SimonSaysSaws
ArboristSite Lurker
Hello Everyone,
I have recently purchased a used a Stihl O38 AV Super. The top end appears to be in excellent shape, the piston and cylinder look excellent on inspection and the compression is about 155 psi cold. The previous owner had problems with the fuel system and carburetor so that is the focus of things here right now.
I have replaced the fuel line and the fuel pickup/filter, spark plug and thoroughly washed out the fuel tank. The carburetor is a Tillotson Hk-29a. The impulse line connects to it flush on piston-face of the carburetor. I bought a carb kit (Tillotson RK-32-HK) from my local Stihl dealer. After thorough cleaning of the carb I re-assembled using the new gaskets and needle in the kit. When I put it back together and tried to start it, I did get a few sputters and fires but mostly it was heavily flooded. I think that I didn't get the needle/seat re-installed correctly so I am now in carb tear-down round two.
I am a little baffled right now with what was supplied in the carb kit.
I have recently purchased a used a Stihl O38 AV Super. The top end appears to be in excellent shape, the piston and cylinder look excellent on inspection and the compression is about 155 psi cold. The previous owner had problems with the fuel system and carburetor so that is the focus of things here right now.
I have replaced the fuel line and the fuel pickup/filter, spark plug and thoroughly washed out the fuel tank. The carburetor is a Tillotson Hk-29a. The impulse line connects to it flush on piston-face of the carburetor. I bought a carb kit (Tillotson RK-32-HK) from my local Stihl dealer. After thorough cleaning of the carb I re-assembled using the new gaskets and needle in the kit. When I put it back together and tried to start it, I did get a few sputters and fires but mostly it was heavily flooded. I think that I didn't get the needle/seat re-installed correctly so I am now in carb tear-down round two.
I am a little baffled right now with what was supplied in the carb kit.
- First there is what appears to be a gasket that goes between the carb and the air filter (first picture), however the inner diameter of the gasket is smaller than the diameter of the carb (by a ~2mm). Has anyone experienced this? Do I just widen the gasket somehow to match the carb inner diameter? Do I even need that gasket?
- Second, there appears to a redundant gasket that goes on the diaphragm side of the carb. Second pic, right hand side. The one on the left is identical to what came out of the carb. Is the right one truly redundant or perhaps for a slightly different carb version? Or do I just stack the two together? Or leave it out?
- If I can't get this carb set up, does anyone know a suitable replacement carb for this saw? My neighbour said there is a zama carb maybe?