NTHSA states a
motor-drive cycle is “a motorcycle with a motor that produces 5–brake horsepower or less.”[2] Since these mopeds are regulated by NHTSA, they cannot be imported into or sold in the United States without complying with the FMVSS.[3] I wonder if you can petition the NHTSA to expand this product category for the eMopeds/ecycles you sell but that allows a "motor rating" over 4,000 watts. The good news is that there does not seem to be a top speed capability identified as they probably know that 4,000W (albeit a rating so peak can kick up speed a bit vs nominal) is going to keep this catagory as urban mobility.
If you want to have more power and not be a motorcycle you would likely have to petition the NHTSA to consider an increase in power but I think that would be unlikely to happen. Take that definition and focus on IDing the states that have friendly registration and insurance requirements for motor-drive cycles. Your "off-road" Denzels can be whatever power level you want to promote them as but your street use Denzels really need to comply with the 5-brake hoursepower limit.
I 100% agree that neither street or off-road models with that level of performance should be lumped in with LSEBs or motorcycles. I think you'll find that most states do have some tolerable regulation of sub 5-bhp motor-drive cycles.
Fairly recent legal "opinion" article on this subject:
https://www.retailconsumerproductsl...sdiction-over-certain-micromobility-products/
Be cautious because some on this tread will claim that these "motor-drive cycles" will end up denying them trail riding prevledges ... they think anything you can get on besides a class 1 ebike will somehow deny them their trail riding. They are pretty nutty that way.