Boomerhuntsduck
New member
I have a problem that has been unsolvable for the last 18 months. I have the OEM manual and have not fully followed the troubleshooting (my bad, wish I could start over)....
The current condition: Idles great, midrange steady and smooth, and throttles up to 5200, then suddenly drops to 4200 WOT after 1-3 minutes. Won't come back to 5200 unless I wait a day. Will continue to run smooth at 4200 but is WOT.Each and every time I run the boat on a "new trip" it will come backup to 5200, but will not come back to 5200 during a "same day"event. Very frustrated, it's been doing this for 18 months, probably 12 trips and 250 miles on it with it acting up.
Prior to this: Motor was flawless at high rpm for 10 years that I have owned it. 18 months ago, I decided to fix the Evinrude sneeze (really wasn't a big problem, but I drill down to small things). 100% fixed the low idle sneeze by changing to Chris Carson reeds and rebuilt all carbs. However, I ended up with a 4200 rpm motor.
It has a noticeable higher sound frequency when it jumps up to 5200. And when the rpm's drop down you hear it first then feel it.
From newest to oldest, I threw parts at it:
-New CDI powerpack
-New CDI coils and wires
-New CDI rectifier
-New Champion plugs, yes QL78YC.
-New fuel filter and water separator
18 months ago
-New Chris Carson Reeds and gaskets (fixed sneeze)
-Rebuilt all Carbs (fixed sneeze)
-compressions 95,95,95,90,90,85 (cold) #6 is 85 NOTE: I did this with engine cold and one plug at a time. Did not realize you have to pull all the plugs.
Again, Prior to this issue it ran up to 5200 just fine, same prop, all new fuel lines and fuel tank. New fuel pump, removed VRO. It wasn't until I fixed the sneeze a year ago that I started having this problem.
The current condition: Idles great, midrange steady and smooth, and throttles up to 5200, then suddenly drops to 4200 WOT after 1-3 minutes. Won't come back to 5200 unless I wait a day. Will continue to run smooth at 4200 but is WOT.Each and every time I run the boat on a "new trip" it will come backup to 5200, but will not come back to 5200 during a "same day"event. Very frustrated, it's been doing this for 18 months, probably 12 trips and 250 miles on it with it acting up.
Prior to this: Motor was flawless at high rpm for 10 years that I have owned it. 18 months ago, I decided to fix the Evinrude sneeze (really wasn't a big problem, but I drill down to small things). 100% fixed the low idle sneeze by changing to Chris Carson reeds and rebuilt all carbs. However, I ended up with a 4200 rpm motor.
It has a noticeable higher sound frequency when it jumps up to 5200. And when the rpm's drop down you hear it first then feel it.
From newest to oldest, I threw parts at it:
-New CDI powerpack
-New CDI coils and wires
-New CDI rectifier
-New Champion plugs, yes QL78YC.
-New fuel filter and water separator
18 months ago
-New Chris Carson Reeds and gaskets (fixed sneeze)
-Rebuilt all Carbs (fixed sneeze)
-compressions 95,95,95,90,90,85 (cold) #6 is 85 NOTE: I did this with engine cold and one plug at a time. Did not realize you have to pull all the plugs.
Again, Prior to this issue it ran up to 5200 just fine, same prop, all new fuel lines and fuel tank. New fuel pump, removed VRO. It wasn't until I fixed the sneeze a year ago that I started having this problem.