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any possible help please

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my friend is trying to rejet his snowmobile. it is a yamaha sx500r. we believe that it is running rich because now where he will be ridding is about 7500 ft higher than where he used to live. his sled has two mikuni 36 carbs both have 152.5 main jets i believe. the jets look the same as the ones that i have for my drz400 but i do not have any duplicates. does any one know what the best course of action would be to get his sled running right.

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