99+ Yamaha YZ250 YZ 250 72mm 295 cc Big Bore Cylinder Piston Top End Rebuild Kit

99+ Yamaha YZ250 YZ 250 72mm 295 cc Big Bore Cylinder Piston Top End Rebuild Kit

21009-K01, MX-09153K, CBK0135, 4138, 808670, 822304, K012, 811670,21009-K01, 21009, CBK0135, 4138, 808670, 822304, K012, 811670, 24079B, 204543447645, PWR134-100, WB1157, PK1573, WPC126, NX-40025-BK, 5CU-11351-00, 5CU-11993-00, 5CU-11354-00, 93210-15639-00, 93210-53638-00, 5NX-13622-00, 90116-08394-00, 90176-08026-00, 90201-08087-00, WPC134, NX-40025, NX-40031T, MX-09153K, 21009-G01

Cylinder Works Complete BIG BORE Top End Rebuild Kit!

This is the BEST, MOST RELIABLE big bore top end kit on the market!

Fits Yamaha YZ250 2 Stroke Dirt Bikes 

Years 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024

Cylinder Works Big Bore Cylinder Kit

295cc +5.60mm Big Bore Cylinder Kit

This Rebuild Kit Includes:

  • Cylinder Works 72mm 295cc Big Bore Nikasil Plated Cylinder
  • Vertex Forged Moly Coated 72mm Big Bore Piston Kit (Includes, Piston, Pin, Rings & Clips) (Perfect For Pump Gas)
  • Wiseco or Wossner Piston Kit Upgrade Available! Please contact us for availability and price.
  • Big Bore Cylinder Head with Big Bore Power Valve Kit
  • Vertex Complete Big Bore Top End Gasket Kit
  • Hot Rods Piston Wrist Pin Bearing

This is a bolt on kit with no machining required.  All parts come with warranty.

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

BRAPPPPPPPPPP!

21009-K01, MX-09153K, CBK0135, 4138, 808670, 822304, K012, 811670,21009-K01, 21009, CBK0135, 4138, 808670, 822304, K012, 811670, 24079B, 204543447645, PWR134-100, WB1157, PK1573, WPC126, NX-40025-BK, 5CU-11351-00, 5CU-11993-00, 5CU-11354-00, 93210-15639-00, 93210-53638-00, 5NX-13622-00, 90116-08394-00, 90176-08026-00, 90201-08087-00, WPC134, NX-40025, NX-40031T, MX-09153K, 21009-G01

PROFESSIONAL INSTALLATION REQUIRED

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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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