I converted a Carrera Vengeance about 4 years ago with a Cyclotricity Front Hub 250W 36v and a 15Ah battery which has been a great bike for me. I`ve done about 4500 miles on it and the battery and motor is still good but the forks ect are starting to fail so I bought a Carrera Vulcan, what a disappointment, its like going back to a manual bike again, I could get used to the not having 18.5mph and not having a throttle but it couldn`t pull my socks off. No matter what setting I have it in the motor seems to pulse on and off, and the assist level indicator keeps jumping from zero to about 3/4 when I`m pedalling, is this normal on the Vulcan or have I bought a duffer.