Instructions would certainly be helpful, but once you know what you're doing it's not that hard. Every bolt, except for the oil breather, must be coated with Loctite. All of the screws on the lid are only about 1/8" and were all loose when I took the lid out of the box. Loctite seemed to hold everything in place when the air filter was inspected after a 50 mile ride. So far I'm definitely happy with it. If my opinion changes, I will update this review.
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