Banshee 421cc Stroker Kit ARES 68mm Athena-Style Cylinder Wiseco Hot Rods Crank!

Banshee 421cc ARES 68mm Athena-Style Stroker Big Bore Complete Engine Kit

Athena-Level Performance. Proven BPRATV Value.

The BPRATV Banshee ARES 68mm Cylinder Kit is engineered for riders who want serious horsepower, long-term reliability, and unbeatable value. Featuring a factory pre-ported dune/play port design, larger water jackets, and triple exhaust ports, this kit is ready for +4mm stroker builds with no spacer required.

🔥 Built to Perform – Complete 421cc Stroker Rebuild Kit

This complete top-to-bottom rebuild kit replaces higher-priced Athena cylinders with BPRATV ARES Nikasil cylinders that deliver true performance porting—not marketing gimmicks. Designed to compete directly with Cub-style builds, this kit can achieve 95+ HP on pump gas with proper tuning.

• BPRATV ARES 68mm Nikasil cylinders – factory dune/play ported (ACTUALLY PORTED, no gimmicks)
• Triple exhaust ports with larger port windows for a wide, responsive powerband
• Larger water jackets for superior cooling under high-load conditions
• Wiseco Pro Lite forged STROKER pistons with rings, pins, and circlips
• Hot Rods Heavy-duty wrist pin bearings
• Special-cut 68mm big bore +4mm stroker 22cc domes
• Pro Design Cool Head with head stud kit and O-ring kit
• Cometic one-piece custom fiber base gasket and intake gaskets
• Hot Rods complete +4mm stroker crankshaft with 115mm heavy-duty rods (true & welded, ready to install)
• Complete Yamaha Banshee engine gasket kit
• Complete Yamaha Banshee engine seal kit

📦 Extra Components Included at No Additional Cost

This kit includes critical extras that many sellers charge separately, ensuring your build goes together correctly the first time.

• BPRATV Talon Titanium Acorn Cap Nuts (Pro Design heads do not include nuts)
• Set of four new cylinder dowel pins – essential for any fresh build
• New pair of NGK spark plugs for reliable first start-up
• 1-year manufacturer warranty for peace of mind*

🚨 Port Timing Is Critical – Don’t Leave Power on the Table

This 421cc kit is drop-in and bolt-on ready; however, to extract every bit of performance, proper port timing is highly recommended. These cylinders are dune/play ported by design, but the port timing is optimized for 392cc–400cc configurations.

• Correct port timing is recommended to match the 421cc +4mm stroke
• Thick base gaskets are NOT a real solution and will reduce performance
• Use BPRATV’s in-house porting service for maximum horsepower and throttle response
• Proper timing delivers stronger mid-range pull and higher peak RPM power
• Ensures your Banshee reaches its full potential

✅ Compatibility & Nikasil Advantages

Designed for Yamaha Banshee YFZ350 models from 1987–2006. The Nikasil-plated aluminum cylinders provide superior durability, cooling, and piston life compared to traditional sleeves.

• Transfers heat more efficiently to keep engine temperatures lower
• Harder, smoother piston surface reduces friction and wear
• Longer service life between rebuilds
• Lightweight aluminum design improves throttle response
• Proven across 392cc, 400cc, and 421cc Banshee builds

Athena vs CPI Cub vs BPRATV ARES

Athena and CPI Cub cylinders have long been respected benchmarks in high-performance Yamaha Banshee builds. Athena is known for proven durability and consistency at a premium price point, while CPI Cub cylinders are recognized for race-focused power and Nikasil longevity. The BPRATV ARES cylinder bridges the gap—delivering Athena-level performance, strong power potential, and proven reliability with exceptional overall value for serious riders.

❓ Frequently Asked Questions (FAQ)

• Q: Are these cylinders actually ported or just triple exhaust?

  A:TRULY PORTED – No Gimmicks, No Games. When we say ported, we mean it. Every cylinder is factory ported with a dune/play design that delivers hard-hitting mid-range pull and screaming top-end power for all-around performance.

  • Don’t be fooled by “Triple Ported” 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. 😂
    
    
• Q: Can this kit compete with Athena or CPI Cub setups?

  A: Yes. The BPRATV ARES cylinders bridge the gap, delivering Athena-level performance and Cub-style power at a fraction of the cost.

• Q: Is race fuel required?

  A: No. With proper tuning, this kit can achieve 95+ HP on pump gas.

• Q: Is everything needed for a full rebuild included?

  A: Yes. This is a complete top-to-bottom rebuild kit that includes all the core components required for a proper 421cc setup. These are the main parts that are absolutely needed to complete the conversion; however, we always recommend additional items depending on the condition of your motor—such as a new transmission bearing kit, new cylinder water plugs, and many other optional upgrades and mods that are available.

🌟 Why Buy from BPRATV? Trusted Banshee Performance Experts 🌟

At BPRATV, our promise is unwavering: The Best Parts. The Best Performance. The Best Price. 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, every single time.

🔥 Upgrade your Yamaha Banshee with the ARES 68mm Cylinder Kit – power, precision, and reliability in one package! 🔥

BPRATV - The Best Parts. The Best Performance. The Best Price.

BRAPPPPPPPPPP!

© BPRATV LLC 1-year limited warranty from the manufacturer for material or workmanship defects.*

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.