What are the symbals for full andhalf choke on a McCulloch trimmaac strimmer

You can probably find a Youtube demonstration video.

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What is the correct fuel mixture for McCulloch products Chainsaw Trimmer...
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Agnes take of the cutting head again and see if it runs at full speed without it. If it does you have either put the head on too tight or it's the wrong head.

Joseph check the air filter isn't blocked. Also make sure the choke isn't engaged.

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Carburetor needs replacement. Possibly primer bulb assembly as well.

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What is the correct fuel mixture for McCulloch products Chainsaw Trimmer...
McCulloch Service
McCULLOCH PARTS ACCESSORIES

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remove the muffler and run it the mufflers plug up and restrick the exhaust some mufflers you can open and clean the screen

Because your carburetor is out of adjustment and/or needs to be replaced.

You may contact the manufacturer, download manuals, check fuel/oil ratios, order parts, find your local service center, and view other resources using these links:

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User manuals
What is the correct fuel mixture for McCulloch products Chainsaw Trimmer...
McCulloch Service
McCULLOCH PARTS ACCESSORIES

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Start procedure, switch the ignition switch on, press the primer bulb as many times as it takes to 3/4 fill the bulb, put the choke to the full position,hold the throttle trigger open, crank the engine until it fires once, move the choke to the centre position, crank the engine until it fires up and runs, once warm move the choke to the open position.

Check the fuel filter, air cleaner, and muffler for plugging. Check the condition of the fuel lines. Make sure the choke is operating properly. Be sure to use a synthetic chain saw oil in the fuel, not boat motor oil. I'm assuming that the jet screws have not been adjusted in an attempt to fix the problem. Hope this helps!

Hi sounds like it could need a diaphram kit in the carby if it has mixture screws one markedl for low speed and one marked h for high speed you can try winding out the low speed screw a bit but if that does not work it will definatly need a kit.