Yamaha Banshee Athena 421cc Big Bore Stroker Kit CP Pistons Crank Head Domes Cub

S410485301023, S410485301024, P400485100024, 573M06800, 4111, CBK0044, PD300, M16800, 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

Banshee Athena 421cc CP-Carrillo Big Bore Stroker Kit Unleash Dominant Power: The Ultimate +4mm Stroker Athena Kit on the Market!

This is the Top Of The Line +4mm Stroker Athena Kit On The Marketa complete top-to-bottom motor rebuild that will compete with a Cheetah Cub at a fraction of the cost! Unleash the full potential of your Yamaha Banshee 350 with this 421cc Stroker Conversion Rebuild Kit, meticulously assembled to deliver unparalleled performance and reliability. With proper tuning on pump gas, you can easily hit 95+ hp with this kit! This is not just a rebuild; it’s a complete transformation designed for serious riders who demand aggressive power and blistering speed.

Uncompromising Quality: Athena Cylinders, Forged Pistons & Heavy-Duty Crank!

This comprehensive rebuild kit features only the highest-quality components. It includes a pair of Athena 68mm Banshee Cylinders with larger port windows for more power, larger water jackets for better cooling, and triple exhaust ports. The kit’s power comes from a pair of NEW CP Carrillo 68mm Big Bore Forged Stroker Pistons, complete with rings, pins, and clips. The bottom end is fortified with a Hot Rods Complete +4mm Stroker Crankshaft, which comes pre-welded, trued, and ready to install. For a secure seal, a Cometic One Piece Custom Base Gasket, a Complete Banshee Gasket Kit, and a Complete Banshee Engine Seal Kit are included. The package is topped off with a Pro Design Cool Head with Head Stud Kit and O-Ring Kit, 22cc Big Bore Domes (special custom cut, no spacer required), and a BPRATV Talon Titanium Acorn Cap Nuts to secure it all.

• Athena 68mm Banshee Cylinders (Pair) with Triple Exhaust Ports.
• NEW CP Carrillo 68mm Big Bore Forged Stroker Pistons (Pair).
• Hot Rods Complete +4mm Stroker Crankshaft with 115mm Heavy Duty Rods.
• Pro Design Cool Head with 22cc Big Bore Domes & Head Stud Kit.
• Complete Banshee Gasket Kit & Complete Banshee Engine Seal Kit.

Perfect Fit & Seamless Installation: Fits All Yamaha Banshee 350 Models!

This 421cc Stroker Conversion Rebuild Kit is engineered for a precise, hassle-free engine overhaul on all Yamaha Banshee YFZ 350 models and years from 1987 through 2006. As a complete top-to-bottom kit, it is a direct bolt-on solution with no case or head mods required.

** Port Timing Is Critical** this 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! We recommend using our in-house BPRATV porting service for max performance. Invest in this kit and get a true race-ready setup!

• Fits ALL Yamaha Banshee YFZ 350 Models (1987-2006).
• Hot Rods +4mm Stroker Crankshaft is true and welded, ready to install.
• No case or head mods required.
• Includes extra components like **Titanium Acorn Cap Nuts** and new **NGK Spark Plugs**.
• Piston runs on pump or race gas.

Frequently Asked Questions (FAQ)

• Q: What makes this a “Complete Top To Bottom Motor Rebuild” kit?

  A: This is an all-inclusive kit that covers every critical component for a full engine overhaul. It includes Athena cylinders, CP-Carrillo forged pistons, a Hot Rods +4mm stroker crankshaft, Pro Design cool head and domes, a full gasket and seal kit, and all necessary bearings and studs addressing both the top and bottom ends.

• Q: What displacement is achieved with this kit, and what is its horsepower potential?

  A: By combining the Athena 68mm cylinders with a +4mm stroker crank, this kit creates a displacement of 421cc. With proper tuning, this setup can easily achieve 95+ horsepower, offering a significant and noticeable power increase over a stock Banshee engine.

• Q: Why is proper port timing critical for this kit, and are case mods required?

  A: Yes, proper port timing is critical. This kit is designed for a 4mm stroke. The Athena cylinders were originally timed for a smaller displacement. Using a thick base gasket to correct this will rob your engine of power. It is crucial to have the cylinders professionally ported to match the 4mm stroke for maximum performance. Fortunately, no case modifications are required for installation.

• Q: What is included in the CP-Carrillo piston kit and the Pro Design Cool Head kit?

  A: The CP-Carrillo Piston Kit includes a pair of 68mm forged pistons, rings, pins, and clips. The Pro Design Cool Head kit comes with the cool head itself, a head stud kit, O-rings, and two custom 22cc 12-degree billet domes for optimal compression.

Why Buy from BPRATV? Your Go-To for Yamaha Banshee Performance Parts!

At BPRATV, our promise is unwavering: The Best Parts. The Best Performance. The Best Price. This Banshee Athena 421cc Big Bore Stroker Kit exemplifies our dedication to providing high-quality, essential components that guarantee your machine’s longevity and peak performance. We share your passion for two-stroke power and are committed to ensuring your Banshee screams flawlessly. Trust BPRATV to deliver the parts you need to keep your Banshee performing its best, every single time.

Upgrade your Banshee today & feel the power of a 421cc stroker!

BPRATV – The Best Parts. The Best Performance. The Best Price.

BRAPPPPPPPPPP!

BPRATV LLC

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