{"product_id":"banshee-421cc-ares-stroker-kit-athena-cub-alternative-cp","title":"Yamaha Banshee 421cc ARES Stroker Kit Athena-Style Cylinder CP-Carrillo Pro Head","description":"\u003cp style=\"text-align: center;\"\u003e\u003cspan style=\"font-size: 0.000000px; color: transparent;\"\u003eGet Athena-style performance without the premium price. BPRATV Yamaha Banshee 421cc ARES 68mm stroker kit with Nikasil cylinders, Wiseco pistons, and Hot Rods crank. S410485301023, S410485301024, P400485100024, 573M06800, 4111, CBK0044, PD300, 808812, 822154, BR8ES, K018, 10-301, B1005, 21.2020, 8101D200, 2GU-11311-00-00, 2GU-11321-00-00,2GU-11181-00-00, 2GU-11631-00-94, 2GU-11610-01-00, 4L0-11633-00-00, 93450-17129-00, 93310-316D6-00,3GG-11351-02-00, B0627020F, B0627018AFM, B0627015F, 99530-10114-00, IR019018AFM, MNB160210225A, 8055681300989, 29L-11400-30-00 29L-11412-00-00 29L-11401-09-00, 29L-11442-10-00, 93306-30571-00, 93310-523D2-00, 90209-22257-00, 29L-11651-00-00, 93306-30549-00 93103-25108-00\u003c\/span\u003e\u003c\/p\u003e \u003cdiv style=\" max-width:800px; margin:0 auto; font-family:Arial,Helvetica,sans-serif; font-size:16px; line-height:1.5; color:#222; \"\u003e \u003ch2 style=\"text-align:center;font-size:26px;margin:0 0 12px 0;\"\u003e \u003cstrong\u003eBanshee 421cc ARES 68mm Athena-Style Stroker Big Bore Complete Engine Kit\u003c\/strong\u003e \u003c\/h2\u003e \u003ch3 style=\"color:#c00;text-align:center;margin:20px 0 8px 0;\"\u003e Athena-Level Performance. Proven BPRATV Value. \u003c\/h3\u003e \u003cp style=\"text-align:center;margin:0 0 16px 0;\"\u003e The \u003cstrong\u003eBPRATV Banshee ARES 68mm Cylinder Kit\u003c\/strong\u003e is engineered for riders who want serious horsepower, long-term reliability, and unbeatable value. Featuring a \u003cstrong\u003efactory pre-ported dune\/play port design\u003c\/strong\u003e, larger water jackets, and triple exhaust ports, this kit is \u003cstrong\u003eready for +4mm stroker builds with no spacer required\u003c\/strong\u003e. \u003c\/p\u003e \u003ch3 style=\"color:#c00;text-align:center;margin:22px 0 8px 0;\"\u003e 🔥 Built to Perform – Complete 421cc Stroker Rebuild Kit \u003c\/h3\u003e \u003cp style=\"text-align:center;margin:0 0 16px 0;\"\u003e This complete top-to-bottom rebuild kit replaces higher-priced Athena cylinders with \u003cstrong\u003eBPRATV ARES Nikasil cylinders\u003c\/strong\u003e that deliver true performance porting—not marketing gimmicks. Designed to compete directly with Cub-style builds, this kit can achieve \u003cstrong\u003e95+ HP on pump gas\u003c\/strong\u003e with proper tuning. \u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eBPRATV ARES 68mm Nikasil cylinders\u003c\/strong\u003e – factory dune\/play ported (ACTUALLY PORTED, no gimmicks)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTriple exhaust ports\u003c\/strong\u003e with larger port windows for a wide, responsive powerband\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eLarger water jackets\u003c\/strong\u003e for superior cooling under high-load conditions\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCP Carrillo forged STROKER pistons\u003c\/strong\u003e with rings, pins, and circlips\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHot Rods\u003c\/strong\u003e Heavy-duty wrist pin bearings\u003c\/li\u003e \u003cli\u003eSpecial-cut 68mm big bore + \u003cstrong\u003e4mm stroker 22cc domes\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePro Design Cool Head\u003c\/strong\u003e with head stud kit and O-ring kit\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCometic\u003c\/strong\u003e one-piece custom fiber base gasket and intake gaskets\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHot Rods complete +4mm stroker crankshaft\u003c\/strong\u003e with 115mm heavy-duty rods (true \u0026amp; welded, ready to install)\u003c\/li\u003e \u003cli\u003eComplete Yamaha Banshee \u003cstrong\u003eengine gasket kit\u003c\/strong\u003e\n\u003c\/li\u003e \u003cli\u003eComplete Yamaha Banshee \u003cstrong\u003eengine seal kit\u003c\/strong\u003e\n\u003c\/li\u003e \u003c\/ul\u003e \u003ch3 style=\"color:#c00;text-align:center;margin:22px 0 8px 0;\"\u003e 📦 Extra Components Included at No Additional Cost \u003c\/h3\u003e \u003cp style=\"text-align:center;margin:0 0 14px 0;\"\u003e This kit includes critical extras that many sellers charge separately, ensuring your build goes together correctly the first time. \u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eBPRATV Talon Titanium Acorn Cap Nuts\u003c\/strong\u003e (Pro Design heads do not include nuts)\u003c\/li\u003e \u003cli\u003eSet of four \u003cstrong\u003enew cylinder dowel pins\u003c\/strong\u003e – essential for any fresh build\u003c\/li\u003e \u003cli\u003eNew pair of \u003cstrong\u003eNGK spark plugs\u003c\/strong\u003e for reliable first start-up\u003c\/li\u003e \u003cli\u003e1-year manufacturer warranty for peace of mind*\u003c\/li\u003e \u003c\/ul\u003e \u003ch3 style=\"color:#c00;text-align:center;margin:22px 0 8px 0;\"\u003e 🚨 Port Timing Matters – Even on Pre-Ported Cylinders \u003c\/h3\u003e \u003cp style=\"text-align:center;margin:0 0 14px 0;\"\u003e This \u003cstrong\u003e421cc\u003c\/strong\u003e kit is \u003cstrong\u003edrop-in and bolt-on ready\u003c\/strong\u003e, and the cylinders are already factory dune\/play ported. However, \u003cstrong\u003eporting\u003c\/strong\u003e and \u003cstrong\u003eport timing\u003c\/strong\u003e are not the same thing—and this is where many builds leave power on the table. \u003c\/p\u003e \u003cp style=\"text-align:center;margin:0 0 14px 0;\"\u003e \u003cstrong\u003ePorting\u003c\/strong\u003e refers to the shape and flow characteristics of the ports (which is already done). \u003cstrong\u003ePort timing\u003c\/strong\u003e refers to when those ports open and close in relation to the crankshaft. When stepping up to a \u003cstrong\u003e421cc +4mm stroke\u003c\/strong\u003e, the piston travels farther, which changes the effective timing—even on a pre-ported cylinder. \u003c\/p\u003e \u003cul\u003e \u003cli\u003eCylinders are dune\/play ported, but timing is optimized for 392cc–400cc setups\u003c\/li\u003e \u003cli\u003eCorrecting port timing restores ideal piston-to-port relationship for a +4mm stroke\u003c\/li\u003e \u003cli\u003eThick base gaskets only raise the cylinder and hurt compression and power\u003c\/li\u003e \u003cli\u003eProper timing unlocks stronger mid-range, cleaner revs, and higher peak power\u003c\/li\u003e \u003cli\u003eUse \u003cstrong\u003eBPRATV’s in-house port timing service\u003c\/strong\u003e to get everything this kit can deliver\u003c\/li\u003e \u003c\/ul\u003e \u003ch3 style=\"color:#c00;text-align:center;margin:22px 0 8px 0;\"\u003e ✅ Compatibility \u0026amp; Nikasil Advantages \u003c\/h3\u003e \u003cp style=\"text-align:center;margin:0 0 14px 0;\"\u003e Designed for Yamaha Banshee YFZ350 models from 1987–2006. The \u003cstrong\u003eNikasil-plated aluminum cylinders\u003c\/strong\u003e provide superior durability, cooling, and piston life compared to traditional sleeves. \u003c\/p\u003e \u003cul\u003e \u003cli\u003eTransfers heat more efficiently to keep engine temperatures lower\u003c\/li\u003e \u003cli\u003eHarder, smoother piston surface reduces friction and wear\u003c\/li\u003e \u003cli\u003eLonger service life between rebuilds\u003c\/li\u003e \u003cli\u003eLightweight aluminum design improves throttle response\u003c\/li\u003e \u003cli\u003eProven across 392cc, 400cc, and 421cc Banshee builds\u003c\/li\u003e \u003c\/ul\u003e \u003ch3 style=\"color:#c00;text-align:center;margin:22px 0 8px 0;\"\u003e Athena vs CPI Cub vs BPRATV ARES \u003c\/h3\u003e \u003cp style=\"text-align:center;margin:0 0 14px 0;\"\u003e Athena and CPI Cub cylinders have long been respected benchmarks in high-performance Yamaha Banshee builds. \u003cstrong\u003eAthena\u003c\/strong\u003e is known for proven durability and consistency at a premium price point, while \u003cstrong\u003eCPI Cub\u003c\/strong\u003e cylinders are recognized for race-focused power and Nikasil longevity. The \u003cstrong\u003eBPRATV ARES cylinder\u003c\/strong\u003e bridges the gap—delivering \u003cstrong\u003eAthena-level performance\u003c\/strong\u003e, strong power potential, and proven reliability with exceptional overall value for serious riders. \u003c\/p\u003e \u003ch3 style=\"color:#c00;text-align:center;margin:22px 0 12px 0;\"\u003e ❓ Frequently Asked Questions (FAQ) \u003c\/h3\u003e \u003cdiv style=\"max-width:720px;margin:0 auto;\"\u003e \u003cdiv style=\"margin-bottom:22px;\"\u003e \u003cp style=\"margin:0 0 6px 0;\"\u003e\u003cstrong\u003eQ: Are these cylinders actually ported or just triple exhaust?\u003c\/strong\u003e\u003c\/p\u003e \u003cp style=\"margin:0 0 0 20px;\"\u003e\u003cstrong\u003eA:\u003c\/strong\u003e TRULY PORTED – No Gimmicks, No Games. When we say ported, we mean it. \u003cstrong\u003eEvery cylinder is factory ported\u003c\/strong\u003e with a dune\/play design that delivers hard-hitting mid-range pull and screaming top-end power for all-around performance.\u003c\/p\u003e \u003cp style=\"margin:6px 0 0 20px;\"\u003eDon’t be fooled by \u003cstrong\u003e“Triple Ported”\u003c\/strong\u003e Cylinder claims — all that means is the cylinder has three exhaust ports (ours do too). What sets us apart is that our cylinders are actually performance-ported for real gains, not just marketing jargon. 😂\u003c\/p\u003e \u003c\/div\u003e \u003cdiv style=\"margin-bottom:22px;\"\u003e \u003cp style=\"margin:0 0 6px 0;\"\u003e\u003cstrong\u003eQ: Can this kit compete with Athena or CPI Cub setups?\u003c\/strong\u003e\u003c\/p\u003e \u003cp style=\"margin:0 0 0 20px;\"\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes. The BPRATV ARES cylinders bridge the gap, delivering Athena-level performance and Cub-style power at a fraction of the cost.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv style=\"margin-bottom:22px;\"\u003e \u003cp style=\"margin:0 0 6px 0;\"\u003e\u003cstrong\u003eQ: Is race fuel required?