Bought a1983 Mercury 18 hp had to replace nearly all of electronics to get spark. have good spark and compression of 140 & 150 lbs I went ahead and cleaned the carburetor with carb cleaner. Spayed it into all passages and checked needle valve and float both looked good. Put it all back together...
I found my own answer watching a video of a man changing the same parts and he had everything laid out as it came apart. The part I asked about goes into the front of the shift shaft before what I call the tip goes in against it. It all goes in and works the spring action for the shift shaft...
I took a 1986 4 HP Mercury outboards Prop shaft out to replace the oil seal and O ring. when cleaning out the leftover gear oil in the housing I found up under the front gears a solid piece of metal. It wasn't something that broke off somewhere, it looks like a plug of some kind with a slight...
I use torch tip cleaners if when I spray carb cleaner in a hole it doesn't come out anywhere. I do that after the soaking. airshot said be carful with using acetone so I just went out and took the lid off of the container I soak my smaller carbs in to check the plastic that's on it. All is well...
I have had it melt rubber and soft plastic, like the bushings for some of the main jets but not the hard plastic yet, it probably depends on the type of plastic. I saw on you tube a guy using acetone, so I tried it and ruined the tip of a float needle that was rubber and a red main jet bushing...
I ordered a carb kit and it should be here this week, week of the 21st. I have it apart and soaking in acetone. All except the float needle valve with the rubber tip. Had one dissolve on me. The all metal ones I will soak along with the rest of the carb. I did notice some dirt in the float bowl.
I am going to rebuild the carb and change the impeller, I have one for it, but not all the parts that I need for the carb I will order a new carb kit. I have to start working on some of the other motors pretty soon to get them ready by spring. I have one Mercury that has no spark, not sure what...
It's gone, I sold it in the summer. I had two of them last summer the other one was an 83 Evinrude basically the same motor only newer and it had I believe 105 & 115 lbs. of compression in the cylinders. I was afraid the 72 might not run, but it ran good. Again I read that an outboard will run...
I didn't work on the carb yet, I put it off because I think I'm going to keep it and worked on others that I knew I was going to sell. I usually take them all apart and soak them in asatone for a day except the float needle if it has a rubber tip, they will dissolve as will the plastic or rubber...
I checked the spark, but don't remember how much gap it was shooting across. I didn't do the carb when I bought it as I usually do because I am thinking about keeping it to troll for crappies with and just put it off till later. It turns over easy and it is easy to carry. I do have two or three...
I don't think the two cylinders need as much because the pistons are helping each other out. I bought a 1972 25hp from a guy that said it ran, it didn't it had a tiller on it but was set-up for remote operation. I changed it back to tiller operation. It had no spark at all I filed the two sets...
So why didn't it keep running last year ? My next bet would be the carb, how about you? Thanks for your input. It all makes sense now why there wasn't much change in the compression from before to after teardown. I learn by my mistakes or by tearing something apart for the first time. And for...
