Finnaly decided to join this forum after it has helped me out quite a bit with a 1985 bayliner capri i bought a few weeks ago. The boat has a aq125a with a 270 outdrive on it and so far after purchasing it we had a problem with it overheating and that was solved by cleaning out the cooling system and changing the impeller. I also put a new timing belt on it a few days ago. The problem im having is when you run the engine at 3500 rpms and below it will run fine for hours! but as soon as you step it up a bit to about 4500 rpms (almost wot) it will last for about 15 seconds and then suddenly lose power and sound like it is running out of gas, so i pulled the carb off yesterday and cleaned it all out completely and were still having the problem. When the egine starts to lose power it backfired once yesterday and i can hear a strange sound that sorta sounds like a loose bolt in the engine (valve chatter)? So ive deided to adjust the valves which i will take care of tomorrow! Any ideas on what could be cuasing this? and any tips on doing the valves will be appreciated too! Also i should add if you return the engine to idle for 30 seconds or so it will go right back up to WOT but to have the same problem just happen again.
