Re: 70 hp evinrude loses power after 2k rppm
Salty.... I understand that you are saying that the engine goes into gear okay, and that it takes full throttle with no problem, then after approximately ten (10) minutes, it stalls out. <br /><br />That would indicate either overheating or a fuel restriction. Since you say nothing about overheating, that leaves the restriction. If you're using a built in tank, the following may apply. Note that the following covers various engines.<br /><br />(Fuel Anti Siphon Valve)<br /><br />Many of the later OMC V/6 engines incorporate a fuel restriction warning via a vaccum device attached to the powerhead. If the engine overheats, or if you have a fuel restriction, the warning is the same.... a steady constant beep.<br /> <br />NOTE... Only the V/6 & V/8 engines have the above "Fuel Restriction Warning". The warning horn will not sound on the other models. <br /><br />The fact that a engine is not overheating, but the warning horn sounds off (V/6-V/8) with a constant steady beep, and that the rpms drop drastically would indicate that the engine is starving for fuel due to a fuel restriction. <br /><br />Check the built in fuel tank where the rubber fuel line attaches to the tank fitting. That fitting is in all probability a "Anti Siphon" valve which is notorious for sticking in a semi closed position. It will be aluminum, about 2" long, and the insides of it will consist of a spring, a ball, and a ball seat. If this valve exists, remove it, knock out those inner components which will convert it to a straight through fitting, then re-install it. Hopefully that cures the problem.
