I have a Stihl TS420 Zama C1Q-S118 carburetor, that I cannot figure out where the fuel feed for the idle adjustment needle is.
There is an idle circuit brass orifice (jet) with a check valve, which is needed in order for the remote purge primer to work. Beneath the idle jet, there is a hole drilled to feed fuel to the chamber containing the idle bleeds beneath the welch plug.
The idle speed mixture screw hole comes in the side of the idle bleed chamber, but I have drilled through several places to try to discover the feed hole. There is a tiny hole that goes to the area behind the needle, but it's got a plug in it.
Any help would be appreciated.
There is an idle circuit brass orifice (jet) with a check valve, which is needed in order for the remote purge primer to work. Beneath the idle jet, there is a hole drilled to feed fuel to the chamber containing the idle bleeds beneath the welch plug.
The idle speed mixture screw hole comes in the side of the idle bleed chamber, but I have drilled through several places to try to discover the feed hole. There is a tiny hole that goes to the area behind the needle, but it's got a plug in it.
Any help would be appreciated.