{"product_id":"osmg3001","title":"O.S. SPEED R21GT2 Combo Set (OSMG3001)","description":"\u003cdiv class=\"product_description\"\u003e\n\t\u003cp\u003eOS SPEED R21GT2 Combo Set is a high-performance RC engine package designed for GT-class on-road cars. It preserves the smooth feel and good fuel efficiency of the popular R21GT while sharpening mid- and low-range power, thanks to a redesigned crankshaft counterbalance and a revised inner head that improves idling stability. An O-ring helps dampen vibration and resist dust, and the lighter outer head with machined cooling fins supports better heat management. The combo comes with a tuned silencer and a compatible exhaust manifold for a complete install.\u003c\/p\u003e\n\t\u003cp\u003eKey details include a crankshaft with tungsten counterweights for balanced performance, a revised inner head that enhances low- and mid-range response, and a lighter outer head for further weight reduction. The engine breathes through five scavenging ports and three exhaust ports to meet racing regulations, and it uses a double-adjust GT carburetor with a 7.0 mm venturi for precise air‑fuel delivery. This combo is designed for GT chassis and delivers reliable idling, smooth throttle response, and steady on-track power.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"O.S. Engines (OSM)","offers":[{"title":"Default Title","offer_id":47574465609780,"sku":"OSMG3001","price":959.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0597\/6653\/8292\/files\/OSMG3001.jpg?v=1773321912","url":"https:\/\/nankinhobby.com\/products\/osmg3001","provider":"Nankin Hobby","version":"1.0","type":"link"}