Petrol hover mower (Fiveways BN1)

Allen Hovertrim 446 petrol mower with Honda GCV135 four-stroke engine, 18" width cut. Fitted with metal cutting blade but originally came with nylon blade for safety. Only been used once in last 18 months as now too heavy (17.6 kg) for me to carry up steep garden but previously well used over several years. Old fuel been siphoned out so I haven't tested whether still working. Certainly needs a good clean, particularly underneath and blade not very sharp. Was a good and robust mower including on bumpy, sloping ground.