wcsd106
Petty Officer 2nd Class
- Joined
- Mar 27, 2010
- Messages
- 182
Hello All,
Last summer I rebuilt all three carburetors on my 1984 Mercury 200HP V6 outboard. After reinstalling the carbs and synchronizing the timing and carbs per the OEM Shop Manual for my engine, I noticed that my WOT RPM was low. A description of the problem is listed below:
Here are the testing procedures I have done so far:
A local marine mechanic told me today that he believes it is a fuel related issue and that possibly there was some miniscule piece of trash still in one of the carburetor passages when it was cleaned and rebuilt. He recommended that I try Starbrite Star Tron additive during my next tank of fuel.
Today I drained the old fuel and removed the water separating filter. I will be fueling up with new fuel tomorrow along with the Star Tron additive. A new water separating filter will be installed at the same time.
I am hoping the weather will allow for a test run tomorrow so that I can report any changes.
Any ideas as to what else it could be would be greatly appreciated. For instance, is it time to break out my DVA meter and check the stator and trigger again?
Thank You for any help you may be able to provide.
Last summer I rebuilt all three carburetors on my 1984 Mercury 200HP V6 outboard. After reinstalling the carbs and synchronizing the timing and carbs per the OEM Shop Manual for my engine, I noticed that my WOT RPM was low. A description of the problem is listed below:
- Outboard starts and idles without much difficulty
- Outboard will rev into the mid/high 5000 rpm range i.e. 5500 or so during the hole shot
- Once on plane, the outboard seems to lack power and will only achieve around 4400-4800 rpm on plane
Here are the testing procedures I have done so far:
- Checked for spark on all 6 cylinders (While Idling)
- Checked and rechecked that the carburetor butterflies are opening completely at WOT
- Checked spark plugs, wires, etc for cracks or damage
- Verified WOT timing at 23.5 degrees (Measured at cranking speed)
A local marine mechanic told me today that he believes it is a fuel related issue and that possibly there was some miniscule piece of trash still in one of the carburetor passages when it was cleaned and rebuilt. He recommended that I try Starbrite Star Tron additive during my next tank of fuel.
Today I drained the old fuel and removed the water separating filter. I will be fueling up with new fuel tomorrow along with the Star Tron additive. A new water separating filter will be installed at the same time.
I am hoping the weather will allow for a test run tomorrow so that I can report any changes.
Any ideas as to what else it could be would be greatly appreciated. For instance, is it time to break out my DVA meter and check the stator and trigger again?
Thank You for any help you may be able to provide.