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2005
Yamaha
YZ250

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Wiseco - 804M06640 - Piston Kit, Standard Bore 66.36mm

4.9416 product ratings
E and I Motorsports (90464)
99.1% positive feedback
Price:
$131.97
Free shipping
Estimated delivery Mon, Sep 29 - Thu, Oct 2
Returns:
30 days returns. Seller pays for return shipping.
Condition:
New
Fits: 1999-2024 Yamaha YZ250 (2-Stroke). Piston kit is precision crafted and forged in the USA.

About this product

Product Identifiers

BrandWiseco
Manufacturer Part Number804M06640
eBay Product ID (ePID)171233714

Additional Product Features

Part TypePiston Kit

All listings for this product

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New
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Wiseco 99-23 Yamaha YZ250 ProLite 2614CD Piston Kit for 2-Stroke Engines
item 1 Wiseco 99-23 Yamaha YZ250 ProLite 2614CD Piston Kit for 2-Stroke Engines
$118.77
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Wiseco - 804M06640 - Piston Kit, Standard Bore 66.36mm
item 2 Wiseco - 804M06640 - Piston Kit, Standard Bore 66.36mm
$122.50
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Wiseco 66.40mm Pro-Lite Piston Kit Standard 804M06640
item 3 Wiseco 66.40mm Pro-Lite Piston Kit Standard 804M06640
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Yamaha YZ250 Wiseco Pro-Lite Piston Stock 66.4mm Bore 804M06640
item 4 Yamaha YZ250 Wiseco Pro-Lite Piston Stock 66.4mm Bore 804M06640
$124.85
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Wiseco Pro-Lite Piston Kit 66.40 MM Yamaha YZ 250 99-22 YZ250X 16-22 804M06640
item 5 Wiseco Pro-Lite Piston Kit 66.40 MM Yamaha YZ 250 99-22 YZ250X 16-22 804M06640
$131.97
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Wiseco Piston M06640 Yz250 '02 2614Cd - 804M06640
item 6 Wiseco Piston M06640 Yz250 '02 2614Cd - 804M06640
$131.97
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Wiseco Piston - 66.40 mm Bore | 804M06640
item 7 Wiseco Piston - 66.40 mm Bore | 804M06640
$131.97
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YAMAHA YZ250 YZ250X 1999-2024 Wiseco Piston Kit Std Bore 66.40mm 804M06640
item 8 YAMAHA YZ250 YZ250X 1999-2024 Wiseco Piston Kit Std Bore 66.40mm 804M06640
$131.97
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Wiseco 804M06640 Piston Kit Pro-Lite Standard (66.4 mm)
item 9 Wiseco 804M06640 Piston Kit Pro-Lite Standard (66.4 mm)
$131.97
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Yamaha YZ250 Wiseco Piston Kit 66.40mm Std Stock Bore 1999-2024 804M06640 YZ 250
item 10 Yamaha YZ250 Wiseco Piston Kit 66.40mm Std Stock Bore 1999-2024 804M06640 YZ 250
$131.97
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Wiseco Piston Kit - Standard Bore 66.36mm Motorcycle ATV/UTV Street 804M06640
item 11 Wiseco Piston Kit - Standard Bore 66.36mm Motorcycle ATV/UTV Street 804M06640
$131.97
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Wiseco Pro-Lite Piston Assembly - 804M06640
item 12 Wiseco Pro-Lite Piston Assembly - 804M06640
$131.97
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Wiseco Piston Kit Yamaha YZ250 1999-2023 804M06640 66.40mm Standard Bore
Almost gone
item 13 Wiseco Piston Kit Yamaha YZ250 1999-2023 804M06640 66.40mm Standard Bore
$131.97
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Wiseco ProLite Piston Kit 66.4mm Bore For Yamaha YZ250 250X '99-2025 804M06640
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item 14 Wiseco ProLite Piston Kit 66.4mm Bore For Yamaha YZ250 250X '99-2025 804M06640
$131.97
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Wiseco Piston Pro-Lite 66.40mm for Yamaha YZ250 1999-2011
item 15 Wiseco Piston Pro-Lite 66.40mm for Yamaha YZ250 1999-2011
$131.97
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804M06640 Wiseco Piston Kit 1999-2024 Yamaha YZ250/X Piston Std 66.4mm Bore
