The Best honda 400ex big bore kit of 2021 – Top 10 and Rankings

If you’re looking for honda 400ex big bore kit but don’t know which one is the best, we recommend the first out of 10 honda 400ex big bore kit in this article. Check out how we decide after hours of researching and comparing dozens of items on the market.

Rank No. #1
TOP NOTCH PARTS 440cc BIG BORE CYLINDER PISTON RINGS TOP END KIT FITS HONDA TRX400EX TRX 400EX 99 00 01 02 03 04 05 06 07 08
  • REPLACES OEM NUMBER 12100-KCY-670 12191-KCY-672 13011-KCY-670 13101-KCY-670 90601-KA5-000 13111-KCY-670 12251-HN1-003 12391-KCY-671 14560-KCW-851
  • HONDA TRX 400EX 440cc BIG BORE CYLINDER PISTON TOP END KIT
  • PISTON TOP HAS A CERAMIC COATING PROVIDING SUPERIOR HEAT RESISTANCE WHICH WILL EXTEND THE LIFE SPAN OF THE PISTON. * THIS IS THE BEST QUALITY KIT ON EBAY! EQUAL TO OR BETTER THAN OEM
  • PURCHASE INCLUDES: 1X CYLINDER 1X PISTON. 1X PISTON PIN. 2X CIRCLIPS. 1X COMPLETE SET OF RINGS. 1X HEAD GASKET. 1X BASE GASKET. 1X HEAD COVER GASKET. 1X CHAIN TENSIONER GASKET. 1X GASKET MAKER. 1X THREAD LOCK. 1X FUEL FILTER. 1X OIL FILTER. 1X FREE NGK SPARK PLUG
  • PARTS FIT: 1999 - 2008 HONDA TRX 400EX.
Rank No. #2
Wingsmoto Complete Gasket Kit Replacement for TRX400EX TRX 400 EX Sportrax 1999-2004
  • 180 days warranty and 100% money back guarantee if not satisfied.
  • Fit TRX400EX Sportrax 1999-2004
  • Aftermartet Replacement Complete Gasket Kits are made from the highest quality materials available.
  • Kits come complete with all necessary gaskets to completely rebuild the top and bo ttom end on your motorcycle or ATV.
Rank No. #3
89mm 440cc Big Bore Cylinder Piston Gasket Kit for Honda Sportrax TRX400EX 99-08
  • The cylinder Bore and Stroke is 89 mm x 70 mm
  • The cylinder Displacement 440cc / Compression 10:1
  • This product is tested to Exceed Original Equipment Standards and Performance
  • This product includes Piston Kit, Gasket Kit, OE Type Cylinder
  • The products are direct Replacement Parts for Hassle-Free Installation
Rank No. #4
NICHE 85mm 397cc Cylinder Piston Gasket Top End Kit For Honda Sportrax TRX400EX TRX400X XR400R 1996-2014
  • Replaces OEM Part Numbers: Honda 12100-KCY-670, 12100-HN1-A70,13101-KCY-670, 13011-KCY-670,13111-KCY-670, 90601-KA5-000,12251-HN1-003, 12251-HN1-A41,12191-KCY-672,12191-KCY-671,12191-HN1-A71
  • Compatible with Honda 1996-2004 XR400R, 1999-2008 Sportrax TRX400EX, 2009, 2012-2014 TRX400X
  • Includes Cylinder, Cylinder Head, Cylinder Head Cover, Piston, Piston Rings, Wristpin, Circlips
  • Head Gasket, Base Gasket, Head Cover Gasket, Chain Tension Gasket, O-Ring and Spark Plug
  • 85mm x 70mm Bore and Stroke, 9.1:1 Compression, 397cc Displacement
Rank No. #5
labwork New 89MM Big Bore Top End Gasket Fit for Honda TRX400EX TRX 400EX 440
  • New 89mm big bore top end gasket fit for Honda TRX400EX TRX 400EX 440
  • New & High Quality
Rank No. #6
labwork 89mm Cylinder Piston Gasket Rebuild Kit Replacement for 1999-2008 Honda Sportrax TRX400EX TRX 400EX 13101-KCY-670 12191-KCY-672
  • Replacement for: 1999-2008 Honda Sportrax TRX400EX
  • Part Number: 12100-KCY-670, 12191-KCY-672, 13011-KCY-670, 13101-KCY-670, 90601-KA5-000, 13111-KCY-670, 12251-HN1-003, 12391-KCY-671, 14560-KCW-851, 12100-HN1-A70, 12191-KCY-672
