On the heels of Southside Honda's closure (aka Troy Racing): I picked up a locked-up 2003 YZ 125 from their "warehouse" for $400. The piston let go at very high RPM and took out the crankshaft and cylinder. I have a bottom end "kit" coming from a retiring kart racer for $170. Now the BIG question: Do I go for an Athena 144 kit or go back to stock. Keep in mind I am doing my own work (Certified H, Y, S mechanic for many, many years) and I am a cheapskate. At least I'm honest. Bike already has a PC exhaust, PC suspension, Hinson clutch basket and pressure plate and a VForce reed cage. Anyone have experience with the Athena bolt-on kits? Any other tips or pitfalls of this era YZ?