Reddit reviews Bicycle Motor Works - The Fire Fly Motorized Bike Kit
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Complete Motorized Bike Kit 2-stroke engine
Bicycle Motor Works - The Fire Fly Motorized Bike Kit https://www.amazon.com/dp/B01GIT43N6/ref=cm_sw_r_cp_apa_i_eEzWCb3059GQW
Conversion kits are cheap and they are pretty popular in the US. Also for scooters. It's so your genz child does not have to peddle like a sucker.
But I believe they would have range issues. Not sure if running the motor for hours is its design.