ok heres what i did...first i drained ALL the fuel out of the tank, then i put about 1/4 of the seafoam can into the gas tank, put in about 1 gal of gas back into the tank, close the cap shake the tank a little to mix it up good, then i took off the air filter added a small amount maybe 2-3 cap fulls, then put the filter back on dont screw all the way back down you will need to add more in a few, start engine with FULL choke on, let it warm up then use a funnel or something to add more seafoam into the intake, and make sure to get ready to rev the engine some to keep engine going, DO NOT let it die!!! your exhaust should be smoking really good by now, then after about 5-7 mins, shut off engine to let the sea foam soak into all the carbon and crap, let it sit maybe 10-15 mins depending how dirty ur exhaust and engine is, then start it back up let it warm back up and let it idle for about 15 mins, then shut it off, let it sit again and so on, and you should notice a difference, my exhaust isnt really clean but alot of the carbon is gone, and rides so much smoother, i might take off the exhaust and take a circle wire brush to clean the rest..hope this helps....oh cant stress this enough!!! DO THIS PROCEDURE OUTSIDE!!!!!! you will get ALOT of smoke while doing this, my engine temps stayed stable during this, so go at it..lol