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The Camshaft Exhaust Stage 1 & 1 System is part of the latest collection from Hot Cams.. Features: For dual cam engine. Adds a 5%-10% power gain. Designed and dyno proven in the USA. Manufactured by utilizing state of the art valvetrain software. CNC machined from 8620 billet, case-hardened steel for an exact fit and lobe profile. This exhaust camshaft is to be used with specified stage 1 and stage 2 intake camshafts as noted.. Engineered to be drop-in cams, that use stock valve springs (unless otherwise noted).. Select cams feature Hot Cams Improved Throttle Design (ITR) technology; these cams improve throttle response throughout the entire rpm range while providing excellent power gains through the mid-range and top-end.. When used with 0925-1242 (stage 1) power increases from 4000 rpm to redline. When used with 0925-1244 (stage 2) provides mid range and top end increase over 8000 rpm, with no loss on the bottom end. Designed with I.T.R. technology. Uses stock auto-decompression mechanism. Exhaust Valve Lash: 0.195 mm.. Specifications: Application: Exhaust. Exhaust Duration: 256�. Exhaust Lift: 9.650 mm. Exhaust Lobe Centerline: 104�. Product Name: Camshaft. Type: Stage 1| Stage 2. Units: Each. To fit: KAWASAKI KX 250 F 2017 American Models. KAWASAKI KX 250 F 2017 European Models. KAWASAKI KX 250 F 2018 American Models. KAWASAKI KX 250 F 2018 European Models. KAWASAKI KX 250 F 2019 All Models. Manufacturer part number: 2312-E. View all Hot Cams. View all Parts and spares..