1978 evinrude 140 v-4 cross flow

[boatmoter]

need help..have a evinrude 140, 1978, will not start without starting fluid, when running,will not idle below 1000 rpm's without stalling,does not miss fire, responds well to throttle increase.. heres what I have tried..a known good set of carbs off a running motor, timer base, tune up, compression test-- (range from 90 to 115).., new fuel pump, known good coils,stator,power paks, every thing I have tried has not made any difference at all..still have same symtems.. this feels like being stuck on a sand bar..any clues to this mystery???

 

[JB]

Re: 1978 evinrude 140 v-4 cross flow

Howdy Boat. . .<br /><br />Don't use starter fluid. It has no lubricant and can wash your cylinder walls, with terrible results. Use premixed fuel.<br /><br />I think you have an air leak, probably between carbs and reed block or between reed block and crankcase.<br /><br />Good luck.

 

[Terry H]

Re: 1978 evinrude 140 v-4 cross flow

what JB says...and be sure to use choke...make sure choke is working...just a Thought

 

[Chinewalker]

Re: 1978 evinrude 140 v-4 cross flow

Along JB's line of thinking - check the crankcase seals - upper and lower...<br />- Scott

 

[Maximum Gravity]

Re: 1978 evinrude 140 v-4 cross flow

One last tip on starting 2-strokes, WD-40 is flamable and contains oil. Gotta go with JB's diagnosis, definately sounds like an air sucking/leaking problem.

 

[JB]

Re: 1978 evinrude 140 v-4 cross flow

About the WD-40.<br /><br />It used to be propelled by propane, which made it a near perfect starting fluid for 2 strokes. <br /><br />Unfortunately, within the past year or so they replaced the propane with CO2. Now it is a fair fire extinguisher, though still "flammable". <br /><br />If you have a spray can of the old stuff, it will be labeled "Extremely Flammable". The newer stuff is merely labeled "Flammable".<br /><br />If you have a case or two of the old spray cans you can probably get mucho dinero for them from 2 stroke wrenches.

 

[Maximum Gravity]

Re: 1978 evinrude 140 v-4 cross flow

Learned something new. Admitedly, it has been 2 years plus that I have been behind the counter instead of behind the wrenches....

 

[boatmoter]

Re: 1978 evinrude 140 v-4 cross flow

thanks for the tech info..I was kinda thinking crank seals..but needed more opinions on the cure...I think I will cover all the bases and do crank seals, reed valves,and intake gasket,and carb gaskets ,might as well go with rings too... am I missing anything??this is a great site..keep up the with the great tech info..boatmoter///