Originally posted by KyleSch
You should not open up the engine to remove dirt since there won't be any dirt to get out of there if you have taken care of it. If there is dirt in there your engines trashed anyway 
If you wanna clean out the grease and stuff WD-40 works very well, take off the glow plug and header you spray (alot) WD-40 in the engine with the piston above the exaust opening. Let it sit for 10-15 minutes. Pull the pull starter while the engine is upside down, it gets rid of most of the grease and oil left from the fuel.
I really didn't take the engine apart to get the dirt out of it....I just took the heatsync off the top of the engine to get the crud and grease out of the heatsync where the glowplug goes....I can clean out the fins without removing it, but I just wanted to get toward the bottom where the glowplug sits so stuff wouldn't get into the engine....Not only that, but I could spray the WD-40 on the heatsync to get that cleaned up without fear of the WD-40 going into the engine and taking the dirt with it!