item 16 804M06640 Wiseco Piston Kit 1999-2024 Yamaha YZ250/X Piston Std 66.4mm Bore
$131.97
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Wiseco 2-Stroke Piston - Pro-Lite / Stock Bore 804M06640
item 17 Wiseco 2-Stroke Piston - Pro-Lite / Stock Bore 804M06640
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Wiseco 804M06640 Piston Kit for Engine Pistons Piston Kits ik
item 18 Wiseco 804M06640 Piston Kit for Engine Pistons Piston Kits ik
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Wiseco 804M06640 Piston Kit Standard Bore 66.40mm
item 19 Wiseco 804M06640 Piston Kit Standard Bore 66.40mm
$131.97
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804M06640 Wiseco Powesports Fits For Yamaha Yz250 99 19 Prolite 2614Cd
item 20 804M06640 Wiseco Powesports Fits For Yamaha Yz250 99 19 Prolite 2614Cd
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Wiseco Piston Fits Yamaha - 249 cc
item 21 Wiseco Piston Fits Yamaha - 249 cc
$131.97
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Wiseco Piston Kit Standard Bore 66.40mm 804M06640
item 22 Wiseco Piston Kit Standard Bore 66.40mm 804M06640
$131.97
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Wiseco Pro Lite Piston Kit 66.40mm For YAMAHA YZ250 YZ250X 1999-2021
item 23 Wiseco Pro Lite Piston Kit 66.40mm For YAMAHA YZ250 YZ250X 1999-2021
$131.97
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Wiseco Pro-Lite 66.40mm Piston Kit for '99-23 Yamaha YZ250/YZ250X (804M06640)
item 24 Wiseco Pro-Lite 66.40mm Piston Kit for '99-23 Yamaha YZ250/YZ250X (804M06640)
$131.97
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Wiseco - 804M06640 - Piston Kit, Standard Bore 66.36mm
item 25 Wiseco - 804M06640 - Piston Kit, Standard Bore 66.36mm
$131.97
Free shipping
Wiseco - Powersports Piston M06640 YZ250 '02 2614CD 804M06640
item 26 Wiseco - Powersports Piston M06640 YZ250 '02 2614CD 804M06640
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Wiseco 804M06640 Piston for Yamaha YZ250 2002 2614CD
item 27 Wiseco 804M06640 Piston for Yamaha YZ250 2002 2614CD
$131.97
Free shipping
Wiseco Std Bore 66.40mm Piston Kit Yamaha YZ250 99-23, YZ250 X 16-23
Last one
item 28 Wiseco Std Bore 66.40mm Piston Kit Yamaha YZ250 99-23, YZ250 X 16-23
$131.97
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Wiseco 804M06640 66.40MM PISTON
item 29 Wiseco 804M06640 66.40MM PISTON
$132.35
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Wiseco Piston Wiseco 804M06640 66.40 mm 2-Stroke Off-Road Piston
item 30 Wiseco Piston Wiseco 804M06640 66.40 mm 2-Stroke Off-Road Piston
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804M06640 WISECO DIRTBIKE PISTON STANDARD
item 31 804M06640 WISECO DIRTBIKE PISTON STANDARD
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Wiseco Piston Kit - Standard Bore 66.40mm - 804M06640
item 32 Wiseco Piston Kit - Standard Bore 66.40mm - 804M06640
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Wiseco Pro-Lite 66.40mm Piston Kit for '99-23 Yamaha YZ250/YZ250X (804M06640)
item 33 Wiseco Pro-Lite 66.40mm Piston Kit for '99-23 Yamaha YZ250/YZ250X (804M06640)
$134.33
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Wiseco Piston Kit 804M06640 Yamaha YZ250 / YZ250X 2001-2022 *STD/66.4mm*
item 34 Wiseco Piston Kit 804M06640 Yamaha YZ250 / YZ250X 2001-2022 *STD/66.4mm*
$136.99
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WISECO 804M06640 PISTON STANDARD
item 35 WISECO 804M06640 PISTON STANDARD
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Wiseco Piston Kit 1999-2019 Yamaha YZ250/X Piston Ring Clips Pin Std 66.4mm Bore
item 36 Wiseco Piston Kit 1999-2019 Yamaha YZ250/X Piston Ring Clips Pin Std 66.4mm Bore
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Wiseco 804M06640 2 Stroke Pro-Lite Piston Kit 66.40mm Bore For YZ250X 2T 16
