Originally Posted by Ibedayank
can pick up the 49cc hs with a 4g trans under $400
31cc friction drive kit for $190 plus shipping
can buy gas anywhere now charging a battery on the other hand....
The OP question wasnt whether electric or petrol kits were cheaper. It was which engine was more energy efficient/environmentally friendly.
GusPdx Im not sure which is more efficient. Electricity isnt 100% clean because you did mention they burn coal to make electricity. That may be true, i dont know where you source your power from, but over here in Australia we can choose cleaner energy options.
Alternative energy sources can include solar, hydro, wind, geothermal, nuclear etc. We can switch electrical energy sources with no impact or changes needed to an electric bike.