I am in the process of purchasing a GW 2001 Marlin 300 ( http://forums.iboats.com/boat-topics-questions-not-engine-topics/thinking-trading-bigger-boat-590387.html ). I have a boat survey scheduled for next Thursday. The boat has the original 0x66 Yamaha 2 stroke 225HP engines, but there is no hour meter available. The dealer says it was a one owner boat and he only went from A to Beach and back to A , blah blah... and the compression is excellent. I talked to the surveyor, and he said he is not sure that he can hook up his computer to give the true hour reading of the engines. I am not an engine expert or even novice... Is compression testing a good enough test to tell me that these engines are not going to need a 20k overhaul the minute I put them in the water, or should I be looking/asking for additional tests???