The Best Parts • The Best Performance • The Best Price

BPR 102mm 686cc Big Bore Piston Cylinder Kit Yamaha Grizzly Raptor Rhino YFM 660

C7798,4811M10200,4966M10200,5KM-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<

Unlock the full power of your Yamaha 660 with this top-of-the-line Big Bore Top End Kit.

Squeeze every last ounce of power from your Yamaha 660 with this premium top end kit. The large 102mm +2mm bore size and top tier piston kit deliver a serious boost in horsepower and torque, This kit is engineered to handle the demands of high-performance riding, ensuring your Yamaha 660 can tackle the toughest terrain with confidence.

Fits Yamaha Raptor 660 / Rhino 660 / Grizzly 660 - All Years and Models

Drop In Ready. No case modification required.

Kit Includes:

BPRATV 102mm +2mm Big Bore Cylinder (1 year warranty)
Wiseco, CP, JE, or Wossner 102mm forged piston kit (includes piston rings, wristpin, and circlips)
Top End Gasket Kit with 102mm Big Bore MLS Head Gasket
Viton Valve Stems Seals (All 5)
BPRATV Heavy Duty OEM Replacement Cam Chain
BPRATV Titanium Cylinder Bolts / Head Stud Kit

1 year warranty for your peace of mind*

BPRATV - The Best Parts. The Best Performance. The Best Price.

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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.

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Professional Installation Required

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

If you have questions about this item or your order, our customer support team is always happy to help.

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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.

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