Yamaha Banshee Athena 68mm Big Bore 4mm Stroker Engine Kit

🔥 Athena 68mm Big Bore 4mm Long Rod Engine Kit – Yamaha Banshee

This is a high-performance big bore stroker kit designed to make real, reliable power. Featuring clean-up ported Athena cylinders, forged Wiseco pistons, and a +4mm Hotrods crank, this package is ideal for riders who want more torque, cooler temps, and long-lasting strength.

✅ Fits all Yamaha Banshee models and years
✅ Built for power, reliability, and bolt-on performance

📦 Kit Includes:

• Athena 68mm Big Bore Cylinders – Clean-up ported for smoother flow

• Hotrods +4mm Long Rod Crankshaft with Rods – Stroker-ready setup

• Wiseco Forged Big Bore Pistons

• High-Temp Piston Rings

• Chrome Wristpins, Circlips, Wrist Pin Bearings

• Pro Design Billet Cool Head – Includes 22cc domes machined for 4mm crank

• Maxload and TZ Outer Crank Bearings

• Transmission Bearings + Water Pump Bearing

• NGK Spark Plugs

• Cylinder to Case Dowel Pins

• Complete Gasket Kit + Full Seal Kit

• Billet Water Pump Impeller with Bearing

• Clutch Pusher with Bearing

• Hi-Temp Ceramic Clutch Ball – Won’t weld to pushrod

💪 Why This Kit?

• Designed for use with a +4mm crank

• Ported Athena cylinders flow better and hit harder

• Billet upgrades and ceramic clutch ball = less wear, more durability

• Domes matched to crank spec for proper squish

• All parts brand new in factory packaging

• No machining required – Bolt-on ready

📦 Shipping Time:
Ships within 5–7 business days. Tracking provided at fulfillment.

💬 Customer Support:
Reach us Monday–Friday, 7 AM to 4 PM PST, with live store chat 24/7.

🏁 Why Buy from Us?

Banshees are our specialty. We stock more Banshee parts — from Cub and Super Cub cylinders to budget builds — than anyone online. Whether you're building mild or wild, we’ve got you covered.