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Yz 250 2011 crankcase splitting! Help!

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SO .. heres the deal

I was racing today , very cold temperature , didn;t get much time to warm bikes before the start -pinned it down a fire road! boom! .. my bike locks up!

stopped, re -started it and it made a horrible grinding noise , no vibrations just the grinding noise. got home ,cleaned it, took engine out cylinder seems fine as does piston thank god. Tried getting cases apart , i have had them apart once already to put wr gears in. No way do they budge! bend the screw on my puller . Any suggestions how too free them up? and what do you recon on the seizure issue ? what caused it? bike had only done 35 hours. :bonk:

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