I just picked up my new to me Phoenix 618 with 175 Optimax Pro XS 2 stroke. I have no idea what the service history is other than the engine had 299 hours on it when I picked it up. I took the cowl off and everything looked good visually. There were numbers written in paint pen in a few spots, not really sure what they are but might be compression and injector pressures. The engine is a little slow to start compared to the 115 Pro XS 4 stroke I had. It it also stumbles a bit when coming out of the hole. Idle seems fine and it runs strong. The place where I bought it does an "operational check out" to make sure everything works and is "with in specs" per the service guy. He didn't say the did the 300 hour service so I take it that they didn't. I think I'm going to go ahead and do the things that would need to be done at 300 hours to make me feel better. I've looked at the manuals that came with the boat/motor. I'm guessing spark plugs, water pump, fuel water seperator to start. I'm guessing there are several filters for fuel and such that need to be changed as well...any idea what/where they are? What else needs to be done? I kinda got spoiled with the 4 strokes, they are easy to maintain! I'm still looking around for an actual service manual but haven't found one yet. Thanks in advance for any advice!