Take your YZ250 to the next level with this complete 295cc big bore engine rebuild kit featuring top-tier components from Cylinder Works, Vertex, and Hot Rods. This is the most reliable and powerful bolt-on rebuild solution for your 2-stroke.
No case machining required—just bolt on and ride.
Cylinder Works 72mm Nikasil-Plated Big Bore Cylinder (295cc)
Vertex Forged Moly-Coated 72mm Piston Kit (rings, pin, clips) – pump gas friendly
Optional Wiseco or Wossner Piston Upgrade (contact us)
Big Bore Cylinder Head + Powervalve Kit
Vertex Top End Gasket Kit (Big Bore)
Hot Rods Heavy Duty Crankshaft Assembly w/ Rod
Hot Rods Wrist Pin Bearing
Hot Rods Main Crank Bearings + Seals
Vertex Complete Engine Gasket Set
Vertex Bottom End Oil Seal Kit
NGK Spark Plug
Fits all 2003–2024 Yamaha YZ250 2-Stroke Dirt Bikes
Includes standard and special edition models
All parts include manufacturer-backed warranties.
⚠️ Installation must be done by a qualified engine builder. Warranty is void if failure is due to improper install, tuning, break-in, or misuse.
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.
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