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Tanis

Wr 426 exploded

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ImageUploadedByThumper Talk1384777477.497291.jpg

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Small end failed and took out the

Bore and cases are stuffed. head is untouched i wonder how it escaped damage? I wonder what caused it to fail the bore looks good other than the hole.

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Looks like the piece that broke off the piston end of the rod went straight down to the lower end and got between the case and the lower end of the rod. When the rod came around it pushed the broken piece through the case. The cylinder was just lucky that the broken end of the rod didn't catch it when it was flailing around. I had a CR500 that had a piece of the piston skirt break off. The piece went down and the lower end of the rod pushed it into the tranny. Have a local guy that was able to weld and rebuild the case. Worked great after that.

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I don't think this one going to go again, but i think your spot on with what happened. I picked this up for parts its interesting to see why stuff fails. I think they should have changed that rod last time.

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