I have a Yamaha Jog which I bought new in 2008. In recent weeks it has lost power and will not travel at more than 20 mph. It has been checked by an experienced independent mechanic who cannot diagnose the problem. Any suggestions would be welcomed. 
We invite you to introduce yourself by a few sentences if you are new to
this discussion group. Enter your e-mail to join the forum and get notifcations on new messages. Or post your question,
answer or comment as a guest. We have just improved this discussion forum and expect the number of users to increase.