Performed a decarb on my 2005 Mercury 25 hp 2 stroke that was hesitating during acceleration. Warmed up the engine and sprayed the Seafoam Creep into the intake and shut it off for a 15 minute soak. Ran the engine for 8 to 10 minutes and then repeated the soak and run a second time. The carbon that came out in my run barrel was quite shocking. Put new plugs in and took it fishing a couple days later. Fired up easily which is normal, but it accelerated perfectly and I gained 2 mph per GPS. Wow! It does smoke heavily for a few minutes as it's burning off loose carbon. I'm going to start decarbing twice a year. Might be worth a try if your performance has fallen off over the years.

I use regular Seafoam in my boats, ATVs and lawn tractors. I swear by the stuff for regular maintenance.