A couple of days ago I got an email totally out of the blue from a Belgian chap who has a Kubota KND3 which he has built into a garden tractor. He must have been looking at the NG archives as he offered a solution to my starting problems. His tractor installation includes six metres of heater wire (of the type normally used for frost protection on water pipes) wrapped around the head and fuel pipe. Warming the engine with this for ten or fifteen minutes apparently makes all the difference even in summer. Perhaps I should try a kettle full of hot water in the hopper
He also sent me the following link:-