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Wiseco Pistons 4966M10100 High Performance Forged Piston Kit 101mm Bore 9.9:1 CR

(Yamaha YFM660R Raptor 2001-05, YXR66F Rhino 660 2004-07, YXR66F Rhino 660 Special Edition 2006-07, YFM660F Grizzly 4x4 2002-08 + 3 more models)

Manufacturer

Picture for manufacturer Wiseco Pistons

Part Number

4966M10100
13 reviews
Sale Price

$224.99

2 left at this price

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Usually delivered within 2 days

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Product Details

The Wiseco 4966M10100 forged piston kit delivers premium performance for Yamaha Grizzly, Raptor, and Rhino 660 applications. This oversized piston measures 101mm (1.00mm overbore) with a 9.9:1 compression ratio, designed to restore power and reliability in high-performance ATV and UTV engines.

Key Features:

  • Forged in-house for superior strength and durability compared to cast pistons
  • 101mm bore diameter (1.00mm/0.040" oversize) with 9.9:1 compression ratio
  • Condensed grain structure aligned to part features for maximum impact and fatigue resistance
  • Optimized strength-to-weight ratio for enhanced performance
  • Includes piston, rings, wrist pin, and circlips for complete installation
  • Precision-manufactured skirt coating for reduced friction and extended wear

Application:

  • Yamaha YFM660 Grizzly (2002-2008)
  • Yamaha YFM660R Raptor (2001-2006)
  • Yamaha YXR660 Rhino (2004-2007)

Wiseco's complete control over the forging process—from raw aluminum bar to finished, coated components—ensures consistent quality and performance. The forged construction provides the toughness demanded by extreme racing conditions and high-performance applications where cast pistons would fail.

Products specifications

Fits

Yamaha YFM660R Raptor 2001-05, YXR66F Rhino 660 2004-07, YXR66F Rhino 660 Special Edition 2006-07, YFM660F Grizzly 4x4 2002-08, YXR66F Rhino 660 Ducks Unlimited 2007, YXR66F Rhino 660 Exploring Edition 2006-07, YXR66F Rhino 660 Sport Edition 2007

Used this site before. Great product.

Fast and easy found what I needed and checked out.

So far So good. Like Low Price guarantee and paying through amazon

thanks

Ez

Some items are not auto specific but when you enter the auto info it does not let you purchase the item

thanks

No immediate info as to if this is in stock and will arrive in 2 days as I paid the addtl34.

Good price over the product manufacturers web site, but item went up $18 since I found on this site last week. After receiving the Nfab nerf bars, I was disappointed in the overall fit and finish of a $300+ product.... Installation took very long because the product doesn't fit the vehicle well. By no means is this a bolt on application. I am very knowledgeable with vehicles and work in the auto industry, as well as an accomplished fabricator. Directions are vague and incomplete and generic at best. After a few modifications and some tweaking of mounting tabs, I was able to get the bars mounted and functioning as designed.

quick and easy ordering process

A happy customer comes back again

Website is easy to naviagte.

- Updated review -<br>Autoplicity.com contacted me after my original review and admitted to making a mistake with my order. They have refunded my shipping and I am happy now.<br><br>- Original review -<br>After 18 days the part finally arrived. The filter appears to have been sent directly from K&N, but I ordered on the 20th of June, yet the packing date that K&N Engineering Inc. shows is July 3rd.

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