SKU 266964564355
🛠️ Yamaha Banshee 421cc 68mm Big Bore SINGLE Wiseco Piston Kit
Perfect for Cheetah Cub, Serval & +4mm Stroker Rebuilds
What’s Included:
🔩 1 x Wiseco Pro Lite Forged Piston – 68mm (573M06800)
🔧 Piston Rings, Wrist Pin & Circlips
🇯🇵 1 x Shindy HD Wrist Pin Bearing – Made in Japan
Key Features & Benefits:
⚙️ Built for 421cc +4mm Crank Engines
Ideal for Cheetah Cub, Wampus, Serval, or other Banshee 68mm big bore stroker kits.
🛠️ Perfect Replacement for One Cylinder
Whether you're replacing a damaged piston or building a single-cylinder setup (e.g., Blaster), this kit delivers.
🏁 Wiseco Forged Quality – Made in USA
Lightweight and ultra-durable Pro Lite piston for serious performance and reliability.
📦 Complete Top-End Piston Kit
Comes with everything needed for a precise and hassle-free rebuild.
Compatibility:
✔️ Fits Yamaha Banshee-based engines using:
– 421cc Cheetah / Cub / Serval / Wampus cylinders
– 68mm bore
– +4mm stroked crankshaft
✔️ Also compatible with Yamaha Blaster custom builds using single-cylinder big bore kits.
❌ Not compatible with stock displacement Banshee or non-stroker setups.
Why Choose This Piston?
If you're running a 421cc twin and only need to replace one side, this is your fix. Made in the USA by Wiseco and paired with a premium Japanese bearing, this kit is built to last and perform under pressure. Trusted by serious builders worldwide.
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My 400ex has never sounded better. New tensioner, guides, and chain fixed the noise. Metal bottom end gasket was cool too, didn't rip while working on it.
Thank you for your positive review! We're glad to hear that the TRX400EX Cam Chain Tensioner & Wiseco Heavy Duty Cam Chain Kit was able to fix the ticking noise on your 400ex. We agree, these small maintenance steps can make a big difference in the overall performance and sound of your vehicle. We appreciate your feedback and hope to continue providing quality products for your ATV. Happy riding!
Well my mechanic said it was some good parts in the box. I'll let you know how the rebuild goes. Great I hope
I haven’t received them yet
Trevor, thank you for your 5 star review. We appreciate that. Rest assured I just checked your tracking info and UPS says they will arrive today between 1:30 & 3:00 pm. Your going to love the Lectron Carburetors!
Great quality and fast shipping thanks
I received the wrong center crankcase gasket
Hi there, thank you for bringing this to our attention. We apologize for the inconvenience of receiving the wrong gasket. We take pride in our products and want to ensure that our customers receive the correct items. We sell countless TRX400EX engine kits and we always ship the same gasket every time. In situations like this, we encourage our customers to reach out to us so we can rectify the issue. We would have been more than happy to ship out the correct gasket right away if you had sent us a picture of the wrong one. Please don't hesitate to contact us for any further assistance. Thank you for choosing our product.