"I am a two stroke guy from way back"-probably not as far back as me since I started riding(legally
) in 1964!
The TZ is amazingly reliable for a stroker-500 miles at race pace on pistons and rings without any significant deteriation in performance-it does use clutches though-but that's all part of getting a race stroker off the line quickly. The pistons don't seem to wear out-I just worry about the skirt dropping off. The older parrallel twins used to eat rings and pistons but the 'V' twins seem much easier on parts.
Mind you mine is an Avgas engine-I believe they use pistons much harder on unleaded, and are more liable to seize.
John