Allow enough room in the price to have it repaired without going over the new price. Know the brand of the engine. My price is about 50% of new. Anything higher and I will buy new. I have one gas engine that is pushing 20 years and have only had it worked on twice. It has reached the point where I will have trouble getting parts in the future so the next time I'll have to buy a new one. I guess one new engine every 20years isn't that bad. Dennis