Mantis Tiller with lots of accessories - not working (Scunthorpe DN15)

I bought this tiller in 2003; it has been very useful for de-thatching the grass, tilling the soil, edgeing the grass, and weeding in the brick paving. All of those accessories are included. I bought a new carburettor last year and new air filter: but i haven't been able to get it working properly. It fires up for 5 seconds and then dies. I am too old and disabled now to use it. I could sell it for parts on e bay (the de-thatcher accessory goes for just under £100) but i would prefer it goes to some one who would like to tinker with it and get it going properly again!