1990 evinrude 70hp, stalls @ wot

[Waterlogged_xj]

Hello everyone,

My old name wouldn't let me on, so I had to make a new one...


Anyway, I was on here last summer and recieved tons of help and info on some minor repairs by many of you and really appreciate it!

Heres the deal:

I have a 1990 evinrude 70hp that bogs down @ wot. It idles great and runs its' balls off @ 3/4 throttle, but as soon as I open it up, it bogs down. Kinda like it's starving for fuel. I had my buddy pump the primer bulb during the bogging and there was no improved response, just seems like I was flooding it. There is new gas in there too.

So we broke the carbs down and dunked them in chem dip for about 20 mins each, carb cleaned them, compressed air ran through, and sprayed them again w/ carb clean. We adjusted the floats per the carb kit instructions which was 3/4" down from float bowl and then checked if the float was parallel w/ float bowl when inverted. We then adjusted the idle screw all the way in and then backed it out 3 1/2 turns on all. That all check out and it still fallls on its' face @ wot?

The service manual says to set them floats at 1 1/8" - 1 5/8"... We are going to try that tomorrow if the rain breaks.

Can you guys please help me out once again?


Thanks!


Jeff

 

[HighTrim]

Re: 1990 evinrude 70hp, stalls @ wot

Jeff did you get to the high speed jet and clean it thoroughally? Will choking improve things?

Also is this a portable fuel tank or built in?

 

[tashasdaddy]

Re: 1990 evinrude 70hp, stalls @ wot

as Chris asked did you use the special screwdriver to remove the high speed jets. picture below. also this. http://forums.iboats.com/showthread.php?t=167352

 

[Waterlogged_xj]

Re: 1990 evinrude 70hp, stalls @ wot

Thanks for the quick reply!

Yes, we cleaned the high speed jets out and the entire carb thoroughly... Choking it from the primer soleniod manually (engine running) will kill it. Tanks are removable too.

 

[jtexas]

Re: 1990 evinrude 70hp, stalls @ wot

If the hi-speed jets are good, a misadjusted float would be a good next place to look. hold it upside down and make the float parallel with the body.

Did you replace the float valves and valve seats? Sticky float valve will behave similarly.

I have found you can check the operation of your float valves by blowing thru the inlet. Carb rightside up should be very little resistance, upside down no air should pass. Drain the bowls first. Premix is an acquired taste.

 

[Waterlogged_xj]

Re: 1990 evinrude 70hp, stalls @ wot

Thanks guys for the input... I'm going to readjust the floats again today and see if that works. I'll let everyone know what the outcome is later on this evening.

Thanks,

Jeff

 

[tashasdaddy]

Re: 1990 evinrude 70hp, stalls @ wot

of course manually using the primer soleniod will kill it by flooding. did it start right back up. did you check spark on all three, when it died?