Every bag, whether checked or carry-on, is x-rayed at LAX. If they don't like what they see, the TSA nazis will open the bag/container, forcefully if necessary. and not in your presence.
If, Tooty, you were really were thinking this is a carry-on item, well...... On the other hand, Tooty, if you are simply aware of the 100% x-raying for checked bags and making queries; well, I don't think you'll have a problem. I'm sure the TSA have seen bikes before.
I would, however, make sure all loose parts are securely packed in one or two larger plastic bags, within the package, just in case someone does want to open it and inspect. That'd minimise the chances of one or two small bits slipping out.
But yes, as someone else said, just ring Malaysian for details. I'm sure they'll have more advice.