Texasfishn

Update: For starters, thanks to everyone for the wonderful, friendly advise. As a long time view of these forums, and a first time user, I am very impressed. I got got the new diaphragm installed and just took the boat out for a test run. I took off from the ramp, no issues, I ran around for 5 minutes then hauled back towards the ramp, shut it off and dinked around a bit, fired it up and took off like a dream. Ran to the other end of the lake, fished a bit, boat took off fine. I gained a few mph, which is secondary to the motor now sounds soooo much smoother. Thanks again guys.

Yes, unfortunately, 54.7 is the fastest I’ve ever got it up to on slick water and low gear. I can’t remember if I changed the primer bulb or not. I’ve slept since then hahaha. I will check that out. Do the primer bulbs have a filter in them by chance Yes sir. I actually tried that for the first time last night when I was out, no change. I ended up having to jam lure boxes on my hot shot to hold it down and stand on the front deck to get it to nose down. NOT MY IDEA OF A GOOD IDEA!!!! Thanks aJay. I ordered a rebuild kit for my pump. The only other mechanical issue I could see being the cause (mind you I’m not an outboard expert and am asking for help for a reason) is a bad temp sensor. That would make sense to me also. Telling the motor it’s cold and not adjusting the choke.

Hmmmm that sounds expensive I keep the live wells closed because I thought that was the issue, it could be overheating, but I have put new controls in the boat and the alarm does not go off (except when gas or oil is low). I agree about the low rpms, but I have not changed the prop since owning the boat and they have always been that speed. Max speed is around 53 mph. Last compression test I did a few months weeks ago was fine. I will run another compression test in a few hours and see where that takes us. It has a 24 pitch 4 blade prop on it that has been on it forever. I am thinking about moving to a 23 pitch 3 blade, but that I feel would not fix my issue, just help my boat move with the issue. I have and changed all of the fuel lines in the past off season to black fuel hose rather than the grey, it ran amazing right after that. Thanks for all the help from everyone.

-New lower unit, not damaged at all. -WOT RPM around 5300. -Trim works great. -I am beginning to think a diaphragm in my fuel pump could be causing this issue. Letting excessive amounts of fuel by after the fuel system is pressured from cranking. After my first run, or If I stop and graph I can’t get above 7 mph to take off. Occasionally, if I catch a wave right it will get back up on pad, but it just bogs really bad. First run is always great, comes out of the hole, hits top speed and runs like a dream, it’s just after it’s run or idled a time, it acts up.

I have a 1991 mercury 200 efi, on a 20’ skeeter. The boat will get up and get on pad no problem on the initial take off. Stop and fish for a bit, go to leave, it may get on pad it may not. Most of the times it will not, especially if I have to idle for any time before jumping on it. No excessive water or weight in the boat, motor runs fine, but this is getting old!