item 37 Wiseco 804M06640 2 Stroke Pro-Lite Piston Kit 66.40mm Bore For YZ250X 2T 16
$138.97
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Wiseco 804M06640 Piston Kit Standard Bore 66.40mm Yamaha YZ250 1999-2022
item 38 Wiseco 804M06640 Piston Kit Standard Bore 66.40mm Yamaha YZ250 1999-2022
$138.97
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Wiseco 804M06640 Piston Kit - Standard Bore 66.36mm
item 39 Wiseco 804M06640 Piston Kit - Standard Bore 66.36mm
$139.33
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1999-2023 Yamaha YZ 250 X Wiseco 66.40 mm STD BORE Forged Piston Kit
item 40 1999-2023 Yamaha YZ 250 X Wiseco 66.40 mm STD BORE Forged Piston Kit
$142.34
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Wiseco ProLite Piston Kit for 99-23 Yamaha YZ250
item 41 Wiseco ProLite Piston Kit for 99-23 Yamaha YZ250
$142.38
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Wiseco 804M06640 Piston Kit, Standard Bore 66.40mm
item 42 Wiseco 804M06640 Piston Kit, Standard Bore 66.40mm
$143.96
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WISECO 1999-2017 YZ250 Yamaha PISTON KIT PRO-LITE 66.40/STD YAM 804M06640
item 43 WISECO 1999-2017 YZ250 Yamaha PISTON KIT PRO-LITE 66.40/STD YAM 804M06640
$145.15
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WISECO 2016-2017 YZ250X Yamaha PISTON KIT PRO-LITE 66.40/STD YAM 804M06640
item 44 WISECO 2016-2017 YZ250X Yamaha PISTON KIT PRO-LITE 66.40/STD YAM 804M06640
$145.15
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WISECO 2018 YZ250X Yamaha PISTON KIT PRO-LITE 66.40/STD YAM 804M06640
item 45 WISECO 2018 YZ250X Yamaha PISTON KIT PRO-LITE 66.40/STD YAM 804M06640
$145.15
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WISECO 2019 YZ250 Yamaha PISTON KIT PRO-LITE 66.40/STD YAM 804M06640
item 46 WISECO 2019 YZ250 Yamaha PISTON KIT PRO-LITE 66.40/STD YAM 804M06640
$145.15
Free shipping
WISECO 2019 YZ250X Yamaha PISTON KIT PRO-LITE 66.40/STD YAM 804M06640
item 47 WISECO 2019 YZ250X Yamaha PISTON KIT PRO-LITE 66.40/STD YAM 804M06640
$145.15
Free shipping
WISECO 2018 YZ250 Yamaha PISTON KIT PRO-LITE 66.40/STD YAM 804M06640
item 48 WISECO 2018 YZ250 Yamaha PISTON KIT PRO-LITE 66.40/STD YAM 804M06640
$145.15
Free shipping
Wiseco Pro-Lite Piston Kit 66.40mm For 1999-2022 Yamaha YZ250
item 49 Wiseco Pro-Lite Piston Kit 66.40mm For 1999-2022 Yamaha YZ250
$145.17
Free shipping
Wiseco Pro-Lite Piston Kit 66.40mm For 2016-2022 Yamaha YZ250X
item 50 Wiseco Pro-Lite Piston Kit 66.40mm For 2016-2022 Yamaha YZ250X
$145.17
Free shipping
Wiseco Pro-Lite Piston Kit 66.40mm For 2016 Yamaha YZ250X 2T
item 51 Wiseco Pro-Lite Piston Kit 66.40mm For 2016 Yamaha YZ250X 2T
$145.17
Free shipping
Wiseco Pro-Lite Piston Kit 66.40mm For 2017 Yamaha YZ250X
item 52 Wiseco Pro-Lite Piston Kit 66.40mm For 2017 Yamaha YZ250X
$145.17
Free shipping
Wiseco Pro-Lite Piston Kit 66.40mm For 2004 Yamaha YZ250
item 53 Wiseco Pro-Lite Piston Kit 66.40mm For 2004 Yamaha YZ250
$145.17
Free shipping
Wiseco Pro-Lite Piston Kit 66.40mm For 2014 Yamaha YZ250
item 54 Wiseco Pro-Lite Piston Kit 66.40mm For 2014 Yamaha YZ250
$145.17
Free shipping
Wiseco Pro-Lite Piston Kit 66.40mm For 2018 Yamaha YZ250X
item 55 Wiseco Pro-Lite Piston Kit 66.40mm For 2018 Yamaha YZ250X
$145.17
Free shipping
Wiseco Pro-Lite Piston Kit 66.40mm For 2005 Yamaha YZ250
item 56 Wiseco Pro-Lite Piston Kit 66.40mm For 2005 Yamaha YZ250
$145.17
Free shipping
Wiseco Pro-Lite Piston Kit 66.40mm For 2015 Yamaha YZ250
item 57 Wiseco Pro-Lite Piston Kit 66.40mm For 2015 Yamaha YZ250
$145.17
Free shipping
Wiseco Pro-Lite Piston Kit 66.40mm For 2019 Yamaha YZ250X
item 58 Wiseco Pro-Lite Piston Kit 66.40mm For 2019 Yamaha YZ250X
$145.17
Free shipping
Wiseco Pro-Lite Piston Kit 66.40mm For 2006 Yamaha YZ250
item 59 Wiseco Pro-Lite Piston Kit 66.40mm For 2006 Yamaha YZ250
$145.17
Free shipping
listings for this product

