Cylinder Works 99mm Big Bore Kit – TRX450R / TRX450ER 500cc
Cylinder Works Big Bore 99mm Cylinder Kit – Honda TRX450R / TRX450ER (477cc–500cc)
🛠️ Boost your Honda TRX450R or TRX450ER to serious power with this 99mm Big Bore Cylinder Kit from Cylinder Works. Designed for performance and reliability, this kit raises displacement to 477cc—or a full 500cc when paired with the Hot Rods stroker crankshaft (#0921-0041). Built for riders who want more torque, more top-end, and OEM-like fit and finish.
✅ What’s Included
-
99.00mm Big Bore Cylinder (Nickel Silicon Carbide plated)
-
Vertex Forged Piston Kit (piston, rings, wrist pin, and circlips)
-
Complete Top-End Gasket Kit
-
No case machining required
📦 Fitment
-
Honda TRX450R (2006–2009)
-
Honda TRX450ER Electric Start (2006–2009, 2012–2014)
🛡️ Warranty Info
Includes limited warranty against manufacturing defects. Not covered under warranty if used for racing, improper installation, or abuse.
🔑 Key Features
-
Increases displacement to 477cc or 500cc with stroker crank
-
99.00mm bore with 12.0:1 compression
-
Drop-in installation—no machining required
-
OEM-style aluminum casting and finish
-
Made in the USA for performance and durability
-
Perfect for aggressive trail, dunes, or racing builds
📦 Shipping Information
In-Stock Items:
- Most parts ship next business day
- Modquad parts: Monday–Thursday dispatch
Made-to-Order Items:
- Custom swingarms & A-arms: 2–4 weeks
- EVP exhaust systems: 2–4 weeks
- Sneakers: 1–2 weeks
Stock Guarantee: Items marked "In Stock" ship immediately. Made-to-order items are built fresh for you.
Questions? Contact us—we respond within 24 hours.