\u003c\/strong\u003e\u003c\/p\u003e \u003cp style=\"margin:0 0 0 20px;\"\u003e\u003cstrong\u003eA:\u003c\/strong\u003e No. With proper tuning, this kit can achieve 95+ HP on pump gas.\u003c\/p\u003e \u003c\/div\u003e \u003cdiv\u003e \u003cp style=\"margin:0 0 6px 0;\"\u003e\u003cstrong\u003eQ: Is everything needed for a full rebuild included?\u003c\/strong\u003e\u003c\/p\u003e \u003cp style=\"margin:0 0 0 20px;\"\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes. This is a complete top-to-bottom rebuild kit that includes all the core components required for a proper \u003cstrong\u003e421cc\u003c\/strong\u003e setup. These are the main parts that are absolutely needed for a complete rebuild; however, we always recommend additional items depending on the condition of your motor—such as a new transmission bearing kit, new cylinder water plugs, billet water pump impeller upgrade, titanium clutch pusher, and many other optional upgrades and mods that are available.\u003c\/p\u003e \u003c\/div\u003e \u003c\/div\u003e \u003ch3 style=\"color:#c00;text-align:center;margin:22px 0 8px 0;\"\u003e 🌟 Why Buy from BPRATV? Trusted Banshee Performance Experts 🌟 \u003c\/h3\u003e \u003cp style=\"text-align:center;margin:0 20px 14px 20px;\"\u003e At BPRATV, our promise is unwavering: \u003cstrong\u003eThe Best Parts. The Best Performance. The Best Price.\u003c\/strong\u003e Every ARES kit is tested across real-world Banshee builds to deliver reliable, repeatable power. Trust BPRATV to keep your Yamaha Banshee running at its best, \u003cstrong\u003eevery single time.\u003c\/strong\u003e \u003c\/p\u003e \u003cp style=\"text-align:center;color:#38761d;margin:0 0 18px 0;\"\u003e \u003cstrong\u003e\u003cem\u003e🔥 Upgrade your Yamaha Banshee with the ARES 68mm Cylinder Kit – power, precision, and reliability in one package! 🔥\u003c\/em\u003e\u003c\/strong\u003e \u003c\/p\u003e \u003cdiv align=\"center\"\u003e \u003cstrong\u003e\u003cspan style=\"color:#0000ff;\"\u003eBPRATV - The Best Parts. The Best Performance. The Best Price.\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e \u003cstrong\u003e\u003cspan style=\"color:#0000ff;\"\u003eBRAPPPPPPPPPP!\u003c\/span\u003e\u003c\/strong\u003e \u003c\/div\u003e \u003cp style=\"text-align:center;font-size:10px;color:#555;margin:20px 0 0 0;\"\u003e © BPRATV LLC 1-year limited warranty from the manufacturer for material or workmanship defects.*\u003cbr\u003e\u003cbr\u003e Due to the nature of high performance and racing applications, BPRATV LLC components are sold without express or implied warranty. This product is exempt from emission standards under 40 C.F.R. § 1051.620 and is sold for closed-course competition use only. \u003c\/p\u003e \u003c\/div\u003e","brand":"BPRATV","offers":[{"title":"Default Title","offer_id":45580291637445,"sku":"287049625273\/J\/BAN68LRC\/M16800\/4111\/PD300A","price":1648.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0593\/1083\/3861\/files\/banshee-ares-68mm-athena-style-cylinder-421cc-stroker-crank-cp-pistons-pro-head-cub-23_6fcc6d02-d55d-4a9e-858e-17a50932d112.png?v=1767407985","url":"https:\/\/bpratv.com\/products\/banshee-421cc-ares-stroker-kit-athena-cub-alternative-cp","provider":"BPRATV","version":"1.0","type":"link"}