Stihl Carburetor Parts
Stihl, at first had their own carburetors’ then when new models and sales increase Walbro and Zama were used. Nothing wrong with any of them, none were “better” than the other.
There are numbers etched on the side of the carbs which tells us the model and application, application is the key word here. For example a chainsaw sold in Florida uses the same carburetor model as one sold in Alaska but because of location…. the jetting is slightly different, and so are the choke ports.
Once you run your instrument of husbandry the carb is wet and it has to remain so during its equipments life span. This discourages the pump diagram and valves from drying out and to prevent the cavities of the carb open to air pockets. I would highly suggest buying the pre-mix fuel in the gal/qt containers and running the equipment to help circulate it thought-out the fuel system, especially for storage.
I have seen many saws come into the shop with the mixture screws way out of whack. The low speed screw is pretty much adjusted the way car is adjusted, but a touch on the rich side. The high speed screw is the one that is the most messed with, and can cause premature wear and failure. The high speed has two purposes, one it limits the rpm of the engine and the other allows running rich at full throttle under load. Adjustment can be made by running full throttle and turning the high adjust screw out/in until it starts to “double stroke”. This method is also used on radio controlled fliers.
And by the way, Stihl is the best and a close second Echo, and then the rest …….lol
Stihl, at first had their own carburetors’ then when new models and sales increase Walbro and Zama were used. Nothing wrong with any of them, none were “better” than the other.
There are numbers etched on the side of the carbs which tells us the model and application, application is the key word here. For example a chainsaw sold in Florida uses the same carburetor model as one sold in Alaska but because of location…. the jetting is slightly different, and so are the choke ports.
Once you run your instrument of husbandry the carb is wet and it has to remain so during its equipments life span. This discourages the pump diagram and valves from drying out and to prevent the cavities of the carb open to air pockets. I would highly suggest buying the pre-mix fuel in the gal/qt containers and running the equipment to help circulate it thought-out the fuel system, especially for storage.
I have seen many saws come into the shop with the mixture screws way out of whack. The low speed screw is pretty much adjusted the way car is adjusted, but a touch on the rich side. The high speed screw is the one that is the most messed with, and can cause premature wear and failure. The high speed has two purposes, one it limits the rpm of the engine and the other allows running rich at full throttle under load. Adjustment can be made by running full throttle and turning the high adjust screw out/in until it starts to “double stroke”. This method is also used on radio controlled fliers.
And by the way, Stihl is the best and a close second Echo, and then the rest …….lol
