{"product_id":"banshee-athena-392-to-421-cylinders-conversion-top-end-kit-wiseco-pistons-domes","title":"Banshee Athena 392 to 421 Cylinders Conversion Top End Kit Wiseco Pistons +Domes","description":"\u003cp style=\"text-align: center;\"\u003e\u003cspan style=\"font-size: 1px; color: transparent;\"\u003eS410485301023, S410485301024, P400485850351\/1, 13077M06800, 9768M06800, BR8ES, PD300A, 2GU-11321-00-00, 2GU-11311-00-00, 2GU-11181-00-00, 2GU-11111-00-0, 3GG-11351-02-00, 2GU-11631-00-94, 2GU-11610-01-00, 93450-17129-00, 93310-316D6-00, 4L0-11633-00-00, BR8-ES000-00-00, B8E-S0000-00-00, 91830-21014-00 99530-10014-00 99510-10114-00, PD909\u003c\/span\u003e\u003c\/p\u003e \u003cdiv align=\"center\"\u003e \u003ch2 style=\"color:red;\"\u003e421cc Athena Big Bore Banshee Top End Kit\u003c\/h2\u003e \u003ch3 style=\"color:green;\"\u003eNo Spacer Needed – 4mil Stroker Ready\u003c\/h3\u003e \u003cp\u003e\u003cstrong\u003eUnlock serious power from your Yamaha Banshee\u003c\/strong\u003e with this all-in-one top end conversion kit designed for use with a +4mm stroker crankshaft – no spacer required! Transform your 68mm Athena 392cc setup into a roaring 421cc beast that delivers instant results and long-term reliability.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv align=\"center\"\u003e \u003ch3 style=\"color:green;\"\u003e🔥 Built to Perform – No Shortcuts\u003c\/h3\u003e \u003cp\u003eThis kit is engineered to eliminate guesswork. You’ll receive:\u003c\/p\u003e \u003cp\u003e- Athena 68mm Nikasil-Plated Cylinders (Set)\u003c\/p\u003e \u003cp\u003e- 68mm Wiseco Pro Lite Forged Piston Set w\/ Rings, Pins, Circlips\u003c\/p\u003e \u003cp\u003e- Heavy Duty Wrist Pin Bearings\u003c\/p\u003e\n\u003cp\u003e- Special Cut 68mm Big Bore 4mil Stroker 22cc Domes\u003c\/p\u003e \u003cp\u003e- BPRATV Talon Titanium Cylinder Head Stud Kit\u003c\/p\u003e \u003cp\u003e- Cometic Fiber Base Gasket\u003c\/p\u003e \u003cp\u003e- Intake Gaskets \u0026amp; Cool Head O-Ring Kit*\u003c\/p\u003e \u003cp\u003e- 4x New Cylinder Dowel Pins\u003c\/p\u003e \u003cp\u003e- 2x NGK Spark Plugs – Just Fire It Up!\u003c\/p\u003e \u003cp\u003e\u003cem\u003e*Fits all Pro Design-style heads. Mod Quad heads require a different kit—contact us after purchase if needed.\u003c\/em\u003e\u003c\/p\u003e \u003c\/div\u003e \u003cdiv align=\"center\"\u003e \u003ch3 style=\"color:red;\"\u003e🚨 Port Timing Is Critical – Don’t Skip It\u003c\/h3\u003e \u003cp\u003e\u003cstrong\u003eThis 421cc setup must be ported properly. The Athena port timing is made for a 392cc configuration from the factory. Slapping in a thick base gasket is NOT a real fix and WILL rob your Banshee of its true potential and a waste of your money!\u003c\/strong\u003e\u003c\/p\u003e \u003cp style=\"color:red;\"\u003e\u003cstrong\u003eWe strongly recommend:\u003c\/strong\u003e\u003c\/p\u003e \u003cp\u003e- Correcting port timing to match 421cc stroke\u003c\/p\u003e \u003cp\u003e- Watching Herr Jugs Racing's \"Banshee Porting 101\" for clarity\u003c\/p\u003e \u003cp\u003e- Using our in-house BPRATV porting service for max performance\u003c\/p\u003e\n\u003c\/div\u003e \u003cdiv align=\"center\"\u003e \u003ch3 style=\"color:green;\"\u003e❓ FAQ\u003c\/h3\u003e \u003cp\u003e- \u003cstrong\u003eWill this kit work with my OEM crank?\u003c\/strong\u003e\u003cbr\u003e No. A +4mm stroker crank is required. Hot Rods #4111 is recommended.\u003c\/p\u003e \u003cp\u003e- \u003cstrong\u003eDo I need to port the cylinders?\u003c\/strong\u003e\u003cbr\u003e Yes. This is absolutely necessary to get full performance from your 421cc setup.\u003c\/p\u003e \u003cp\u003e- \u003cstrong\u003eIs porting included?\u003c\/strong\u003e\u003cbr\u003e No, but we offer it in-house—contact us after purchase for pricing.\u003c\/p\u003e \u003cp\u003e- \u003cstrong\u003eDoes this fit all Banshee years?\u003c\/strong\u003e\u003cbr\u003e Yes. This kit fits all Yamaha Banshee years and models when used with a 4mil crank.\u003c\/p\u003e \u003cp\u003e- \u003cstrong\u003eAre the parts new?\u003c\/strong\u003e\u003cbr\u003e 100% brand new, sealed in original packaging.\u003c\/p\u003e\n\u003c\/div\u003e\u003cdiv align=\"center\"\u003e \u003cp\u003e\u003cspan style=\"\"\u003e\u003cstrong\u003e\u003cspan style=\"color: rgb(56, 118, 29);\"\u003eDon’t let a weak top end hold you back. Upgrade your Banshee the RIGHT way!\u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e \u003c\/div\u003e \u003cdiv align=\"center\"\u003e\u003cstrong\u003e\u003cspan style=\"color: rgb(0, 0, 255);\"\u003eBPRATV - The Best Parts. The Best Performance. The Best Price.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e \u003cstrong\u003e\u003c\/strong\u003e\u003cdiv align=\"center\"\u003e\u003cstrong\u003e\u003cspan style=\"color: rgb(0, 0, 255);\"\u003eBRAPPPPPPPPPP!\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e \u003c!-- 🔚 FOOTER --\u003e \u003cp style=\"text-align:center;font-size:12px;color:#555;\"\u003e © BPRATV LLC\u003c\/p\u003e","brand":"Athena","offers":[{"title":"Default Title","offer_id":44842216063173,"sku":"BANATH\/573M06800\/10-301\/NTP8\/M855i\/JT\/267296856835","price":1048.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0593\/1083\/3861\/files\/banshee-athena-392-421-cylinders-conversion-wiseco-pistons-complete-top-end-kit-2222_f3fc9140-0854-419d-95f9-c5b3e9f021e5.png?v=1750744860","url":"https:\/\/bpratv.com\/products\/banshee-athena-392-to-421-cylinders-conversion-top-end-kit-wiseco-pistons-domes","provider":"BPRATV","version":"1.0","type":"link"}