Yamaha tz 125 he claims a new piston every weekend. I keep looking for fantic 280 trials bike hummm sexy
carbs do wear out for sure, and i think alot of it is the oft overlooked needle jet. mine was a oem for 95 tmx mikuni that was not original to the bike but correct set fairly close to book spec.. its in very nice shape but it just goes to show how nice the lectron operates!
The one I know of is off of my old bike, it's got some light scoring and scuffing on the cylinder wall but had no compression loss, the head is perfect. BMP has it, it's for sale as far as I know.