…Why the fuck would I need a chain on my lawnmower? AFAIK, push mowers are all direct drive for the blades, and riding lawn tractors use belts.
Carburetor, not ‘carborator’. And it’s mostly the most polluting engines–lawnmowers, chainsaws, etc.–that are still using carburetors. Every thing else that uses gasoline has switched to fuel injection.
And last, DO NOT LET ANYONE OTHER THAN A PROFESSIONAL CHANGE THE SPRING IN YOUR GARAGE DOOR.
I honestly haven’t seen one in >30 years with a chain. Admittedly, I haven’t been looking too hard.