40mm bore x 38mm stroke = 48cm, 1.6HP@5,000rpm
45mm bore x 40mm stroke= 60cm, 2HP@ 5,000 rpm
47mm bore x 40mm stroke= 80cm, 3 HP@ 5,000 rpm
Manual state 500Km for 16:1 break-in oil to fuel ratio (instruction manual states 200Km. I believe the life of the motor depends on oil quality and mild rpms at 15 mph with stock gearing.
These motors are sold by Powerking on ebay or also known by nickname of happy times or HT.
