I always use seafoam on stored vehicles, boats, tractors, yard equipment, cycles, and snowmobiles. I always run a heavy dose at the beginning of the season and have never had a carb gunk up. The jets are only part of what needs to keep clean. The passages between the jet and the carb throat are very tiny especially in the idle circuit. The jet is just a meter for the idle and main circuit. The circuit passages are often what gets plugged and not checked when rebuilding. These can easily plug. The best way to be certain is blow compressed air in the jet and make sure air gets through to the carb throat. Most old non running equipment I have bought I usually takes a dose of seafoam in the gas it I can get it to run and most but not all the time it will clear the jets and passages. If not it gets a teardown, soak, and compressed air to check/clear the passages. The worst case I had was a Suzuki dirt bike that had a piece of jet stuck in the idle passage. I had to use a thin wire to get that out and it was way in there. Good reason not to get too aggressive with tools and jets. Anyway, Seafoam has been used for years, and no I don't work for them, but it's worked for me and never yet let me down. At the end of the season put a few ounces per gallon in the fuel and run it into the carb and if you should be fine.