Hello,
I've got a 1987 Mercruiser 140 with the Mercarb. I recently purchased this, and have been learning a lot about boats (love this forum). Had it on the lake last week, and it would bog on acceleration from time to time and would not drop below 3k rpms after shifting back into neutral. I spent some time on it this week rebuilding the carb (idle rough as well..) and making what I thought was a minor adjustment to one of the cables to fix the de-acceleration issue..
So - took it to the lake today, started ok, idled around 1100rpms..didn't bother me too much, figured I could adjust that now that I was on the lake. Once I was clear of the marina, I gave it some throttle and it just died. Started it, gave it some throttle..and it died again! Here's what I did while I was on the lake to troubleshoot:
Disconnected the carb throttle cable so I could manually throttle it up w/o putting it in gear. Would immediately die when I pushed the throttle lever. I verified that the rod that connects that to the accelerator pump was in place, and I had a strong stream of gas coming from the (venturi cluster?) when I pressed the throttle lever. After fiddling with things for a while, I figured it was better to take it home. I now have the carb in pieces again, and plan on putting it back together tomorrow & try again. I'm pretty sure I had all the measurements correct on the float & whatever throttle linkage there is.
So..If this doesn't work , where else should I look? I did pump some gas into a jar and let it settle - no water. Bowl appeared to always be full of gas. It would die immediately, so surge or anything. Sometimes a backfire would happen, or a backfire when I started it up again.
Thanks! I'll post the results of any suggestions after I try them.
I've got a 1987 Mercruiser 140 with the Mercarb. I recently purchased this, and have been learning a lot about boats (love this forum). Had it on the lake last week, and it would bog on acceleration from time to time and would not drop below 3k rpms after shifting back into neutral. I spent some time on it this week rebuilding the carb (idle rough as well..) and making what I thought was a minor adjustment to one of the cables to fix the de-acceleration issue..
So - took it to the lake today, started ok, idled around 1100rpms..didn't bother me too much, figured I could adjust that now that I was on the lake. Once I was clear of the marina, I gave it some throttle and it just died. Started it, gave it some throttle..and it died again! Here's what I did while I was on the lake to troubleshoot:
Disconnected the carb throttle cable so I could manually throttle it up w/o putting it in gear. Would immediately die when I pushed the throttle lever. I verified that the rod that connects that to the accelerator pump was in place, and I had a strong stream of gas coming from the (venturi cluster?) when I pressed the throttle lever. After fiddling with things for a while, I figured it was better to take it home. I now have the carb in pieces again, and plan on putting it back together tomorrow & try again. I'm pretty sure I had all the measurements correct on the float & whatever throttle linkage there is.
So..If this doesn't work , where else should I look? I did pump some gas into a jar and let it settle - no water. Bowl appeared to always be full of gas. It would die immediately, so surge or anything. Sometimes a backfire would happen, or a backfire when I started it up again.
Thanks! I'll post the results of any suggestions after I try them.