Ready to install, direct bolt on cylinders require no plating and look virtually identical to the OEM cylinder
Cylinder kits include matched Vertex pistons to ensure longevity, performance and reduced engine noise
Nickel silicon carbide plated for long life
Kits come complete with gaskets, cylinder, piston, rings, pin and clips
Most big bore cylinders do not require machine work, unless noted
Product Note:
Specification
Details
Bore
Varies (make selection above)
Compression Ratio
Varies (make selection above)
Country of Origin
Varies (make selection above)
Displacement
Varies (make selection above)
Material
Varies (make selection above)
Size Over Standard
Varies (make selection above)
Vehicle Fitment
Fitment is guaranteed or your money back plus free return shipping.
Don’t waste time installing a product that doesn't fit. We worked hard ensuring that this product is an exact fit on the vehicles listed below.
Arctic Cat
DVX 400 2004-2008
Gas Gas
EX 350F 2021-2022
MC 350F 2022
Honda
CRF150R 2007-2009, 2013-2023
CRF150R Expert 2007-2009, 2012-2019
CRF250R 4-Stroke 2004-2024
CRF250RX 4-Stroke 2019, 2022-2024
CRF250X 4-Stroke 2004-2009, 2012-2017
CRF450R 2002-2024
CRF450RWE 2021-2024
CRF450RX 2017-2019, 2021-2024
CRF450X 2005-2009, 2012-2017
TRX450ER Sportrax 450ER 2006-2014
TRX450R Sportrax 450R 2004-2009
TRX700XX 2008-2009
Husaberg
FE 250 2014
Husqvarna
FC 250 2016-2022
FC 350 2016-2022
FE 350 2020-2022
FE 350 S 2021-2022
FX 350 2019-2022
KTM
250 SX-F 2005-2022
250 XC-F 2007-2022
250 XCF-W 2006-2014
350 EXC-F 2020-2022
350 SX-F 2011-2022
350 XC-F 2011-2022
350 XCF-W 2021-2022
Kawasaki
Brute Force 750 4x4i 2005-2021
Brute Force 750 4x4i EPS 2015-2023
KFX400 2003-2006
KLX400R 2003-2004
KX250 4-Stroke 2019, 2021-2024
KX250F 4-Stroke 2004-2018
KX250X 4-Stroke 2021-2023
KX450F 2009-2015
Teryx 750 4x4 2008-2013
Teryx KRX 1000 2020-2023
Polaris
ACE 900 XC 2016-2019
General 1000 2016-2019
RZR 4 900 2014-2016
RZR 800 2008-2014
RZR 900 2014-2019
RZR RS1 2018-2019
RZR S 1000 2016-2019
RZR S 900 2015-2019
RZR XP 1000 2014-2019
RZR XP 4 1000 2014-2019
RZR XP 4 900 2012-2013
RZR XP 4 900 Jagged X 2013
RZR XP 900 2011-2013
Ranger 800 2010-2011, 2013-2014
Ranger Crew 900 2014-2016
Ranger Crew XP 1000 2017
Ranger Crew XP 900 2017-2019
Ranger XP 900 2013-2019
Sportsman 800 EFI 2005-2014
Suzuki
DR-Z400 2000-2004
DR-Z400E 2000-2007
DR-Z400S 2000-2024
DR-Z400SM 2005-2009, 2012-2021, 2023-2024
LT-R450 QuadRacer 450 2006-2009
LT-Z400 QuadSport 400 2003-2014
RM-Z250 2004-2024
Yamaha
Grizzly 700 4x4 2007-2015
Raptor 700 2013-2018
Raptor 700R 2006-2009, 2011-2023
Rhino 700 FI 4x4 2008-2009, 2011-2013
Viking 700 2014-2017
Viking 700 VI 2015-2023
WR250F 2001-2013, 2015-2024
WR450F 2003-2018, 2021-2023
YFZ450 ATV 2004-2009, 2012-2013
YFZ450R ATV 2009-2023
YFZ450X ATV 2010-2011
YZ250 2-Stroke 1999-2024
YZ250F 4-Stroke 2001-2024
YZ250FX 4-Stroke 2015-2024
YZ450F 2003-2022
YZ450FX 2016-2023
YZ85 2002-2018
Customer Reviews
Big bore kit 2003 wr450f
By Randolph B. on
Verified Purchaser
Installed big bore kit on 2003 wr450f.
Fit as it should. Happy with the purchase.
Big bore power
By Mike on
Just what I need to get that much more grunt out of my bike. Awesome kit!
How many stars would you give this product? Write a review.
Questions & Answers
What brand of piston comes with the kit?
By RPM955
Cylinder Works big bore cylinder kits come with Vertex pistons.
Will this fit on a stock 2002 yamaha 250 2 stroke
By Anon.
Yes, when choosing the kit to fit the 2002 YZ250 two-stroke, you would simply be installing the kit in place of the stock components. No machining or any other special parts would be needed.
Do the cylinder heads need to be bored to match the jugs?
By Frank
It is not necessary to have the head machined in order to use the big bore cylinder kit. Depending on what machine you are installing it on, you may need to machine the cases. Once you select your machine before adding to cart, it would mention if that is necessary.
I'm looking at getting this bore kit for my 2009 Kx250f what else should I also get new cams as well
By Tim
Cylinder Works Big Bore Kits are designed to work with OEM or any aftermarket cams that fit the OEM cylinder head. Just be sure to choose the correct cam for the kind of power you're looking for and you should be all set!
2007 crf150rb when using this big bore kit do I need to replace my cylinder head as well??
By Jeff
The CRF150RB's big bore cylinder kit works with the OEM cylinder head. There's no need to replace it. Though, since you've got everything torn down, you might as well have some head work done as well and take advantage of that extra displacement.
Big bore kit additional parts
By Anon.
I have a 2007 yz450f. What aother engine parts should I change to get the most out of the big bore kit? Thanks.
I would suggest looking at the Hot Rods Stage 2 Camshafts for your 2007 Yamaha YZ450F. When used in conjunction with the Cylinder Works Big Bore Cylinder Kit this will give you a larger boost in performance over the stock cam profiles. You can find those cams by simply searching our store for "Hot Rods Stage 2 Exhaust Camshaft" and "Hot Rods Stage 2 Intake Camshaft"
Can i change my cam to a stage three without having to change anything else or what should i do?
By nick
When you install big bore cylinder kit it's recommended to change your cams as well. Any time you change the displacement of the engine, you should match the valve diameter and cam lift to to the bigger set up if you want to get the most power out of the new set up.
Let us know what you'r working with and our team will be happy to help you find a complete kit with everything you need to get the most power from your ride.
Have a question? Please ask our experts and customers who own this product.
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