Evinrude 2.5 ID and Carb

[dbuffington]

Hi Folks!

I recently picked up a nice little two-cylinder Evinrude 2.5 (Model E3RCUA, Serial B1368474). Two questions ...

- What year is this outboard?

- The motor was stored unused for many years, and there was no fuel in the tank. I refilled it with fuel/oil mix and checked the plugs. (They're in OK condition and properly gapped.) The primer bulb pushes fuel to the filter, which is clean. But still, the engine does not start or even cough. I suspect fuel is not getting to the cylinders. Any suggestions?

Thanks!
Dave

 

[kbait]

'87. Some of those have a fuel shut-off incorporated into the choke handle, so make sure that's open. Pull over slowly and see if it feels like compression on both cylinders. Pull spark plugs and check spark.. should jump over 1/4" in open air from both leads. If all is good, and still no start, squirt a bit of premix in each plug hole and try again. If it runs for a few seconds and dies.. you have a fuel delivery issue.

Good luck!

 

[Vic.S]

Date letters CU make it a 1987 model as stated above.

Check sparks as suggested, should jump best part of 7/16".


Beg, borrow or steal a compression tester and do a proper compression test if possible..

You say fuel reaches filter, check that it also reaches the carb!.
check that the fuel pump works OK but even if it does not it should be possible to start once primed and keep running by squeezing the bulb..

i believe it has a primer pump rather than a flap type choke. Check that it does pump fuel when operated.

carb may need cleaning esp if originally left with fuel in it. but should still fire if fuel is sprayed in to the carb throat

BTW correct fuel mix is 50:1 even if decals and manual say 100:1

 

[dbuffington]

i believe it has a primer pump rather than a flap type choke. Check that it does pump fuel when operated.

You got me pointed in the right direction … The primer pump has to be pulled out and the first dozen or so times I pulled it out it only came out about 1/4 inch.

So when I tried it again I pulled a bit harder and then it came out about another 1/4 inch. When that happened, I could feel and hear the primer pump compressing (some sort of bladder, I suspect). That gave the motor the fuel it needed, and it started right up.

Thanks!
Dave