DblEagle
Recruit
- Joined
- Sep 5, 2018
- Messages
- 5
Outboard : 1987 3cyl 2 stroke 80HP Mercury
engine s/n A724272 made in Canada
Carbs 3301-9012 WME-1's
Issue : in gear on water advancing the throttle from zero to half throttle the rpms do not increase. If the throttle is advanced any further the engine gently stumbles once and stalls.
Outboard does not have a traditional choke, it has an electronic enrichener system that squirts gas past the carbs when the key is pressed in.
If I leave the throttle at the point just before it stalls (half way) basically idleing then bump the key, the boat jumps up onto a plane and will accelerate to WOT.
History
Inherited this outboard from my dad who lost confidence in it after having his mechanic throw parts at it (all electronics replaced but had intermittent issue where the motor would not run past 1800 rpms.) . I found the float needles were the old rubber tipped ones that had ethonal issues and they were sticking and causing fuel starvation.
After rebuilding carbs with new kits the boat starts easy (for a 3 looper) but doesn't seem to want to accelerate unless the key is bumped until the high speed jets kick in.
Pulled the carbs off again, soaked and meticulously cleaned and blown through. The carbs have the emulsion tube that extends down into the bowl, and a smaller tube within the emulsion that goes to the very top of the carb. One of the smaller tubes on the middle carb doesn't extend quite as far down as the other two carbs and it looks like it has been pushed too far up into the top of the carb and someone has used a slot screwdriver to try to push it back down causing a notch to be put into the brass small tube. I have attached a photo of the top damaged part of this tube. Could this cause the symptoms I have described? I don't want to put it all back together, check timing and link and sync if I will be taking it apart to put in a replacement carb anyways.
Sorry for the long post
thank you
Graham
engine s/n A724272 made in Canada
Carbs 3301-9012 WME-1's
Issue : in gear on water advancing the throttle from zero to half throttle the rpms do not increase. If the throttle is advanced any further the engine gently stumbles once and stalls.
Outboard does not have a traditional choke, it has an electronic enrichener system that squirts gas past the carbs when the key is pressed in.
If I leave the throttle at the point just before it stalls (half way) basically idleing then bump the key, the boat jumps up onto a plane and will accelerate to WOT.
History
Inherited this outboard from my dad who lost confidence in it after having his mechanic throw parts at it (all electronics replaced but had intermittent issue where the motor would not run past 1800 rpms.) . I found the float needles were the old rubber tipped ones that had ethonal issues and they were sticking and causing fuel starvation.
After rebuilding carbs with new kits the boat starts easy (for a 3 looper) but doesn't seem to want to accelerate unless the key is bumped until the high speed jets kick in.
Pulled the carbs off again, soaked and meticulously cleaned and blown through. The carbs have the emulsion tube that extends down into the bowl, and a smaller tube within the emulsion that goes to the very top of the carb. One of the smaller tubes on the middle carb doesn't extend quite as far down as the other two carbs and it looks like it has been pushed too far up into the top of the carb and someone has used a slot screwdriver to try to push it back down causing a notch to be put into the brass small tube. I have attached a photo of the top damaged part of this tube. Could this cause the symptoms I have described? I don't want to put it all back together, check timing and link and sync if I will be taking it apart to put in a replacement carb anyways.
Sorry for the long post
thank you
Graham
