How Much Should I Sell My Used Lawn Mower For . How much is my tractor worth. Your best money making option is to sell directly to a buyer. Topic Ransomes Motor Triple MK4 mower drive Vintage Horticultural from www.vhgmc.co.uk The blades of a riding mower should stop running if you stand on them or otherwise remove your weight from the seat. Depending on where you list it, what the market demand is right now and other factors you may sell your mower in 3 hours, 3 days, 3 months or 3 years. Determine the market value of your lawn mower.