I just changed my belts, along with the help from my uncle who has all the manuals and tools. The auto tentioner is actually a spring loaded piston that maintains constant pressure on the tensioner pully. When you change the belt, this pistion pops out all the way. You need to fill it with oil, turn the screw to pull the piston back in, and put it back in to the engine with a special tool to hold the piston in untill it's latched to the tensioner pulley. Other wise it pops back out. Now, I looked at every part which could cause this grrrr problem, and couldn't find it. Mabe it's one of the tension pulleys (there's two of them).

(Helps to have someone in the know..... I changed my belts, spark plugs, brake pads, turned rotors, and valve adjustment all for 500.00 with genuine Honda parts except Wagner brake pads. And I learned alot about this engine)