Banshee 421cc Athena Big Bore +4mm Stroker Engine Rebuild Kit

🔧 Yamaha Banshee Athena 421cc 68mm Big Bore +4mm Stroker Complete Engine Rebuild Kit Ready to take your Banshee to the next level? 🛠️ This 421cc Athena Big Bore +4mm stroker engine rebuild kit delivers serious power gains with reliable components. Designed to fit all Yamaha Banshee models and years, this kit includes everything you need for a full bottom and top end rebuild—no guesswork, just bolt-on performance. ✅ What’s Included: Athena 68mm big bore cylinders Modquad billet Cool Head with upgraded head stud kit Billet 22cc pump gas domes (machined for +4mm stroker crank) Hotrods +4mm stroker crankshaft with rods Maxload and TZ outer crank bearings Wiseco forged pistons (68mm, big bore) High-temp piston rings Chrome wrist pins Circlips Wrist pin bearings NGK spark plugs Precision dowel pins Complete top and bottom end gasket kit One-piece big bore base gasket Complete engine seal kit Water pump bearing Upgraded clutch pusher with bearing mod 📦