what is the cheapest street legal motorcycle available under 5 horsepower?
Not a motorcycle, but as close as you can get under 5hp: a moped. I see they no longer require pedals. Section 259:57 259:57 Moped. – Moped'' shall mean a motor-driven cycle whose speed attainable in one mile is 30 miles per hour or less which is equipped with a motor that produces 2 brake horse power or less; if an internal combustion engine is used, the piston displacement shall not exceed 50 cubic centimeters and the power-drive system shall not require the operator to shift gears. Source. RSA 259:1, XIII-a. 1976, 4:4. 1977, 272:1. 1981, 146:1. 1983, 147:1, eff. Aug. 6, 1983.
