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Have you tried penetrating oil, like Liquid Wrench? Personally, I would try that along with heating the bolt (not too hot) with a propane torch. Liquid Wrench, heat, more Liquid Wrench, sit for a while, more Liquid Wrench, more heat, sit for a bit & try again. If you're that worried about the flame, maybe try heating it with a soldering gun? I actually used Liquid Wrench without heat on my KZ440 after I snapped the chain, but that wasn't easy! (Had to make a tool out of the broken chain & a 2x4 to hold the sprocket in place, & I didn't have a proper breaker bar at the time. Bent some pieces of pipe on that one.) The KZ400 was a lot easier, as the chain was still on the bike & the nut was actually scary loose.
HTH,
-Kit
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