stingerbassboat
Member
Good morning guys, I'm back with my 1977 140 hp evinrude problem. Here's everything I have done or had done to this engine. It starts, idles a little rough but the motor always has. The problem now is the motor sounds great at full throttle, only problem is, not enough power to get the boat up on plane. I have to stand on the front of the boat while my brother drives to get it to get up on plane after a couple 1,000 yards it finally will get up on plane. Engine sounds great, no mis fires or even sounds like it's struggling to run, just doesn't have enough power. Here's what all that has been done and I'm just at the end of my rope with the motor. I have owned the boat for 12 years now and not one single problem until this problem. New fuel pump, tried a new electric fuel pump, all lines from tank to carb replaced, new bubble, bypassed the fuel connector at the motor, new plugs (2 times), New timing base plate, new stator, new crank seals, all 4 new coils, new power pack, compression on all cylinders between 105 and 112 psi, I have gone thru the entire wire harness from control box to motor, no broken, bare or loose wires, visually checked all wires on the motor, cleaned connections at block and power pack, all linkages has been checked several times. When throttle from control box is wide open, carb butterflies are wide open and sitting on the pin stop as far as it can go. The motor states to set the timing at 28 degress, I've tried that but I was told by a local marine mechanic to set it at 20 degress, which it does run better at 20 degress. I bought a new CDI timing base plate which looks nothing like my old one but the mechanic confirmed it is the right one for my motor. For some reason tho, it runs better with my old one but I've switched them back and forth everytime I replace something else on the motor. If the cover is off the motor, it will die when trying to apply the throttle, I assume, it sucking too much air with it off. I've been convinced all along it's simply not getting enough fuel, O yes, carbs rebuilt by a local marine shop but checked and cleaned 2 times before I just had them rebuilt. He said he found a little grit inside but nothing else wrong with the carbs. I am at my end with this motor but feel I'm so close to getting it right. It runs fantastic at full throttle just no where near the power this engine used to have. Please, any help would be much appreciated, I've spent well over $1,500 on this engine, not including labor cost. The problems before were not the same as now. All this started because I ran the boat for maybe a 1/4 mile wide open and it just shut off like you had turned the switch off. No longer doing that but has no power......Danny