Being the only wrench turner in the fiance's family, it fell to me to take care of her father's push lawn mower. (to be fair, he is an engineer that could solve any problem, but his health is poor and he can't do much of anything anymore.) The problem was the mower would not start. It worked two weeks ago, but would not start now. It was a Sears mower with a Briggs and Stratton engine on it. It has electric start. Fiance's son mows the lawn, but the mower would not start.
I first took the spark plug off and wire brushed it. It hadn't been changed or brushed in a couple of years. I next took the air filter off and tried to clean it. I put starter fluid in the plug hole and nothing happened. I would pull the recoil, not even a pop. I smelled the gas. It did not smell right. One of my fiance's sister's went and got fresh gas. I drained the old gas out in the mean time. When she returned, I put in the fresh gas. After 5 minutes of continued pulling, a pop would happen. About a dozen more pulls finally got it running. I taped the safety bar to the handle and let it run for 5 or 6 minutes. I pulled the recoil and it would start. I let it get cold, while I looked at the electric start button. It was not there. I fashioned a new button out of junk. It worked. The mower would not start. It was now cold and would not start.
I let it go for the night as it was hot and late. Fast forward 5 days later. My fiance's father had purchased some new parts. The air filter and the spark plug matched up. Before I installed them, I gave an obligatory pull on the recoil. To my surprise, it roared to life.
When I left it 5 days prior, I felt it had carb issues from bad gas. I added the appropriate amount of Sta-bil to the gas can and a small amount of Lucas Injector cleaner. I also put some Sta-bil and the Lucas into the lawn mower tank. It never started that night, even after starter fluid.
What do you think happened. Did the Lucas Injector cleaner clean the carb?