Evinrude 70hp Outboard

[eddycan]

Hi Gents<br /><br />Recently i purchased a boat with the above motor,the motor runs fine but when i accelerate it seems to take a while for the revs to go up then next thing you know its revving to high,do i need throttle adjusted or could it be something else any information will be really appreciated.<br /><br />Eddy

 

[dkondelik]

Re: Evinrude 70hp Outboard

Do you know the historyof this motor?<br /><br />From here, I would guess that your problem is in the fuel delivery system (tank,lines, pump, carb). Sounds like it might be running lean.<br /><br />Good Luck<br />HAVE FUN!

 

[JB]

Re: Evinrude 70hp Outboard

Hmmm.<br /><br />Could be a lot of things, Eddy, but I think your engine is okay.<br /><br />Wrong prop? Could it be cavitating?<br /><br />Wrong rig? Is the engine too high on the transom or too short for the transom. That would cause it to ventilate the prop.<br /><br />Wrong trim? If the engine is trimmed out too far it would be hard to get on plane, then ventilate the prop.<br /><br />Spun hub? If your prop hub is loose it might start to slip only after the engine gets high on it's torque curve.<br /><br />Since you just bought the boat, I think it is most likely a wrong shaft length or wrong rigging.<br /><br />The anti-ventilation plate should be level with the bottom of the boat, the shaft should be perpendicular to boat bottom at neutral trim.<br /><br />The prop should allow the engine to reach, but not exceed the top of the operating rpm range with a light load.<br /><br />Good luck.