Can a yz125 be piston sleeved?

Yes, a Yamaha YZ125 can be piston sleeved, but it's not a common practice due to the design of the cylinder. Sleeving typically involves inserting a new liner into the existing cylinder, which may not always be feasible or cost-effective for a two-stroke engine like the YZ125. Instead, most riders opt for a complete cylinder replacement or a re-bore to a larger size. If considering sleeving, it's best to consult with a professional engine builder for advice specific to your situation.