Walbro WYL Carburetor Repair And Service
Walbro WYL Carburetor Manual and Parts List for the correct identification, repair and service of the WYL series carburetor found in trimmers and blowers. View free online images or download the full Walbro WYL Carburetor Manual PDF which can be printed or saved on any suitable device. Clear diagrams and information to help in parts ordering or repair of this Walbro WYL series carburetor. Identify all component parts of the Walbro carburetor.
Walbro WYL Carburetor Manual
The Walbro model number is stamped on the body of the carburetor.
WALBRO WYL AT START POSITION (PURGE)
Some WYL carburetors have as an option, a purge system. This purge system allows the customer to purge the metering chamber of air and replace rt with fuel for easier starting.
WALBRO WYL STARTING PROCEDURE
By depressing the purge bulb, air is forced through the umbrella check valve. This air passes through the pump body and out the overflow tube. When the bulb is released, the umbrella check valve is drawn closed. An orifice bypassing the check valve allows fuel to be drawn up from the fuel tank, through the carburetor fuel pump, metering chamber and into the primer bulb. Once the primer bulb is at least 1/4 filled with fuel, the engine is ready for the choke operation and start.
WYL AT IDLE POSITION
The WYL carburetor has two idle adjustment design options. Option 1 allows for the inner idle needle to be adjusted and a white plastic cap placed on top to hide the needle. Option 2 is with the same inner idle needle but also has a black idle screw located above the needle for a fine tune adjustment. Please read the following instructions for correct adjustment of the WYL at the idle position.
WALBRO WYL IDLE ADJUSTMENT PROCEDURE (WYL WITH PLASTIC PLUG)
1. Remove the plastic plug located directly above the inner idle needle.
2, Using a 2.5mm wide flathead screwdriver, turn out the inner idle needle until threads disengage.
3. Turn inner idle needle clockwise 10-12 turns very slowly.
4. Start engine.
5. With the engine in the idle position, continue turning the inner idle needle clockwise. The idle RPM should increase (lean) until the peak lean idle RPM is obtained.
Turn inner idle needle counterclockwise (rich) until optimum idle is obtained.
Please note that carburetors and engine applications will vary, therefore the needle setting may vary also.
6. Adjust the idle speed screw to the correct idle RPM.
Check idle, progression and wide open throttle, shut off engine.
7. Reinstall the while plastic plug.
WALBRO WYL IDLE ADJUSTMENT PROCEDURE (WYL WITH IDLE SCREW)
1. Start engine and place throttle in the idle position.
2. The black idle needle is preset to a 1 turn open setting. Adjust this needle to a good optimum idle setting.
3. Repeat step 6, and shut off engine.
NOTE: Do not attempt to adjust the inner idle needle. It is glued into place and should not be moved.
WALBRO WYL AT WIDE OPEN THROTTLE POSITION
With the WYL at the wide open throttle position, the throttle lever will be at the highest side of the ramp. This will allow the idle needle to be pulled away from the nozzle outlet and allow enough fuel to be fed to the engine at W.O.T. The barrel will be fully open allowing as much air as permitted to enter from the choke side and flow into the engine.
Fuel at the wide open throttle position enters the nozzle thru a pressed in main jet. This main jet is selected by Walbro Engineering to match the performance of the engine. Based on your altitude or performance requirements, you may have to replace the jet with an appropriate sized jet.
Walbro WYL Carburetor Manual and Parts List Diagrams
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