Turning the fuel adjustment screws all the way in (clockwise) until they barely seat and then turning them out (anticlockwise) by a certain amount, usually one full turn, are common procedures for resetting a tiny two-stroke chainsaw carburetor to its factory settings. These factory settings serve as a starting point for further modifications. Here is a thorough, step-by-step instruction:
Tools and Materials You'll Need:
Small screwdriver or carburetor adjustment tool
Safety glasses and gloves
Owner's manual (if available)
Procedure:
Safety precautions: Before you start, make sure the spark plug is disconnected, the chainsaw is off, and you're wearing the proper protective gear, such as gloves and safety glasses.
Finding the Adjuster Screws: Locate the carburetor's fuel adjustment screws. These are normally found on the side of the carburetor body and are referred to as the "L" (low-speed) and "H" (high-speed) screws. For safety, they could have plastic coverings or caps.
Find Factory Settings: It's important to be aware of the factory settings that the chainsaw's maker suggests. These settings can differ based on the brand and model of the chainsaw, so consult your owner's handbook or the manufacturer's documentation to find out what they should be.
Initial Adjustment - Clockwise Seating: Begin by lightly seating or bottoming out the "L" and "H" screws by clockwise (inward) rotating each of them. When doing this, use caution to prevent harm to the screws or carburetor. The "closed" position is the default setting.
After lightly seating the screws, give each one a complete anticlockwise (outward) turn before backing off. For further fine-tuning, this one-turn anticlockwise adjustment serves as a starting point.
Put on your safety gear and start the chainsaw after reconnecting the spark plug. So that it reaches its operational temperature, give it some time to warm up.
Low-Speed Adjustment (L Screw): Slowly and incrementally crank the "L" screw anticlockwise (outward) while the chainsaw is operating. As you listen to the engine, keep an eye on the chain to see how it moves. The objective is to locate the point where the engine operates without hesitating or stalling. The ideal low-speed setting is indicated by this.
After making the necessary low-speed adjustments, run the engine to full throttle and slowly spin the "H" screw anticlockwise (outward) in tiny increments. The goal is to achieve error-free, fast functioning without too much smoke.
Final Check: After making these modifications, run the chainsaw for a few minutes at full speed and idle to make sure it maintains stability and doesn't stall. To fine-tune the settings, make any little tweaks that are required.
Verify with Factory Settings: Compare your adjustments to the factory settings if you have access to them in your owner's handbook. If there is a sizable difference, modify further as necessary to comply with the manufacturer's instructions.
Lock the Adjuster Screws: Once you're happy with the settings, you can mark the screw positions with a little bit of thread-locking compound or paint to prevent unintended change.
Remember that these are only general instructions for returning a two-stroke chainsaw carburetor to its original default settings. Consult the owner's manual for your chainsaw for exact factory settings. To guarantee optimum performance and safety, consult a qualified chainsaw mechanic if you have questions about carburetor adjustments.
I hope you have gained something from this video.
Thank you
Craig Kirkman (Owner and Creator of The Repair Specialist Channel)
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