I would not pour a whole bottle of anything in it. I would add some Techron Complete Fuel System Cleaner to the tank. Go 2X the rate. I would also run non-ethanol fuel 100% of the time. I have used for a couple of decades a 50:50 mix of Startron & Marine Stabil in all my small engines and 2 -strokes. Depending on the mileage, you may also need to change your plug and adjust your valves. Shine a flashlight down into your fuel tank. Any foreign stuff in there? Good luck.