Engine bog on 200 EFI trouble

[geno368]

I have a 2001 Mercury 3.0 200 EFI. I am running a 18 1/2 ft Skeeter ZX180 with this motor and a jack plate with a 27p Tempest plus and when I first try to run it in the mornings, I am having trouble with it bogging. This problem is present in all temps. I have to idle out to the river channel from my boathouse about 500 yards and it idles fine. When I gun it, the tach shows about 2100 and it stays that way for about 1/2 mile and then, all of a sudden, it takes off fine. The rest of the day it does great. I have had a buddy to pump the bulb and it doesn't help.
I have pulled the plugs and they are nearly new and look fine. It is a newly installed long block, so I am sure the compression is fine. Anybody got a clue??? Thanks in advance

[half fast]

If the prop has removable vent plugs ,take some or all out and then try it.They do make a huge difference. hf...

[geno368]

thanks for the reply...
I will try that, but why would it run great after the initial blast-off if that was the problem?????

[Hydrasports205]

I had an old 150 that had a very similar problem. It would idle great, but when you'd try to get it on plane it would lug and lug when it was cold then all of a sudden take off like a bat out of hell, once it warmed up everything was good. I chased the problem for a long time and it ended up being the stator.

[geno368]

Thanks for the help...was that 150 EFI? Also, does my motor have one of these stators? Also, is there a way to check it?

[Hydrasports205]

Your motor has a stator and there are tests for them....if you do a search you'll probably find the test procedure in a previous tech discussion post. Diagnosing some of the ignition system problems can be tricky especially if it's intermittent. Good luck!

The engine wasn't an EFI, but the motors basically share the same ignition components and can have similar gremlins.

If you can't find the procedure I might be able to find one for your motor in one of my shop manuals...let me know.

[perfmarine1]

Check the trigger and make sure it is advancing, sometimes with powerhead swap the wire is tied to tite and will not allow it to move.

[Hydrasports205]

Check the trigger and make sure it is advancing, sometimes with powerhead swap the wire is tied to tite and will not allow it to move.

A trigger that won't move can cause lack of power, BUT you won't EVER get full power.

[perfmarine1]

If trigger was just sticky it would cause just that,and so easy to check!

[ridgerunner]

Your motor may not have a mechanically advancing trigger. Your original post said it was a 3.0 liter 200. My 3.0L 250EFI did something similar. It would break up around 2000 RPM. If you could get past 2400RPM it would take off but it was laying down on top even after getting past the dead zone. A simple test with the ohm meter confirmed the bad stator. Not a bad repair on the 250EFI. My 250 has a fuel and ignition computer and a flying magnet type sensor on the flywheel for reference. Not sure if yours is the same or not. I have a manual if you would like me to check.

[geno368]

I was incorrect..it is a 2.5..do you have access to a manual for this?
Thanks
Update I had a racer to install a tester ecu off a 225 and we briefly ran it in 40 deg and windy weather and the bogging did not happen. Of course the 225 ecu probably ran the mixture much richer...Now I think maybe it is the ecu