Monday, June 2, 2014

MTD Yard Machines 31cc String Trimmer -- Carburetor Removal


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I would have cited the model number in the title of this post, but the subject machine is a "RECON" unit with model number "ZR766R" on it. MTD doesn't recognize that model number; I have no idea what the original, proper MTD model number is. The engine end of the machine looks like this.


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You'll need a T20 Torx driver. Proceed as follows:

1) Shroud w/Air Filter Element
- Choke lever at 1/2 choke position.
- Four No. 10 x 3/4" pan head screws.
- Pull the shroud straight off over the choke lever.
- NOTE how the air filter element resides in the shroud.

The above step gets you to here.


2) Tubing
NOTE the two tubes:
- Upper tube is from the primer bulb.
- Lower tube is from the fuel tank.
- Slip the two tubes off their nipples.

3) Choke Plate
NOTE the wavy washer under the upper screw's head.
- Two No. 10 x 2" pan head screws w/captive washers.

The above step gets you to here.


4) Carburetor w/Gasket
- Disconnect the throttle cable, and the carburetor is free to come away from the engine. Its gasket will likely be stuck to it.

Here's a view of the carburetor off the engine.


This carburetor is a Walbro WT-682. If you're off to the small engine parts place for a diaphragm kit, my advice is to take the carburetor with you.

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