Palssonater
Seaman
- Joined
- Jul 3, 2007
- Messages
- 60
Wow, I just stumbled onto this site a couple of days ago and can't believe the amount of time I have spent reading. What an amazing wealth of knowledge here!
I orginally found this site when I was looking for a fix for my 1984 Evinrude 35HP. It was flooding itself upon throttle up and was being very picky to get it start. All sorts of issues. Backfires, coughs, rough "almost starts", and handwrenching pulls. The motor when running would have soaked plugs when pulled.
Over the past two weeks I've been up and down the motor. The carb was cleaned and the needle and seat tested to 6psi and held. I checked the fuel pump to find that in working order. Went as far as the Reed/Leaf valves to find that there was some slight spacing between the metal reeds/leafs and the leaf plate. Figuring that could be my problem(I am fairly new to outboards), I switched those out to no avail.
Finally got it running fairly consistent and proceeded to completely close the fuel mixture screw/needle adjustment on the carb. The motor continued to run. I found this quite odd as there should be no fuel delivered. I removed the primer hose and dead ended the primer nipple to find out that the motor then died. After I gave the fuel mixture screw approx 2 turns the motor then ran fine with the primer disconnected. Dissasembling the primer I found the valve had a slow leak and would not hold pressure meaning that it had failed.
Does it make sense that at High speed the motor developed enough suction to bring in fuel through the primer(which is tapped from the bottom of the float bowl)? Or if the primer does not have the ability to hold air, the pressure created by the fuel pump could essentially push fuel through the primer and up to the carb?
We then got the motor out on the water and tuned for a dry golden brown coloring on the plugs using the fuel mixture screw. She's been running great for a while now.
These are my findings. I am not saying that I was right, but it seems to have corrected the problem. Thought I would ask for some thoughts and comments and make my first post a good one!
I orginally found this site when I was looking for a fix for my 1984 Evinrude 35HP. It was flooding itself upon throttle up and was being very picky to get it start. All sorts of issues. Backfires, coughs, rough "almost starts", and handwrenching pulls. The motor when running would have soaked plugs when pulled.
Over the past two weeks I've been up and down the motor. The carb was cleaned and the needle and seat tested to 6psi and held. I checked the fuel pump to find that in working order. Went as far as the Reed/Leaf valves to find that there was some slight spacing between the metal reeds/leafs and the leaf plate. Figuring that could be my problem(I am fairly new to outboards), I switched those out to no avail.
Finally got it running fairly consistent and proceeded to completely close the fuel mixture screw/needle adjustment on the carb. The motor continued to run. I found this quite odd as there should be no fuel delivered. I removed the primer hose and dead ended the primer nipple to find out that the motor then died. After I gave the fuel mixture screw approx 2 turns the motor then ran fine with the primer disconnected. Dissasembling the primer I found the valve had a slow leak and would not hold pressure meaning that it had failed.
Does it make sense that at High speed the motor developed enough suction to bring in fuel through the primer(which is tapped from the bottom of the float bowl)? Or if the primer does not have the ability to hold air, the pressure created by the fuel pump could essentially push fuel through the primer and up to the carb?
We then got the motor out on the water and tuned for a dry golden brown coloring on the plugs using the fuel mixture screw. She's been running great for a while now.
These are my findings. I am not saying that I was right, but it seems to have corrected the problem. Thought I would ask for some thoughts and comments and make my first post a good one!
