washing machine wont spin?

hi,i have a simson enduro 725 automatic washing machine my problem is when the spin cycle is activated the motor tries to start ,then stops,then starts [continuously]. this is with no load [clothes or water].the same motor also washes [forward,reverse] with no problems.capacitor checks out ok.is it single wound motor doing both spin and wash[i have no diagram].are we looking at wash setting controller,orforward/reverse electronic control module or none of these.am an electrician but automatic washers are not my strong point can someone please assist thank you