Hello,<br />I have a problem with my 1984 90 HP Johnson. It starts and idles well, but the last few times I've had it out I can't get it above 3,500 rpm and it is only going 25-30 mph on a Starcraft 16'. It used to hit 45 mph and have lots of power. I cleaned both carbs recently (no hint of any dirt, etc.), I verified a spark on all 4 cylinders (at idle), I just installed 4 new original spec champion spark plugs and I have done a compression check with 118 - 125 psi on all cylinders. The engine will gradually slow, sputter, then regain some power but I would say it is never running above 1/2 the power it should have. I inspected the fuel filter and it looked clean (I know I should replace it anyway). All spark plugs look the same after running - some blackening on the side electrode and clean center electrode with one side of the ceramic all clean. I am running 50:1 premix - the VRO oil pump is inoperative but I have never properly disconnected it - I am looking at doing this but I don't think it's my problem since I have had full power in the past with the same setup. One observation is that the fuel squeeze bulb is not hard (but not collapsed) while engine is running WOT. I took off a fuel line to the carb and manually sqeezed the bulb - lots of flow with no restriction. Sorry for the long story, but I thought the details may be useful. Thanks in advance - great forum.<br /><br />Kenpars
