Fuel system cleaner for a kart?

[Raizor3203]

So you can buy fuel system cleaners and injector cleaners for a car. I was wondering if I can just use some that you use in a car on my Tecumseh. I bought injector cleaner before for my car that lubricates the valves and springs too, so I figured my old engine could use a good clean internally.

Do you guys know if this'll work or of another way I could do this? I don't have a large set of tools to work with so I don't think I can do any tear-downs or rebuilds and clean while I'm in there.

 

[r_chez_08]

I have heard of something called seafoam which removes all of the coke and crap inside your engine. Makes it smoke like hell then it runs better.