I have been a professional Auto tech of 20 years and I never believed in anything other than Top engine cleaner for cars.
We use that stuff through a pressurized machine to clean fuel injectors. Directly shot into the engine with a tool, will bake the carbon off the tops of pistons and valves.
We used to have 4.3 Vortec V-6's get sticking valves and cause a miss at idle from carbon buildup on the valve stems. We would run top engine cleaner through the pcv hose at high idle then stall the engine with it and let it sit for 20 minutes.
When we fired them up, we took them on the highway and flogged the crap out of them, and literally looked like a James Bond Smoke screen from the tailpipe and the miss was gone.
That stuff works.
But for small engines and bikes, Seafoam does work well. I have run it in ATC 70's that blowed the blues from gummed up rings and they stoped smoking after a while. I have run it in carbed street bikes and felt a difference in performance. I like to use stabil for storage, but only for 3-4 months max in a 2 stroke. I use it in my summer lawn equipment, store it all winter and they fire right up the next year.
Anything else I dont use.. Seafoam and stabil for small engines with carbs. Neither of these will not fix a badly gummed carb, but used every now and then prevents needless carb cleaning and oil gumming and varnish.
Top engine cleaner for Cars only. It is to volatile for a small engine.
Here is where my long useless list of stuff nobody cares about should go...
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