Unleash the full performance of your Yamaha YFZ450 with this complete engine rebuild kit. Every component is brand new, in original packaging, and carefully selected from the most trusted brands in the industry to ensure you get the most complete and reliable kit available.
Whether you're racing, dune riding, or trail ripping, this kit gives you the durability and power you need — no modifications required.
OEM Crankcases (Brand New)
95mm Cylinder Works or Athena Big Bore Cylinder
CP, JE, or Wiseco Forged Piston**
High-Temperature Piston Rings
Wristpin + Circlips
Hotrods or Wiseco Crank with Rod**
Main Bearings
Transmission Bearings
Shift Cam Bearing
Water Pump Bearing (seal included in kit)
Complete Gasket Kit
Crankcase Oil Seal Kit
Valve Stem Seals
Aftermarket Oil Pump (07+ Upgrade)
Timing Chain
Heavy-Duty Clutch Kit
Head Stud Kit
Dune Goons Stickers
Runs on pump or race gas. All parts are brand new and backed by manufacturer warranty.
Fits ALL Yamaha YFZ450 carbureted models and years
We stand behind every kit 100%. Warranty applies only to parts installed by a qualified mechanic. Failures due to improper installation, tuning, or misuse are not covered. All warranty claims must be returned for inspection — no exceptions.
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!
Check us out on Instagram @Dune.Goons and give us a follow for full sends!
Download our Anthem Song by Mac Moss. Also available on Spotify, Amazon Music, and Pandora.