How to adjust the Ryobi carburettor

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Ryobi Ltd is technically complex aluminium casting products for the automotive industry. In the UK, they are based at Carrickfergus in Northern Ireland. The company also makes tools including the petrol-driven Line Trimmer and this is where you are most likely to encounter a Ryobi carburettor. If you have problems with your Ryobi-made carburettor you can get in touch with a local service centre (see Resources) or have a go at fixing the problem yourself.

Low engine idle speed

Start the engine as you normally would, allowing time for it to warm up.

Release the throttle trigger, if the engine stalls, the idle is set too low.

Locate the choke dial. It will be installed on the side of the engine nearest the primer bulb. Immediately to the left of the choke dial base are the choke settings. Midway between the "Half Choke" and "Run" labels, you will see a small round access hole.

Insert your screwdriver through the access hole and onto the idle adjustment screw.

Turn the screw in a clockwise direction approximately 1/8 turn. Restart the engine. If the idle speed has increased sufficiently to prevent the engine from stalling, you are finished. If not, repeat the process until you can release the throttle trigger and the engine continues to run.

High engine idle speed

Start the engine as you normally would, allowing time for it to warm up.

Release the throttle trigger. If the engine whines or races, the idle is set too high. Shut the engine off.

Locate the choke dial. It will be installed on the side of the engine nearest the primer bulb. Immediately to the left of the choke dial base are the choke settings. Midway between the "Half Choke" and "Run" labels, you will see a small round access hole.

Insert your screwdriver through the access hole and onto the idle adjustment screw.

Turn the screw in a counterclockwise direction approximately 1/8 turn. Restart the engine. If it no longer races, you are finished. If not, repeat the process until you can release the throttle trigger and the engine idles smoothly without whining.

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