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Message: <blockquote data-quote="615kawi" data-source="post: 196005" data-attributes="member: 2592"><p>The spark plug was new when I installed the piston. My crank seals are also brand new. I recently restored the bike and everything was replaced. I think I may have found my issue. I think it's due to ring gap issues and cold seizure from improper break in.  I just looked at my replacement piston box. The part numbers are slightly different. I'm not sure why put here is a pic of both boxes. If you look at the number right above the bar code they are different. I'm not sure what this number is but it's also stamped on top the Piston. Maybe wiseco  just changed the part number? I know both pistons are the same size so it should be fine I would think. Here is a pic[ATTACH=full]27586[/ATTACH]</p></blockquote><p></p>