I must say all this is confusing. I first went to
http://forums.sohc4.net/index.php?topic=264.0 and the recommendation is as below shown. Based on this, I used Specto 10w-40. Tools has suggested Havoline 10w-40 which is a synthetic oil?
"10-40w MINERAL oil is what Honda recommends. When these bikes were first sold, the API oil rating and formulation level was SD or SE. 20W-50 MINERAL oil can be used on older, worn motors. Don’t use synthetics. Synthetics have a reputation for a high detergent action. That is, if you have an old engine that has some sludge or deposits internally, the synthetic will sometimes remove it in chunks. There is some risk of plugging or restricting the oil pickup screen, which would starve the engine of oil. It also affects some old seals adversely causing them to leak (from shrinkage if I remember correctly) and often leads to clutch slippage (see Clutch FAQ for clutch slippage comments)"
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