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yamaha starving for air

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Hi I have a 2005 yamaha 400 big bear. When I run it without the breather cover on it runs good. This is without the air filter. As soon as I put the lid on and snap it down tight I have no middle or high rpm. Any ideas. I've checked the pipes from the air breather and all are clear. No animals nesting in them.

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Dream Car Giveaway

Shifter shaft was broken so it sat for awhile. So with it sitting so long I figured I would clean the carb when I received the new shifter shaft and installed it. I noticed the intake rubber manifold is hard now with some tiny cracks. I'm guessing it's starting to get old.

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