myford wont start in forward

was working fine but suddenly now it wont start in forward but runs fine in reverse,forward makes a buzzing then cuts out,can anyone help?

Assuming you are using a Dewhurst Drum switch ? If so it may be the switch contacts particularly if you are using it as the start/stop/reverse.
Alternatively its the starter windings in the motor - centrifugal switch that sticking
Please keep in mind I am NOT an electrician and have limited knowledge in electrickery !!!