  • The piston is made of strong aluminum, piston rings are semi-nitrided, with excellent wear resistance, fatigue resistance, corrosion resistance and high temperature resistance, cast piston has super-high silicone content for additional strength, piston skirts are Molybdenium Teflon coated to minimize resistance/wear and provide extended life, piston dome is anodized for superior heat resistance and longer lifespan
  • Product Specification: 89 mm x 70 mm bore and stroke, 440cc displacement, 10:1 compression
  • If you are unsure whether the model is applicable, please contact us before placing your order
Rank No. #7
WFLNHB 85mm Cylinder Piston Gasket Rebuild Kit Replacement for 1999-2008 Honda Sportrax TRX400EX TRX 400EX 12100-HN1-A70 12191-KCY-672
  • Replacement for: 1999-2008 Honda Sportrax TRX400EX
  • Part Number: 12100-HN1-A70, 12191-KCY-672, 13011-KCY-670
  • The kit includes brand new cylinder, piston, piston pin, circlips, complete set of rings, head gasket and base gasket as pictured shown, this is a direct bolt on kit that will require no modifications
  • Product Specification: 85 mm x 70 mm bore and stroke, 397cc displacement, 9.1:1 compression
  • We guarantee a great fit and this kit includes the best warranty. Quality and performance is guaranteed
Rank No. #8
Wiseco W5942 Big Bore Replacement Gasket Kit - Fits: Honda TRX 400EX 1999-2008
  • Fits: Honda XR400 440 Overbore 1996-04, XR400 (87-88mm bore) 1996-05, TRX400EX (87-88mm bore) 1999-08, TRX400X (87-88mm bore) 2009-12
  • Contains all the necessary gaskets and O-rings to rebuild your top end
  • Wiseco gasket kits are made from the highest quality materials and engineered by Wiseco to insure compatibility with Wiseco pistons and crankshafts
  • Each gasket kit is sourced in-house to find the most reliable, high quality suppliers available
  • Ensures a critical seal and superior durability that meets and exceeds OEM specifications
Rank No. #9
85mm 397cc Cylinder Piston Gasket Top End Kit for Honda Sportrax 400EX TRX400X 1999-2008 12100-KCY-670 12191-KCY-672 12100-HN1-A70
  • Fit for Honda Sportrax 400 TRX400EX 1999-2008
  • Replace OEM Parts Numbers:12100-KCY-670,12191-KCY-672,13011-KCY-670,13101-KCY-670,90601-KA5-000,13111-KCY-670
  • Replace OEM Parts Numbers:12251-HN1-003,12391-KCY-671,14560-KCW-851,12100-HN1-A70,12191-KCY-672
  • Package Contents:1 x Cylinder,1 x Piston,1 x Piston Pin,1 x Spark Plug,2 x Circlips,1 x Head Gasket,1 x Base Gasket,1 x Head Cover Gasket,2 x Piston Rings
  • 85 mm x 70 mm Bore and Stroke
Rank No. #10
WFLNHB New Big Bore Cylinder Piston Rings Top End Kit for 1999-2008 Honda Trx400ex 440cc
  • Big Bore Cylinder Piston Rings Top End Kit for 1999-2008 Honda Trx400ex 440cc
  • Replaces Part :12100-KCY-670 12191-KCY-672 13011-KCY-670 13101-KCY-670 90601-KA5-000 13111-KCY-670 12251-HN1-003 12391-KCY-671 14560-KCW-851
  • Package Including:1x Cylinder 1x Piston. 1x Piston Pin. 2x Circlips. 1x Complete Set of Rings.
  • 1x Head Gasket. 1x Base Gasket. 1x Head Cover Gasket. 1x Chain Tensioner Gasket.
  • 1x Gasket Maker. 1x Thread Lock. 1x Fuel Filter. 1x Oil Filter. 1x Free Ngk Spark Plug.

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