I'm suspicious of an ignition problem with my 115hp 78 Merc. What are some tell-tale signs that I'm not firing on all cylinders? When I adjust mixture on all three carbs I get noticable results. After a day on the lake I pull the plugs and they all look the same. Motor starts and runs fine but is just a little slow for a 16ft Glastron with just me and a cooler. You all have helped me so much before, so thanks in advance. Here some other facts:<br />WOT is 5500rpm, planes and gets out of hole fine.<br />Prop is 19 pitch aluminum, slightly dented.<br />Motor sits in water at the correct level from what I've read.<br />I decarb often.<br />Compression, if I remember correctly, was even on all 6 last year at 90psi. I did it cold, please inform me of the correct procedure.<br />Bottom of boat is smooth and clean.<br />No hydrofoils.<br />Have been through the whole range of manual trim settings.<br />16ft Glastron, top speed only 35mph on gps.
