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How Do I Change the Carburetor on a Ryobi Trimmer?
How Do I Change the Carburetor on a Ryobi Trimmer?. Ryobi trimmers can have either a Walbro or Zama carburetor. While both are connected to the engine similarly, they are constructed slightly different. After removing the carburetor, inspect it for its identification number, and either Walbro or Zama written on the carburetor. If you're planning on...
Ryobi trimmers can have either a Walbro or Zama carburetor. While both are connected to the engine similarly, they are constructed slightly different. After removing the carburetor, inspect it for its identification number, and either Walbro or Zama written on the carburetor. If you're planning on rebuilding the carburetor, you should obtain the appropriate parts diagram and service manual for your Walbro or Zama carburetor. Use the identification number to order any replacement parts.
Accessing the Carburetor
The carburetor is sandwiched between the air filter and the crankcase, and to the side of the fuel tank. To reach the carburetor, go in through the air filter side and not the starter side. You should also take this time to remove and clean the air filter. The carburetor is held in place by two screws and washers, which are located above and below where the air filter sits on the engine.
Removing the Carburetor
Before removing the carburetor, use a toothbrush and rag to wipe down any dirt or grass clippings around the cover plate. After removing the mountings screws and washers, pull off the choke lever and cover plate. To get the carburetor off, remove the throttle assembly.
When you pull out the carburetor, pull it off with the gasket. Unscrew the carburetor's mounting assembly to check the reed valve, which is located behind the carburetor. Carefully inspect all of the parts for any damage and soak them in a carburetor cleaner bath.
Reassembling the Carburetor
Use either the Walbro or Zama carburetor parts diagrams to help you put the carburetor back together. Make sure that the gaskets are sealed and the carburetor can hold positive pressure in the diaphragm. Also make sure the reed valve and its rubber tip are correctly engaging the metering arm in the diaphragm. Inspect all of the filters as these can get gummed up from old or bad gas, and if the trimmer has been improperly stored with fuel still in the carburetor. It is also recommended to install a carburetor kit if it's getting old or having lots of problems.
