Brandon12345
Cadet
- Joined
- Jun 12, 2011
- Messages
- 29
First time poster as well as first time boat owner. Long story short, bought a bass boat with '79 Evinrude 100hp 100999S. I wasnt able to test it on the water, but ran it on the muffs and had the PO do a compression test for me. He said the carbs hadn't been cleaned for awhile, so I knew going in that I would probably have to do that. I have ordered the OEM carb kits for both carbs and they should be in this week. However, I wanted to see if anyone had any ideas if the issue I am running into might be strictly related to the carbs or something else. Here is a rundown of my activity and what is happening:
1. I can run it on the muffs just fine, no problems there
2. On the water, the engine starts when I launch it in the water and with the starter lever up, idles in the 1600-1800 range. once I drop the lever, the idle drops down to around 500-600 range. If i slowly put it into either forward or reverse, it dies. If I do it swiftly and forcefully, it will usually stay running but occasionally dies as well. After getting it running in forward, I try to run it at WOT but it will sputter and die. After doing this a couple of times, the engine will not turn over and start again for 1+hours(both times i took it off the lake within 45 minutes because it wouldnt start). i have inspected my fuel lines for any obvious leaks and I see none. I prime the prime bulb to start the engine, but even when it starts, the bulb doesn't ever get tight. I plan on changing the spark plugs because they look like they have a bit of corrosion on them, but I didnt think they would be the source of the problem I am having. (edit: i will also add that the current spark plugs are not the Champion QL or L77JC4's)
Does it sound like a carb rebuild "should" do the trick? From the research I have done on here, sounds like it is a carb/float problem to me but I am definitely not a mechanic.
Any other ideas or suggestions on what I can/should test? Obviously I am rebuilding the carbs regardless but I am hoping i dont have to replace the fuel pump or anything else.
1. I can run it on the muffs just fine, no problems there
2. On the water, the engine starts when I launch it in the water and with the starter lever up, idles in the 1600-1800 range. once I drop the lever, the idle drops down to around 500-600 range. If i slowly put it into either forward or reverse, it dies. If I do it swiftly and forcefully, it will usually stay running but occasionally dies as well. After getting it running in forward, I try to run it at WOT but it will sputter and die. After doing this a couple of times, the engine will not turn over and start again for 1+hours(both times i took it off the lake within 45 minutes because it wouldnt start). i have inspected my fuel lines for any obvious leaks and I see none. I prime the prime bulb to start the engine, but even when it starts, the bulb doesn't ever get tight. I plan on changing the spark plugs because they look like they have a bit of corrosion on them, but I didnt think they would be the source of the problem I am having. (edit: i will also add that the current spark plugs are not the Champion QL or L77JC4's)
Does it sound like a carb rebuild "should" do the trick? From the research I have done on here, sounds like it is a carb/float problem to me but I am definitely not a mechanic.
Any other ideas or suggestions on what I can/should test? Obviously I am rebuilding the carbs regardless but I am hoping i dont have to replace the fuel pump or anything else.