No issue, just move to another security check point if they don’t like what u have. In general if u make sure it’s completly cleaned so no nitro is easily detected by smell you should be fine. Most of the guys will be pumped to see a cool toy come threw! I am a professional dirtbike racer and walk threw the airport with gear that could hurt someone and they don’t care 40 out of 42 weekends n when they do I put my boots on my feet as normal footwear. Tsa is flexible with what they see as long as it doesn’t cause major precautionary issues. Just be a good guy and go do what u are traveling for and they will be cool. If u wanna be safe clean out your diffs, the rest is plastic and metal toy parts. Don’t bring anything liquid or excessive, keep it simple with a car starter box and radio, the rest u can pick up.