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Blaster crankshaft question

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Hey all I recently got apart an 04 blaster mostly stock and have got down to the crank. The cylinder had minor scoring and none at all on piston yet when I saw the crank it had weird marks on part of the crank? Does anyone know if this is normal or if I need a new crank? ImageUploadedByThumper Talk1402853223.372250.jpgImageUploadedByThumper Talk1402853243.406186.jpg

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I know this is a bit of an older thread, and since noone has replied, I will. If you are referring to the bluing in the counter weights, that is normal. If the connecting rod has any up and down play in it, it needs to be rebuilt. Some side to side play is normal also. If you feel and clunking or grinding in the main bearings or rod bearing, replace the the mains and rebuild the crank. If it rotates smoothly, you are fine.

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