1998 Evinrude 60HP 2 stroke Slow Max Speed

[Xfactoreffect]

1998 Evinrude 60 HP 2 stroke on a 17ft 1991 Swan point. I went out on the water this weekend, and when I was accelerating, everything seemed fine except that I was going about half speed with the throttle fully forward. The engine sounds normal; it doesn't sound like it is bogging down. I swapped spark plugs and played with the linkage for the throttle cables on the motor side( I had a trolling motor installed, and when they ran the wiring to the center console, I noticed the throttle cables were pulled out a little more than usual, but I don't think that's part of the issue.) and nothing helped. I did a compression check, and all three cylinders are reading 90 on the dot. I had this out 2 weekends ago, and there was no issue. They also disconnected my tach, and I can't figure out what/where it is disconnected. I couldn't tell what RPMs I was getting on the water. I replaced the impeller and rebuilt the carbs a couple of months ago and have had no issues. Any advice would be helpful. Thanks in advance.

 

[Crosbyman]

stuff happens... even if you did clean the carbs.
recheck fuel supply from tank to carbs if sparks are OK check venting , fuel pick-up etc...

 

[flyingscott]

Check Spark

 

[jimmbo]

Welcome to iboats

Are all Cylinders receiving a Spark that can jump a 3/8" gap?
Are all the carbs getting Fuel? That is critical, as No Fuel, or not enough Fuel, means not enough Oil for that Cylinder.

Also who is this "They" you mention twice in the Post?

The Tach would get its Signal from the Alternator.

 

[Xfactoreffect]

Welcome to iboats

Are all Cylinders receiving a Spark that can jump a 3/8" gap?
Are all the carbs getting Fuel? That is critical, as No Fuel, or not enough Fuel, means not enough Oil for that Cylinder.

Also who is this "They" you mention twice in the Post?

The Tach would get its Signal from the Alternator.

Spark is good. I found a fuel line that has cracks, and I'm hoping this is the cause of the issue. It was a portion that was hidden, and somehow I got the right angle to see it.

"They" are a company I paid to install my trolling motor/depth/transducer. It was just a coincidence that this happened after the install, when I had it out the week before, no issues.

Currently chasing lines for the tach to see where the problem lies there.

Thank you all for the assistance. I'm new to this and trying to soak up as much as I can. I will let you know if this fuel line fixes the problem or not.

 

[jimmbo]

'spark is good" is not an answer to my Question. A lot of people will take a plug out, ground it and check for spark. A spark under those conditions doesn't mean there will be spark in the cylinder under compression pressure. Air is a fairly good Insulator, and the more Dense it becomes the better an Insulator it is. Thus Voltage required for a Spark to jump the plug gap rises considerably when it is in use. That is why we need to know if it can jump a much larger gap at Atmospheric Pressure
That motor is almost 30 yrs old. Fuel Line can also deteriorate internally, and can become Check Valves, preventing flow, yet look perfectly fine on the outside.
I doubt the installers unhooked the Tach, as they would have had to run Proprietary Wires for the Depth/Fish Finder. Trolling Motor would have its own Harness. Is the Depth Finder a Gauge? If install in the Dash, maybe the Tach wire had been unhooked to make room for the Depth Gauge, but they should have reconnected it. You can ask...