Ratings and Reviews

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4.9
16 product ratings
  • 15 users rated this 5 out of 5 stars
  • 1 users rated this 4 out of 5 stars
  • 0 users rated this 3 out of 5 stars
  • 0 users rated this 2 out of 5 stars
  • 0 users rated this 1 out of 5 stars

Would recommend

Good value

Good quality

Most relevant reviews

See all 12 reviews
  • by ghettorat13
    Jul 24, 2025

    This piston is wiseco quality and easy t...

    This piston is wiseco quality and easy to install. The description is accurate and a great value. Fast shipping as well.

    Verified purchase: YesCondition: Pre-owned

  • by walspra73
    Sep 30, 2022

    YZ250 2012 no issues

    Product is as described. Ran the break-in process and had the bike out at the track. No issues. Like always be sure to check your ring gap. I had to file mine meet the clearance for myYZ250. Of course it really comes down to cylinder wear but either way good to check!

    Verified purchase: YesCondition: New

  • by bombero177
    Jan 06, 2016

    Wiseco piston

    I highly recommend it, been using it on my 2001 YZ 250 and it feels awesome. Great product.

    Verified purchase: YesCondition: New

  • by bruce7484
    Dec 17, 2024

    perfect piston with all the gaskets and ...

    perfect piston with all the gaskets and o-rings to install top end my yz250 is doing to rip with the fresh motor.

    Verified purchase: YesCondition: New

  • by 7.31_25
    May 22, 2025

    Should work for me. I had to clean up a ...

    Should work for me. I had to clean up a small nick at the bottom of skirting.

    Verified purchase: YesCondition: New

  • by nolaklink-0
    Jun 13, 2017

    Yz 250 piston

    Awsome product tight specs snappier throttle response

    Verified purchase: YesCondition: New

  • by trailman006
    Jan 12, 2016

    Wiseco Piston Kit

    Quality in fit and function.

    Verified purchase: YesCondition: New

  • by kingatvrepair
    Nov 01, 2017

    Piston

    Good quality

    Verified purchase: YesCondition: New

  • by 405kingvirgo
    Jul 08, 2025

    Perfect fit...

    Perfect fit

    Verified purchase: YesCondition: New

  • by fran.herre
    Dec 12, 2016

    This is the product I wanted, and it came very quickly, I'm very pleased

    Verified purchase: YesCondition: New

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