1994 150hp evinrude oil pump?

[bfast1fishing]

My 1994 150hp evinrude smokes really bad at start up. The problem seems to be fine at cruising speed and not near as bad after it warms up. But at start up, it's embarrassing to say the least, plus the plugs foul out allot sooner than normal. The outboard is carberated, and I suspect the problem could be either in the meatering ao in the pump. Any help would be greatly apperciated. Bfast

 

[Chris1956]

Re: 1994 150hp evinrude oil pump?

Bfast, When you startup, there is extra oil in the carbs, due to evaporation of the gas from the last trip. So smoke on startup is pretty normal.

Now extra smoke during operation can be caused by an air leak in the gasoline lines. The OMS pump will suck extra oil to compensate for the ait leaking into the gas line. Check the system from the fuel filter on the motor back to the tank.

 

[tashasdaddy]

Re: 1994 150hp evinrude oil pump?

also decarbing the motor, getting the crud out of it. will decrease the smoke.

Decarb, take a can of seafoam put 3/4 of it in the gas tank, with only 1 gallon of premixed gas. put the rest in a spray bottle. start the engine, and let it come up to temperature. then remove plugs, and them some real good shot of seafoam into the cylinders, replace plugs, let sit 15 minutes. restart, and spray the rest of the seafoam into the carbs, so the the motor almost stalls, wait and repeat until the seafoam is gone.then take for a wide open spin. then put in new plugs, ad premixed gas to the tank, and take it for a wide open throttle spin. it is going to smoke like a house on fire, during this process.

 

[bfast1fishing]

Re: 1994 150hp evinrude oil pump?

Thanks to both of you for some good sugestions that I would not have thought of. Thanks, Bfast