1995 Merc 75 Tracker..won't stay running fast

[trollking]

I had this problem a couple years ago, and can't remember how I fixed it.

Engine has run fine for last couple years. Last week, ran 20 minutes or so at 4600 to the crab traps. After pulling traps, engine would ramp up but then fall off, back to around 2800 rpm, and not want to go faster. Backing off the throttle, I'd ramp it up again, and maybe it would rpm up, maybe not, but would not hold the speed.

I checked the plug wires and changed the spark plugs (they looked fine).
I changed the fuel/water filter (there was NO water in the gas)
I changed the fuel line squeeze bulb.

did a fishing run, ran about 15 minutes to fish, then 15 minutes back when done...all was fine.

then went fishing again...about a 20 minute run to the grounds, then back 20 minutes. After picking the crab gear (no crab!) same problem.

What else should I try? I'll put a fuel conditioner in, but I've been going through the fuel pretty consistently, and have been buying at the same gas station for years.....

Any suggestions would be appreciated, posted here or to my email
stevek@iphc.washington.edu

 

[Laddies]

Re: 1995 Merc 75 Tracker..won't stay running fast

Try to pump the bulb when it acts up to see if it's a fuel pump problem,when it loses RPM how many you might also have a ign system failure that when cool done show.

 

[trollking]

Re: 1995 Merc 75 Tracker..won't stay running fast

We did try the bulb, and it only took about two squeezes to be 'tight'. Also, have the kicker on a Y from the fuel/water separator, and made sure kicker bulb was not going flat.

 

[Laddies]

Re: 1995 Merc 75 Tracker..won't stay running fast

While the engine is acting up you need to test all cyls. for spark

 

[Evinrude15]

Re: 1995 Merc 75 Tracker..won't stay running fast

You may be running a little rich. Check your carb adjustments