Firstly I would like to discorage anybody from buying an Emax. Below is the most serious of my problems but there have constantly been others right from new.
I have an Emax 110S nearly 3 years old, 7000 miles on the clock.
a year ago it developed a problem where it accelerates at full power without touching the twist control. it does it when the steering column is moved slightly side to side.
(E.g. I brake to slow down for traffic lights and it suddenly accelerates toward the stationary car in front!)
another problem at the same time is that travelling at 28mph on the limiter it periodically loses power and speeds up and slows down.
also the battery performance went down rapidly until a few weeks later my range was down to 13 miles.
The problem is worse in wet weather.
My dealer did 'something' which seemed to resolve the accelerating and slowing problem, but I think by that time the batteries were on their way out.
I have replaced the 62 AH batteries with 75AH ones. the originals gave me a range of at least 50 miles when new.
My new batteries only give me about 30 miles (<25 in wet weather) and the accelerating problem has started again worse than ever (i have sometimes had to hold it still on the brake against the motor on full power to avoid hitting the car in front).
Has anybody come across problems like this? If so what is the solution?