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What are the engine cases made of?

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Yesterday I got a crack in the left side engine case and I'm wondering what the cases are made of? Can it be welded or is it magnesium? It's an '09 KX450 thanks

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Edited by dennis391

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It can be welded. You need to split the cases and take to a welder who specializes in aluminum. Also clean all the oil off with a non chemical degreaser like simple green. Solvents like carb cleaners react with the heat and argon shielding gas and produce toxic fumes that can kill.

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Alright sweet. I will tear it down this week and get it welded then. Thanks for the replies guys!

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