Question about Oregon Scientific Complete Carburetor for Stihl 4122 Brush Cutter and 4226HS Hedge Trimmer

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Primer not pumping mm55 stihl yard boss - Oregon Scientific Complete Carburetor for Stihl 4122 Brush Cutter and 4226HS Hedge Trimmer

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Your Stihl dealer should have a parts department where you can get a new primer bulb. Also check the fuel lines to make sure they haven't cracked or come off.

Posted on Apr 27, 2010


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Stihl 028 wood boss av carb wont prime

Remove the primer plate, you will see small orifice on side opposite the bulb, blow compressed air through this toeard bulb side. This is check valve that becomes plugged quite often. Now blow all other orifices gently to prevent damage.

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Could be adjustment if it has a fuel adjustment screw or maybe it needs the carburettor cleaning out.

Was any original fuel drained and replaced with fresh fuel?

If there are any diaphragms in the carb they could have perished in those 2 years or become hard and inflexible.

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First remove the module and clean the mounting areas to be sure the module has a good ground. Leave the ground wire off the module and run the unit. If it runs fine then you will have to kill the motor by pulling the spark plug or choking it down. If it runs fine reattach the ground wire and run again. If ran good without wire but not with then the switch is bad. If wont run good either way then likely a module.

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try switching the tubes on the back of the primer bulb

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generally you have 1 line from the tank that has a fuel filter attached to it that goes to the inlet port on the carb, 1 line from the carb to the primer bulb, and 1 line from the primer bulb back to the tank. when you press the primer it draws fuel through the carb and returns it to the tank through the primer bulb

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1 Answer

Stihl vent

Try replacing the tank vent, The vent acts as a 1 way valve allowing air into the tank to balance the atmos pressure. Does the carb also have a primer pump on it.? Sometimes faulty primer pumps can cause the tank to pressurise. You haven't stated the model otherwise i could have been a bit more accurate with the diagnosis. :)

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