MikeA57
Well-known member
Got my boat ready for the recent Labor Day weekend by installing a brand new MK trolling motor and then I checked out the 1980 25 hp Mercury and although hard to start to begin with, once I got it started it ran fine for about 45 minutes. I stopped and started it several times and it started on the 1st pull every time.
I got to the lake and tried to start it and it wouldn't start for anything. I ended up using my new TM to get me from the ramp to the cabin. I didn't have a lot of time to spend trying to figure out why it wouldn't run over the weekend, but once back home I dug into it. What I found was that the choke is not opening the butterfly at all. If I manually open it, the motor fires and runs but as soon as I let go of the throttle the butterfly closes and it dies. Once the motor is warm though it starts and runs OK.
The choke on this engine is a rotating knob that has several detents for increasing the idle speed to keep it running while it is cold. Once it warms up you can set the idle back to normal. The last position on the rotating knob is full choke. My question is: What is supposed to make the butterfly open when the knob is rotated all the way around to the choke position?
Thanks!
Mike
I got to the lake and tried to start it and it wouldn't start for anything. I ended up using my new TM to get me from the ramp to the cabin. I didn't have a lot of time to spend trying to figure out why it wouldn't run over the weekend, but once back home I dug into it. What I found was that the choke is not opening the butterfly at all. If I manually open it, the motor fires and runs but as soon as I let go of the throttle the butterfly closes and it dies. Once the motor is warm though it starts and runs OK.
The choke on this engine is a rotating knob that has several detents for increasing the idle speed to keep it running while it is cold. Once it warms up you can set the idle back to normal. The last position on the rotating knob is full choke. My question is: What is supposed to make the butterfly open when the knob is rotated all the way around to the choke position?
Thanks!
Mike