So I'm fairly new to riding lawn mowers and bought my first one for $100 last spring, it was a 1986 Craftsman LT12/38 with a bag and the only thing it needed was a tire and battery. It served me well all year until the start of fall. It had a very tough time starting the last 3 times and started smoking pretty bad. I did change the oil before I used it and used fresh gas too. I'm not sure if the engine is just getting tired or it needs a tune up. (I've had bad luck with tecumseh engines in the past). Anybody experience the same or have an idea?