[cobra427mnsi]

I use it in everything to decarbon the cylinders. When I put the cobra away for the winter, I pour SeaFoam down the carb until the motor stalls (engine smokes like a bugger). In the spring when I start it, it will smoke for a few minutes until it warms up. I haven't pulled a head off to see if it removes carbon build up or not but the plugs seem clean.
I ran some of it through my 2 stroke weed wacker (it was running rough). So much carbon came out that it plugged up the spark arrester. After I cleaned the spark arrester out, the weed wacker ran like new.
I also use Seafoam in my 2 stroke 250hp Yamaha outboard motor. I add it to the gas tank. Keeps the spark plugs running clean.