Two stroke cylinders are hard on boring tools. The interrupted cut beats the hell outta carbide. That's why I prefer to hone .010"/.025MM. If it needs more than that boring is OK but I'd rather not. Modern stones can take a lot of material out fast. Sometimes with cast in liners boring is needed to square the bore up. Yamaha is particularly bad with that.
you don't see luggage racks on a hearse..........act accordingly