matthewharrison
Member
Okay, theres a bit of a story behind this so bare with me. As the title says, I have a 1990 Merc 40, 4 cylinder 2 stroke. I just recently finished rebuilding the motor, in the process of rebuilding I took out the driving gear for the oil injection & now mix it 50:1. After finishing the rebuild I got it to run but had trouble keeping it running, found the cork gasket in the float bowl of one carb was torn, so I made my own out of an o-ring to get me by while I waited for my carb kit to come. Got it to run but it would spit & sputter every now & again, found out that problem was a broken magnet on one of the ignition coils, swapped for a new coil & it finally ran good. This was all done on muffs in the driveway.
We finally towed it down to the wharf and launched the boat. Had a hard time getting it to start & stay running at first, finally got it running and started out into the water. While we were going I had the throttle wide open in forward but it definitely was not getting up to the RPM it should, in neutral it would rev up fine, but once in forward it wouldn't come near the same. After about 5-10 minutes the motor started stalling every now & again. The stalling started getting more frequent to the point where we could only get it to run for a few seconds before it would stall again. We ended up getting towed back in. I figured the majority of this was all related to the carb & the carb kits I ordered would solve those issues.
After getting the boat back home I decided to try it on the muffs again to see if it would make any difference, but it didn't. The motor would start for a few seconds then die out. It was dark out so I gave up on it for that night. The next day I went out & tried it again, I noticed fuel leaking out a bunch so decided I needed the carb kit before going any further.
Today I got my carb kits, new gaskets in both carbs, put them back together & back on the boat. Hooked it up to the muffs & couldn't get a kick out of it. After trying it some more it finally kicked but didn't stay running. I'm still seeing fuel dripping, it's dripping off the bottom part of the throttle lever on both carbs. I can't tell if it's run off from somewhere else or if it's leaking out lower throttle lever part that connects the 2 carbs. I did notice fuel coming out the front of the carb throat too. Is it flooding itself?
Not sure where to go from here, so if anyone has some ideas feel free to throw them at me.
We finally towed it down to the wharf and launched the boat. Had a hard time getting it to start & stay running at first, finally got it running and started out into the water. While we were going I had the throttle wide open in forward but it definitely was not getting up to the RPM it should, in neutral it would rev up fine, but once in forward it wouldn't come near the same. After about 5-10 minutes the motor started stalling every now & again. The stalling started getting more frequent to the point where we could only get it to run for a few seconds before it would stall again. We ended up getting towed back in. I figured the majority of this was all related to the carb & the carb kits I ordered would solve those issues.
After getting the boat back home I decided to try it on the muffs again to see if it would make any difference, but it didn't. The motor would start for a few seconds then die out. It was dark out so I gave up on it for that night. The next day I went out & tried it again, I noticed fuel leaking out a bunch so decided I needed the carb kit before going any further.
Today I got my carb kits, new gaskets in both carbs, put them back together & back on the boat. Hooked it up to the muffs & couldn't get a kick out of it. After trying it some more it finally kicked but didn't stay running. I'm still seeing fuel dripping, it's dripping off the bottom part of the throttle lever on both carbs. I can't tell if it's run off from somewhere else or if it's leaking out lower throttle lever part that connects the 2 carbs. I did notice fuel coming out the front of the carb throat too. Is it flooding itself?
Not sure where to go from here, so if anyone has some ideas feel free to throw them at me.