My DL-50 idles great and high end is smooth at full throttle. Fully broke in. It gurgles badly at above mid range and the plug is oily and has carbon on top the piston. The engine runs fine and has not stopped running because of fouling. It is pretty hard to start when hot. I figure the plug is fouling at starting. I am using Bel-Ray mc-1 full syn. at 50:1 ratio. I replaced the stock plug with the NGK-cm-6 but it got oily too so i put the stock plug back in after cleaning. Could someone give me a simple way to lean this thing out? Repeat. Please keep it simple. I don`t want to screw it up and ruin the engine too lean. Thanks guys.