Did he have the engine checked for alignment, usually if the pistons seized, the damage can be more to the sleeve or the hole head, the aline ment would need checking.
SOURCE: what is a good carb set up on a 2005 yz125 with
this will depend on what gas oil mixture you have
check this topic out.
http://www.dirtrider.net/forums3/showthread.php?threadid=117838
http://forums.dirtrider.com/70/7640379/yamaha-dirt-bikes/yz125-carb-settings/index.html
regards,
voodoo
SOURCE: 1985 xl250r honda road/trail twin carby
There is only a manual for an XR250 but it may have the information you need. Go to http://www.carlsalter.com/motorcycle-manuals.asp , and download a (free) manual.
SOURCE: 99 yz125 burning off piston edge at high rpms
Higher octane fuel is needed from what you describe. Without knowing where you are located and how hard you ride the bike, it's impossible for anyone to offer any jetting advice. Higher octane fuel will likely help, but if you (or a previous owner perhaps) have shaved the head for higher compression, you might have to run higher octane racing fuel.
Also - check to make sure the pipe is sealed well at the head pipe connection - if not, it will **** air at high RPM and can cook your piston.
Check also for leaking crank seal on the flywheel side (left) which can also **** air but will normally be accompanied by a very irradic idle.
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