dwyork@hotmail.com
Petty Officer 2nd Class
- Joined
- Jan 14, 2009
- Messages
- 178
I have a 1983 Merc 115 inline 6 and I have rebuilt the carbs and fuel pump and replaced all of the wiring between the switchboxes and coils (as they were badly corroded and breaking). I have also replaced the plugs and plug wires. Initially I was getting what seemed to be limited spark on 1, 3, & 5 so I replaced the switchbox and I seem to be getting spark on all 6 now. The fuel lines seem to be clean and free from debris and the fuel tank pick up and vent are clear as well. When I got this boat I took it out and it seemed to run really good and opened up to full throttle. I only ran it for a few minutes at WOT and then came back to get one of my buddies from the dock. When I took back off the motor was stalling out at about 2K RPM - That was last summer and since then I have done all of the work described previously. Now the motor starts fine and idles pretty well, but seems to need the carbs synced. But as soon as I throttle up to about 1500 - 1800 RPM the motor starts bogging down and missing and if you go a little further the motor will start surging and RPMs will jump up and down. I had it out on the lake and if I open to full throttle in gear it will bog all the way down and not run any further than 2500 RPM, but still moving at the 1500 RPM speed. I have done resistance tests on the stator, trigger, and rectifier and all test within my manuals specs and compression is good. Can anyone tell me what I might be missing? And what other test I can do to help keep me from dropping a ton of money on parts that I may not need?
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