Built by us: Dynamic Engine Factory. Completely rebuilt 2009 Yamaha YZ450F. Customer didn't want to spend the money to rebuild it so we bought it off him and went through it just like a race engine. If you are seriously interested I will share the complete invoice breakdown with you. There is far too much to list. Some basics about the engine and parts that are new. Vapor Blasted, Cerakoted covers, Rebuilt Crank with PROX Rod Kit, JE Piston Kit, cylinder, cam chain, valves bearings and seals (yes all of them), 2 Trans Gears, shift shaft, Clutch basket, ported and decked head (Pump gas friendly), EBC Clutch Pack, upgraded bearing retainer screws, BOLT Hardware Kit, Zeta drain bolts, KPMI guides. All work done in house. Ask for the invoice if you are actually serious and I will be happy to share it via email. We offer a limited warranty with conditions. You must contact us first if anything happens. Price includes shipping with insurance directly to you. We will also toss in a couple shirts and steeekers.