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I have a craftsman 2-cycle 17 in /.095 dia line string trimmer model:71-79105. The engine fires up and runs but once warmed up it doesn't have power when you accelerate the throttle. It only seems to have an idle adjustment screw, How do you adjust the high speed mixture like the older models ? The manual also says to use synthetic 2 cycle oil with a 50/1 mix.  Is it crucial to use synthetic oil or can you use TC-W3 grade 2 cycle oil using the same 50/1 mix ?  Any help would be greatful.  Thanks !

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6ya6ya
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Posted on Jan 02, 2017

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hunter19_46m
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SOURCE: My craftsman gas weed trimmer runs but lacks power...

Hi Edward,
Sounds like you will need to clean your carburetor.
Sometimes you can get by with priming it a few times, and letting it
run a few times like that and it will flush the gunk out of the jets,but most of the time you will need to rebuild the carburetor.
If the mower is over a couple years old, then I also recommend that you buy and install a new carburetor repair kit, because the diaphragm will get hard and that will cause it to be hard to crank.
When you clean your carburetor and remove the jet screws, count the number of turns it takes to seat the jets from their original position.
That way when you go to put the jets back in, you know how many turns they were in/out.
Please do not forget to rate me, Thanks
Good Luck, I hope this helped

Posted on May 25, 2010

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SOURCE: How do you adjust the high speed mixture screw? I

Hi montex124, I will try to help. In the past few years carb makers have been making changes. Some carbs have no adjustment at all, the ports are all fixed inside the carb. Other carbs have only the idle speed mixture screw that can be adjusted, like yours seems to have. Is this screw you mention at the top and completely outside of the carb to adjust the throttle? If it is it's probably the idle speed screw which can be adjusted to any idle speed you want and has nothing to do with the air fuel mixture but If it is right next to the idle mixture screw, it might be the high speed mixture screw but is capped so it can't be adjusted. The low and high speed mixture screws should be marked next to each screw H and L.
The 1 1/2 turns suggested is sometimes just right but other times has to be adjusted, so you can try adjusting it to get your idle but maybe adjust the idle speed screw first to get a higher RPM so it doesn't stall on you. Like I said earlier it just adjusts the throttle, and is like when you are using it, and giving it gas as they say. I hope this helps just a bit. Regards and good luck. Get back to me if you need more help or just let me know how you did. Denis.

Posted on Feb 28, 2011

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