1991 115HP lost power / bogging down

[The Adventure Pak]

Thank you all in advance for the help on this.

My 1991 115 has been a great motor up until a week ago. I took it out on a Friday night and had no issues. Went out again Saturday morning and she had lost all power. At WOT, I could only get up to about 5mph on my 1991 Nitro 180FS and so the work began. It definitely felt like a fuel starvation issue.

To this point I have completed the following:
-Thoroughly cleaned the carbs - the floats seem to be working just fine, all jets are clear.
-Replaced the fuel lines under the hood
-Replaced the VRO pump with a Non-VRO Fuel Pump (through the guidance of my local shop)
-Replaced all 4 plugs (they all look good and show normal coloring)


Prior to replacing the VRO Pump, I bought a rebuild kit and rebuilt it. It almost seemed to work at idle, but would only run for about 2 min before it died. I could run it just fine as long as somebody was pumping the primer bulb.

I replaced the fuel pump tonight and took it out to the lake. She cranks right up and idles just fine. When I put the throttle into bypass mode, I can rev it to the moon and it has no issues, doesn't lag, sputter, just runs out fine. But, as soon as you put it in gear, it bogs down and just won't go. I took a quick video and put it at this link: https://youtu.be/mcfbS9zP5j8

Does anyone have some ideas on what I can do next?

Thanks!!

Jeremy

 

[racerone]

Maybe it is Not a fuel problem------Test compression and post the numbers.-----Test for spark on all leads.

 

[The Adventure Pak]

racerone Thanks for the help. I completed a warm compression test today. All cylinders are within 10% and in the 95-100 range.
Cyl 1 = 100psi
Cyl 2 = 95psi
Cyl 3 = 100psi
Cyl 4 = 100psi

I need to pick up a spark tester and check that later tonight.

This is perplexing in that just the other day, even with the bad fuel pump and my son pumping the primer bulb, it rand just find. Crazy!!

I'll let you know what I find.

Thanks
Jeremy

 

[racerone]

Check the flywheel key ?

 

[boobie]

Do a cylinder drop test on it when it's acting up.

 

[The Adventure Pak]

Gang, I just completed a spark test and have good spark on all 4 cylinders.

racerone I'll take a look at the flywheel key. Didn't think to try that.

Thanks!