Dumb carburetor question, need help please

[kspakland]

I made the mistake of loaning my 039 to a friend, and even though his intentions were good to maintain it, he screwed up and didn't seat the air filter properly and the carb got polluted with dust.
He took the carb apart and cleaned it, three times I believe because the saw never ran right again.
I suspect he may have got a gasket or diaphragm in wrong, and I don't know which order they are supposed to go.
I got a Stihl carb kit, and hope I can get the saw running good again.
The pic shows the two gaskets/diaphragms in question.
I know the other side of the carb gets the gasket with the big hole first, then the diaphragm thingy against the cover.

 

[Bob Hedgecutter]

 

[kspakland]

THANK YOU !!!
The "clear" one goes on first.
I guarantee this time, it will be assembled correctly and hopefully run right.
I just hope he didn't mess with the mixture screws, as they were set perfectly.

 

[Bob Hedgecutter]

Picture is easier than typing out an explanation
But if you think it has been eating dust, it would pay to check out the screen in the hole below the main needle valve- #31 in the above diagram, that filters the fuel coming into the carb before it goes through the metering system and will often clog with fine debris or even gum up with fuel deposits.

 

[BigDee]

Even if the mixture screws were set perfectly before the carb rebuild, you will need to retune to know that the mix is right for the new conditions in the carb.

 

[cscltd]

FYI- if the air filter was not seated properly, it can’t really effect anything inside the carb (diaphragms etc) as dirt would go straight through Venturi and that dirt would damage the piston.