Cylinder Works 100mm Big Bore Kit – CRF450R (2002–2008)
🔧 Honda CRF450R Big Bore Cylinder Kit – 100mm / +4mm / 12.1:1 (2002–2008)
Upgrade your CRF450R’s top end with this complete Cylinder Works Big Bore Kit, featuring a 100mm (+4.0mm) high-performance cylinder and matching 12.1:1 compression Vertex piston kit. Designed to bolt on with no machining required, this kit delivers serious horsepower gains with OEM fit and finish.
Matched components ensure reliability, reduced engine noise, and extended longevity. Nickel silicon carbide plating resists wear, and the cylinder mimics the stock look while delivering race-level performance.
✅ What’s Included
-
Nickel Silicon Carbide–Plated Big Bore Cylinder (100mm)
-
Vertex Forged Piston (12.1:1 Compression)
-
Piston Rings
-
Wrist Pin & Circlips
-
Top End Gasket Kit (Valve stem seals not included)
📦 Fitment
Fits Honda CRF450R:
-
2002 CRF450R
-
2003 CRF450R
-
2004 CRF450R
-
2005 CRF450R
-
2006 CRF450R
-
2007 CRF450R
-
2008 CRF450R
No case machining required. Direct bolt-on installation.
🛡️ Warranty Info
No warranty is provided by Cylinder Works for performance parts. Professional installation and proper tuning required for best results.
We ship next day most of the time. Modquad parts are shipped Monday-Thursday. Engine Kits are 3-5 business days.
We don't do backorder! If your items has already sold you will be notified immediately and you money refunded on the spot.
Sold items are removed daily.
If you see it on this website, it is 100% in stock unless it just sold before you clicked buy.
If you call we answer, if you text we respond, if you have a question we respond. Sometimes we sleep so it could be next morning but we will respond.
Thank you for shopping with us! We appreciate you!
