Re: Is this bad to do
What djohns19 said.<br /><br />If not, fouled plugs are the least of your worries. Carbon build up, then stuck rings, then lowered compression, then poorer burning and more carbon buildup, then harder starting, then a broken ring, scored cylinder wall, damaged piston, rebuild. Do the decarb.<br /><br /> Decarbing is a 2 part process. One preventative, done by using a fuel additive to prevent carbon build up. SeaFoam is such a fuel additive and can be found at most auto parts stores. It works as a fuel system cleaner and should be used as a preventative maintenance procedure.<br /><br />If your intent is REMOVE the existing carbon buildup from the cylinders, heads, and rings, then a spray decarb solvent product is needed. Buy at least 2 cans of decarb. Some people use one can per cylinder.<br /><br />Run engine at fast idle, with engine running<br />spray liberal amount into each carb,<br />spray some more, spray a larger amount into carbs until engine chokes out and stops,<br />remove spark plugs and spray decarb liberally into each cylinder, install the spark plugs, let it soak for 1 to 12 hours. <br />Start the engine and run at medium throttle, or if at the lake, run it at full throttle. It won't hurt to spray some more through the carbs. Run it for atleast 10 minutes to flush the crud out of your engine. Now remove and clean or replace the spark plugs.<br /><br />If you do this on muffs, don't do it on the driveway or up against the garage/house. The crud blown out of the engine will make a mess.
