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Old 07-03-2015, 08:18 PM   #21
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Ok. Boat is repaired and we took it out a few days ago and it ran great! It was my first experience with it actually using it out on the water doing our family thing and I noticed that the trim gauge wasn't working and it was a bit hard to start. I opened up the engine compartment and saw that the choke wasn't completely closed. I held the choke closed, it was open about 1/4 inch, and had my wife turn the key and it started and ran great. Any ideas on repairing or replacing the trim sending unit and getting the choke to close all the way? It's a 5.7 engine.
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Old 07-03-2015, 09:20 PM   #22
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forget my original posted comments.... Now see this thread is 3 pages.
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Old 07-03-2015, 11:03 PM   #23
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The trim sender is on the side of the gimbal ring on the outside of the transom assembly. Either the wires are broken off of it or it's bad internally. The easiest time to replace these is when replacing the bellows as the wires penetrate in a none easy to reach place.

The choke plate should not be fully closed when set it should be about a pencil width open. There are 3 screws on the electric choke housing, loosen then to rotate it to set the choke. If you have to close the choke totally to get it to start the idle setting is probably to lean.
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Old 07-19-2015, 05:19 AM   #24
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Thanks mmwjr. I will look into it. It also might explain why I can usually get it started at my house which is a lower altitude than the lake. Am I right in assuming there's a mixture screw on the carb somewhere? Where would that be?

Thanks again for all the assistance.
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Old 07-19-2015, 10:56 AM   #25
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The mixture screws are on the front of the carb down near the base plate.

If altitude is to high at the lake the carb may need to be jetted differently. I would ask other boaters at the lake if they had to make any changes.
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Old 07-19-2015, 04:00 PM   #26
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Thanks for the info. We're going out in the boat again in a couple of weeks. I'll try it then and let you know.
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Old 07-26-2015, 08:05 PM   #27
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I got busy with family stuff and forgot to ask if others had to re-jet their carbs. I poked around in the engine compartment and looked through the Chilton manual that came with the boat and found that I have a Weber four barrel carb and, as mentioned before, the mixing screws are located up front. The manual says I should be out on the water to make adjustments to the mixture but I forgot. We'll be out on the boat again this weekend and I'll try to remember it then.
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Old 08-05-2015, 03:53 AM   #28
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I tried starting the engine again on the ear muffs with the same trouble starting. I adjusted the mixture screws about a half turn and Voila! It started right up. I let everything cool down and tried it again the next morning and it started right up again

Now, I believe my RPM's are too high or the tach is off. I just dropped the wife off to retrieve the trailer and while waiting for her, I decided to see what the boat could do. I reached 5k RPM's and thought it was a bit high. I was actually able to shoot it to 6K but dropped it right away to around 4K. After getting home and searching around I found that the WOT for my boat is between 4400 and 4800 RPM's. I called the service department of the local dealership and was told that my 17pitch prop was probably the problem and that I should have a 19 or 20pitch. I have an 18pitch Enertia prop that came with the boat so I'm going to try that next time I'm out.

The lake I mostly use is at about 5k elevation. What pitch do you guys think I need? I can't seem to find any reference for such a thing.
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Old 08-05-2015, 11:16 AM   #29
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Going up 1" of pitch should drop the WOT by about 250 rpm.

I would try mercruiser's prop calculator and see what it recommends.
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Old 08-06-2015, 01:53 AM   #30
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I tried the prop calculator on Mercury's website but it didn't give the option for a boat as old as mine so I chose the earliest which was 2000. It then didn't have the option for my gear ratio which is 1.50 so I chose the 1.47. After all that, it recommended a 17 pitch prop. So, I'm now going to hook up another tachometer so I can see if there's any discrepancies between the two. It sure didn't sound like I hit 6k RPM's but maybe I did. I'll see soon.
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