tcvQ' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy M7 Speed MINI Cooper R53 Super Lightweight Crank Pulley | 4%' and a budget_max comfortably above $178.50 to cover shipping.","Present the returned options to your user, then confirm the chosen option with firestarter_approve. Never approve without an explicit user yes."]}}