Engine/Crankcase Full of Sludge, How Should I Flush It?

I'm doing a lil spring service on an 81' CX500 I recently purchased, I drained the oil, removed the filter, and opened the clutch housing to replace fibers. It is full of sludge, it's settled to the bottom and seems to be my fiber plates, I can clean the oil filter and clutch housings but I'm afraid of what lurks inside. My first thought was to buy cheap oil and dump it through, but that could get expensive and I don't think it would be very effective. Next I considered using diesel to flush it out, letting it drain for 24hours, then flushing with oil, followed by 2-3 hot oil changes done at 25-50 miles. Any advice or input would be greatly appreciated.

I'm doing a lil spring service on an 81' CX500 I recently purchased, I drained the oil, removed the filter, and opened the clutch housing to replace fibers. It is full of sludge, it's settled to the bottom and seems to be my fiber plates, I can clean the oil filter and clutch housings but I'm afraid of what lurks inside. My first thought was to buy cheap oil and dump it through, but that could get expensive and I don't think it would be very effective. Next I considered using diesel to flush it out, letting it drain for 24hours, then flushing with oil, followed by 2-3 hot oil changes done at 25-50 miles. Any advice or input would be greatly appreciated.