A 1/2" drive air-powered impact wtrench will buzz it right off. You can hold the flywheel with your hand to keep it from spinning. A high-quality 3/8" drive impact will do it too.
If you don't have air tools handy take the spark plug out and feed about about 6" of 3/8" or 5/16" nylon rope onto the cylinder (leave the end hanging out so you don't lose it. It will lock up the engine when the piston comes up against it and shouldn't cause any damage.
It would be better to just load it up and pay someone at the local repair shop to buzz the nut off with air tools. Good luck.
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jeff
'00 XC250 (mine)
LTS front and rear suspension, power valve cover, carb jet kit and rear chain glide, RB Designs head mod, BRP tall triple clamp, backyard foot-peg lowering conversion.
'04 EC250 (the kids)
(he can do his own mods haha!)
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