4966M10000, 261524, 4737M10000 8577DA, 4811M10200,4966M10200,5KM-11310-00-00,80-82600,80-82600,YF-11181-00-00,810852,191070043070,3YF-11351-00-00,3YF-11181-00-00,2C6-11603-00-00,93450-24028-00,3YF-11631-00-X0,3YF-11633-01-00,90201-102G9-00,90105-10649-00,90105-09648-00,C7798-EST,DPR-8EA90-00-00,3YF-11310-01-00,261528,261527,272149,M1016B,8507D200,Unleash power in your Yamaha 660 with our 100mm Wiseco Piston & Cometic Top End Gasket Kit. Features 9.9:1 compression, MLS gasket, and a 1-year warranty. Fits all Raptor, Rhino, & Grizzly models.
Unlock the full power of your Yamaha 660 with this top-of-the-line Piston & Gasket Top End Kit! Engineered to handle the demands of high-performance riding, this premium kit ensures your Yamaha 660 can tackle the toughest terrain with confidence. Whether you ride a Raptor, Rhino, or Grizzly, this comprehensive kit breathes new life into your engine, giving you the reliability and power you need to conquer any challenge. Upgrade today and feel the exhilarating difference!
This kit includes the best parts in the industry to ensure a long-lasting, high-performing rebuild. At its core is a robust Wiseco 100mm Forged Piston Kit, designed for a 9.9:1 compression ratio that provides a perfect balance of performance and reliability. The kit is complete with OEM spec piston rings, wristpin, and circlips for a seamless assembly. To guarantee a leak-free seal, you'll receive a premium Cometic Top End Gasket Kit featuring a durable MLS (Multi-Layer Steel) Head Gasket. All these components are proudly made in USA, ensuring superior quality and a perfect fit for your Yamaha 660.
This kit is engineered for broad compatibility, fitting Yamaha Raptor 660, Rhino 660, and Grizzly 660 models from All Years. As a stock bore replacement, this kit requires no machining for installation, making your rebuild process straightforward and efficient. You get the best parts in the industry at an unbeatable price, allowing you to invest in a high-quality overhaul without breaking the bank. Don't settle for less; this comprehensive kit has everything you need to get back to riding confidently with enhanced power and durability.
A: The Wiseco piston is forged from high-quality aluminum for superior strength and durability.
A: An MLS (Multi-Layer Steel) Head Gasket provides a stronger, more reliable seal than traditional gaskets, making it ideal for high-performance engines.
A: Yes, this kit includes a Wiseco piston and a full Cometic top end gasket kit, providing all the necessary components for a complete top end rebuild.
A: No, this kit is a stock bore replacement and is designed for a direct, bolt-on installation without any machining required.
At BPRATV, our promise is unwavering: The Best Parts. The Best Performance. The Best Price. This complete Yamaha 660 top end kit is curated to deliver reliability, power, and value in one box—so you can spend less time wrenching and more time riding. Trust BPRATV to deliver the parts you need to keep your Yamaha 660 running at its best, every single time.
Upgrade your Yamaha 660 today and feel the power! 🏁
BPRATV - The Best Parts. The Best Performance. The Best Price.
BRAPPPPPPPPPP!
© BPRATV LLC
4966M1000, 261524, 4737M10000 8577DA, 4811M10200,4966M10200,5KM-11310-00-00,80-82600,80-82600,YF-11181-00-00,810852,191070043070,3YF-11351-00-00,3YF-11181-00-00,2C6-11603-00-00,93450-24028-00,3YF-11631-00-X0,3YF-11633-01-00,90201-102G9-00,90105-10649-00,90105-09648-00,C7798-EST,DPR-8EA90-00-00,3YF-11310-01-00,261528,261527,272149,M1016B,8507D200,Unleash power in your Yamaha 660 with our 100mm Wiseco Piston & Cometic Top End Gasket Kit. Features 9.9:1 compression, MLS gasket, and a 1-year warranty. Fits all Raptor, Rhino, & Grizzly models.
























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NOTICE REGARDING PHOTOS: Product photos used in our listings are for example only to show the high quality of our components. You will receive the correct quantity, size, and fitment of bearings, titanium fasteners, nuts, and bolts for the specific kit listed.
BEARING NOTICE: In some cases, you may receive SEALED bearings. If your application requires an OPEN bearing, the seals can easily be removed.
EMISSIONS & RACE USE ONLY: This product is exempt from emission standards and requirements of 40 C.F.R. § 1051 as provided by 40 C.F.R. § 1051.620, and California law [e.g., vehicle code §§ 27156 and 38391]. Sold ONLY for use with EPA-certified, purpose-built, nonroad vehicles used solely for closed course, nonroad competition/racing. Installation may void vehicle manufacturers' warranty and/or may be illegal in some locations.
WARRANTY & LIABILITY: © BPRATV LLC 1-year limited warranty from manufacturer for material/workmanship defects.* Due to the nature of high performance and racing, components are sold without express/implied warranty of merchantability or fitness for a specific purpose. BPRATV LLC shall not be liable for specific, incidental, or consequential damages (loss of property, equipment, profits, or revenue) resulting from sale, installation, or use of these parts. This product is NOT DIY; we strongly recommend work be done by a qualified, experienced mechanic.
RETURNS: Returns accepted within 30 days for items 100% complete, brand new, and in original packaging. Items installed or prepped (lubricated/sealed) are ineligible. For warranty consideration, parts MUST be sent back for physical inspection. No exceptions. We do not warranty based on photos, emails, or third-party assessments.
SPECIALTY WARRANTIES: Cub Cylinders: Lifetime warranty for original owner via BPRATV/Millennium Technologies inspection; covers cylinder only. Titanium Fasteners: Failure during use results in replacement only. Neither warranty covers improper tuning, installation, maintenance, or misuse.
INTERCHANGEABLE PARTS: We may substitute parts of equal quality from different manufacturers to prevent backorder delays. Prices and listings subject to change without notice.
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