250-500cc How easy is a piston change on a 2011 WR250?

What parts are best to use, genuine husqvarna or aftermarket?
Would it be an easy job for an average person?

Very Easy...every 125 rider needs to learn. Have an experienced friend help you.

You need 12mm wrench 8mm socket and a screwdriver.

Take off pipe, drain coolant. remove rad hoses pop powervalve cover and pry off PV arm with screwdriver

Unbolt head and cylinder bolts then pull up cylinder.

stuff rag under piston....pry out circlips, remove piston.

fit new piston with circlip already in one side.

push in piston pin then pop in other circlip (use new circlips)

put ring on with markings up.

compress ring with hand over locating pin on piston in back while buddy slides cylinder on.

bolt everything back on.

kickstart bike and warm it up.

let it cool overnight.

restart next day and ride.

Don't forget to put a light coat of 2 stroke oil on the new piston, pin, cylinder wall before reassembly.

and put coolant back in it before starting