The plug can't really carbon up in seconds. Change the oil first. If the plug fouls up with oil quickly you have a broken oil ring on the piston. If the plug fouls with gas, there's a problem with he carburetor.
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fix the reason for the carbon in the first place
it is excessive fuel or oil consumption
as to cleaning carbon off the valves , there are very few products that will do that
you can ask specialist engineering shops for products that may work but the real fix is to pull the head and clean the valves and fix the reason the caused the problem
EGR valve or It may be a spark issue, like a dead plug or bad wire. Give it a tuneup and see if that helps. Idle air control valve could be faulty. Excessive buildup of carbon around the throttle plate will cause it. 75% sure its carbon/dirty throttle blade.
Is the porcelain "cracking" or are they getting "carbon-tracked"? (see example photo of carbon-tracked plug below). It is common for carbon-tracking to occur if your original plugs were carbon-tracked and you replace the plugs without replacing the wires. If the plug is carbon-tracked, the boots on the wires or the coil boots (coil-on-plug ignition) are also carbon-tracked. If you do not replace the wires or the coil boots, the ignition will still misfire by following the carbon-track on the inside of the boot. This will cause your new plugs to also be carbon-tracked within a short period of time (days or weeks).
There is no reason I can think of for the porcelain itself to actually crack other than faulty installation techniques or possibly, cold liquids getting poured on extremely hot plugs.
Check and see if the muffler and/or exhaust port is plugged with carbon. Many 2 cycle mufflers use a small metal screen called a spark arrester that can get plugged by carbon and will not allow the engine to rev up. A small hand held torch works best for burning the carbon off of the screen and from the insides of the muffler. Hold the screen with a pair of pliers while heating it up. Same thing with the muffler. Carefully tap the muffler after you have burned off any excess carbon to remove any large pieces still inside. You can carefully use a small flat blade screwdriver to scrape out any carbon from the exhaust post (opening) in the engines cylinder.
Carbon build up comes from rich mixture or weak ignition. This will cause misfiring, hesitation and hard starting. To fix the problem, change the plugs and use a plug that will produce a higher heat range. Which means it has a hotter firing/ignition when combustion. This will burn the excess gas that causes the carbon. Be sure to check the plug wires to make sure you don't have spark jumping. (check at night with engine running). Also be sure the air filter is clean.
FOR ENGINE THAT DIESELING POSSIBLE CAUSES IDLE SPEED TOO HIGH.IGNITION TIMING OFF AND EXCESSIVE CARBON DEPOSITS ON VALVES AND PISTONS.YOU CAN GO TO AUTO ZONE BUY A CAN OF ENGINE CARBON REMOVER YOU ADD TO GAS BUT IF CARBON BUILT TOO THICK ON VALVES HEADS AND PISTONS.THE CYLINDER HEADS WILL HAVE TO BE REMOVED.TO CLEAN OFF CARBON.
Assuming the engine timing is'nt the problem; you may have a fouled spark plug, bad spark plug wire, or excessive carbon build-up on the valves and pistons etc. Make sure all fluid levels are where they should be. Try replacing the spark plugs and wires. Look in your operator's manual in the specs sections and make sure the spark plugs that are installed are gapped properly. Improperly gapped spark plugs or split-fire ( can't be gapped) spark plugs are known to cause engine issues. Make sure to use dielectric grease when connecting the spark plug boots to the spark plugs; and the wires to the distributor. Also run a couple bottles of fuel system or injector cleaner and water remover through several tanks of gas to remove any possible excessive carbon build-up. Hope this helps. God bless!