Sorry thought it was petrol, its going to be a motor issue, unless this is a newish machine it will not be worth replacing the motor, motors range from £30 to £60 it may be time to invest in a new machine, if you take the pnc ( product ) no. from the rating plate, ring Flymo, they have a credit card line, they should be able to give you the price of a new motor
Husqvarna man, May 2010