Yamaha Banshee 421 Cub Athena Alternative BPRATV ARES 68mm Big Bore Top End Kit For Sale

The Best Parts • The Best Performance • The Best PriceYamaha Banshee 421 Cub Athena Alternative BPRATV ARES 68mm Big Bore Top End Kit

S410485301023, 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

Yamaha Banshee ARES 68mm Cylinders by BPRATV – Athena Nikasil Performance at a Fraction of the Cost! ✅ Unleash Athena-Level Power at a Fraction of the Cost

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

🔥 Built to Perform – Complete Top End Kit

• Banshee ARES 68mm Nikasil Cylinders – pre-ported for dune/play powerband
• Larger water jackets for superior cooling
• Triple exhaust ports for a wide, responsive powerband
• 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. 😂
• Wiseco Pro Lite Forged STROKER Pistons with rings, pins, and circlips
• Heavy-duty wrist pin bearings
• Special cut 68mm big bore 4mil stroker domes (22cc)
• Cometic one-piece fiber base gasket, intake gaskets, and cool head O-ring kit*

🚨 Port Timing Matters – Even on Pre-Ported Cylinders

This 421cc kit is drop-in and bolt-on ready, and the cylinders are already factory dune/play ported. However, porting and port timing are not the same thing—and this is where many builds leave power on the table.

Porting refers to the shape and flow characteristics of the ports (which is already done). Port timing refers to when those ports open and close in relation to the crankshaft. When stepping up to a 421cc +4mm stroke, the piston travels farther, which changes the effective timing—even on a pre-ported cylinder.

• Cylinders are dune/play ported, but timing is optimized for 392cc–400cc setups
• Correcting port timing restores ideal piston-to-port relationship for a +4mm stroke
• Thick base gaskets only raise the cylinder and hurt compression and power
• Proper timing unlocks stronger mid-range, cleaner revs, and higher peak power
• Use BPRATV’s in-house port timing service to get everything this kit can deliver

✅ 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. Every cylinder is factory ported with a dune/play design for real performance gains.

Q: Is this kit drop-in ready?

A: Yes, but proper port timing correction is required for stroker builds to achieve full performance.

Q: What fuel is recommended?

A: With proper tuning, premium pump gas can be used.

🌟 Why Buy from BPRATV? Trusted Banshee Experts 🌟

At BPRATV, our promise is unwavering: The Best Parts. The Best Performance. The Best Price. We deliver only the highest quality Yamaha Banshee performance parts, proven to run stronger and last longer. Trust BPRATV to keep your Banshee running at its absolute 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.
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© 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.

Photos Are For Example Only Images show product quality, components, and visual reference. Exact parts, brands, finishes, quantities, or packaging may vary by kit. Please read the full product description for exact details before purchasing.Complete Your Build

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$68.98 BPRATV Performance Standard

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Professional installation by a qualified technician is recommended for best results.

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Notice Regarding Photos: Product photos used in our listings are for example only to show item quality, components, and visual reference. You will receive the correct quantity, size, and fitment for the specific kit listed. Exact brands, finishes, packaging, or small components may vary when equivalent-quality parts are used. Please read the full product description for exact details before purchasing.

Bearing Notice: In some cases, you may receive sealed bearings. If your application requires an open bearing, the seals can be removed when appropriate for the application.

Emissions & Race Use Only: Some products may be exempt from emission standards and requirements under 40 C.F.R. § 1051.620 and/or applicable California law. Certain parts are sold only for use with EPA-certified, purpose-built, nonroad vehicles used solely for closed-course, nonroad competition/racing. Installation may void the vehicle manufacturer\'s warranty and/or may be illegal in some locations. Buyer is responsible for confirming legal use in their application and location.

Warranty & Liability: Due to the nature of high-performance and racing applications, components may be sold without express or implied warranty of merchantability or fitness for a specific purpose except where specifically stated. BPRATV LLC shall not be liable for special, incidental, or consequential damages including loss of property, equipment, profits, or revenue resulting from sale, installation, or use of these parts. High-performance parts are not DIY items; work should be performed by a qualified, experienced mechanic.

Returns: Returns are accepted within 30 days for eligible items that are 100% complete, brand new, unused, uninstalled, and in original packaging. Items that have been installed, prepped, lubricated, sealed, modified, or used are not eligible. For warranty consideration, parts must be sent back for physical inspection. We do not warranty based on photos, emails, or third-party assessments.

Specialty Warranties: Certain specialty items, such as Cub cylinders or titanium fasteners, may have separate warranty terms. Any warranty does not cover improper tuning, installation, maintenance, or misuse.

Interchangeable Parts: Some kits may include interchangeable components or equivalent-quality substitutions to prevent backorder delays. Prices, included items, and listings are subject to change without notice.

Customer Satisfaction: If you experience any issue with your order, please contact us through Messages before leaving response. Our team is committed to resolving any concerns quickly and professionally.

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