engine????

A buddy gave me an old powerwasher with a Tecumseh 5hp Enduro motor on it. Its got good compression and I see no reason why it wouldn't run with a little TLC. I was worried that it had a tapered crankshaft and after removing the pump I found its a straight 3/4 inch shaft. Is this thing worth...

The boys each got a DB30, in addition to the one I got myself. One DB is running strong, and the other is a pig. Would dropping in the HF 2.5 HP engine be an upgrade, or should I look for a used 5hp Briggs to shoehorn in there? Thanks!