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Engine acting wierd

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I got a 06 400Sm (3x3 w/155jet Yoshi R3) with about 1,500 miles on it. It's been stalling on me after it's warmed up and if I give it a quick roll on the throttle in neutral. Also, when I shut down the engine is making a hissing noise? Any idea's guys? Thanks

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I think I found the problem. The rubber thing that attaches the air box to the carb. Well I found that theres a nipple on top of that and it came disconnected some how. Do you think that's the problem. I have 1 hose in my carb that dosen't go anywhere. (overflow maybe?)

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