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Message: [QUOTE="whenfoxforks-ruled, post: 1359357, member: 73147"] You tell me, does the 2 hoses come off the pump and feed the head/cylinder, or seemingly pumps through the cases, and up through the cylinder. Look in the book for the normal operating pressure, or the cap, and pressurize the system with air? If it feeds into the cases take your pick, center case joint, base gasket, or a cracked cylinder/head or case. A leak above the compression would be the only one that produces lots of bubbles, I figure. Are you loosing a lot of fluid? A black plug can be from retarded timing, or incredibly rich jetting, low compression, bad right crank seal, or its been ported and polished? [/QUOTE]