Well, this is a classical example of a law with good intentions gone amok. Protecting children from lead is a good cause, but attempting to put a blanket statement on all "children's products" without carefully investigating what exactly a "children's product" is, let alone what contains more than 600ppm of lead (which basically could be almost anything metallic under the hood of a vehicle let alone other things that children would never routinely attempt to suck, chew or swallow) results in situations like this.
Interesting that what started this whole scare were the flurry of consumer alerts in the last three years over Chinese children's toys that were found to be stuffed full of lead, melamine, PCB's and other nice and fluffy agents. And the rush to action, however noble, wound up with an umbrella law that makes small displacement motorcycles illegal.
We complain sometimes about how slow Washington DC is at enacting new laws... sometimes, such as in this case, they're just not slow enough.