I see that Rolla16V interpreted those numbers for you already, so you have the information. Spray degreaser can be used for cleaning your engine, but you will still need to use a paintbrush to shift the dried out oily sludge. You can use kerosene instead of degreaser - it is nearly as effective, and a lot cheaper. Once all the dirt is loosened up most people use something like a hose or a pressure washer to blast the oily residue off. Be careful not to spray the air cleaner though, or water might get into the engine.
The stuff that comes off the engine will make a filthy mess on the ground, so put a suitable drum or tray around the engine, and empty the mess into a container afterwards. Dispose of the container (usually an old oil container) properly.
When you have the engine clean, you will need to put the cooling cowl back on to do a rudimentary compression test. All you do is pull the starter a few times (with the "stop" control resting against the spark plug, so the engine can't start) to get the feel of the pressure generated in the engine as the piston comes up on the compression stroke. When you are used to how it feels, you remove the spark plug and put just one spoonful of engine oil into the cylinder through the spark plug hole, then put the spark plug back in. Immediately pull the starter a few more times and feel whether the compression pressure has increased (that is, it has become harder to pull the starter when the piston comes up on the compression stroke). If there is more compression with the oil in there, the engine will need an overhaul, including new piston rings.
