A friend of mine recommended StarTron to me after he retired to FL and took a job at West Marine. I've used it for at least 15 years now.
I have two 1968 Cub Cadet 125's. One is set up for grass duty and the other for snow duty. One is parked in front of the other depending on the season. late fall and early spring is "switching time".
Today they swapped spots. I started the grass 125 and pulled it out. I turned on the gas for the snow 125, unplugged the battery tender jr ( they both are on year round) and it fired right off
It's been that way for years, never a problem with that crap they call gas now since every single gas can has StarTron in it.
Jeff