Re: sportwin won't make full power
Look at that high speed orifice in this way: it provides the control on the quantity of fuel where you are having a problem. The fuel moves up from there to the top of the carburetor, then down through the reeds to the combustion chambers.
The fuel pump keeps the float bowl full, but the movement of the pistons actually pulls the fuel through the reeds.
To clean the high speed capillary and the jet without a complete carburetor rebuild, you could force carburetor cleaner through the jet from the bottom by using the pipe that normally comes with the Gumout inserted tightly against the jet.
Then, if you look carefully at the base of the choke bowl on the top of the carburetor, you will discover a small hole facing from the starboard that leads back to the high speed jet in the other direction. If you insert your Gumout pipe there and blow the cleaner in that direction, you will have cleared any major obstruction.
You can then replace the float bowl drain plug and test.
If that gives even modest improvement, I would rebuild the carb.
I know that everyone would like to see an easy solution to the problem that you have. The bottom line is that the compression test is one of the finest diagnostic tools.
Look at that high speed orifice in this way: it provides the control on the quantity of fuel where you are having a problem. The fuel moves up from there to the top of the carburetor, then down through the reeds to the combustion chambers.
The fuel pump keeps the float bowl full, but the movement of the pistons actually pulls the fuel through the reeds.
To clean the high speed capillary and the jet without a complete carburetor rebuild, you could force carburetor cleaner through the jet from the bottom by using the pipe that normally comes with the Gumout inserted tightly against the jet.
Then, if you look carefully at the base of the choke bowl on the top of the carburetor, you will discover a small hole facing from the starboard that leads back to the high speed jet in the other direction. If you insert your Gumout pipe there and blow the cleaner in that direction, you will have cleared any major obstruction.
You can then replace the float bowl drain plug and test.
If that gives even modest improvement, I would rebuild the carb.
I know that everyone would like to see an easy solution to the problem that you have. The bottom line is that the compression test is one of the finest diagnostic tools.