This is how I've been performing my own engine oil flushes - http://www.mightyram50.net/vbulletin...ll=1#post49592

Yes, you will waste some fresh oil in the process but it will carry a large amount of contaminants out of the engine. Had plenty of positive feedback from members using this method. It especially helps with noisy hydraulic heads and may even restore some compression if the piston rings are gummed up.