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weedeater wont stay idling,dies when throttling up.

my craftman 2cycl gas eater starts up but can not throttle up it will die. 1 cleaned carb and air filter.2have fresh ly mixed gas. spark plug looks good. weedeater is only 3yrs old. i am at a loss what to try next.

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15 Answers from these members:
Joseph Perez
I know how important it is to have a good working trimmer in the home so that you can keep your lawn nice and trimmed. While you are waiting for your expert answer, I suggest you add to the thread of this question and include the full model number of your appliance so that the expert can provide you with a more detailed answer. I did manage to find a link that will provide you with some good tips. I hope my link is useful.
by Joseph Perez Earned 1,607 community points in Lawn Mowers
June 30th, 2011
Answered in 12 minutes
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Sam A
Thank you for your question.

I can understand your dilemma with the engine dying.

It sounds like the low speed idle screw is set two lean and that's why it stumbles and die's when you throttle up.

The problem is it requires a special adjustment tool to adjust the needle mix screws on the carburetor.

If you can turn the low speed screw about a 1/8 turn counterclockwise it should correct this problem.

If that does not fix the problem you will need to rebuild the carburetor. (Carb kit)

If you will reply with the model number of you trimmer I will be happy to help you further.

Thank you for using Manage My Life.
by Sam A Earned 749 community points in Lawn Mowers
July 1st, 2011
Answered in 15 hours
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Manage My Life
thank you so much.since my posting i have pulled off the carb and cleaned a already clean carb. i dont think the carb needs rebuilt at this time.i agree the low speed screw needs adjusted. i dont have the special tool to adjust the low speed screw. problem is what is the name of this tool,and how or where can i get one??
by Manage My Life
July 3rd, 2011
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Sam A
Thank you for the update.
I cannot see which carburetor adjustment tool you need because there are about 4 different pattern styles, depending on who made the carburetor. If you look at the link below you may be able to identify which one you need.


Sam A.
by Sam A Earned 749 community points in Lawn Mowers
July 5th, 2011
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Manage My Life
sam
thank you for your help so far. i wasnt able to give you the model or serial number of my 2cycl craftman trimmer because the one tag was not readable. looking again at the trimmer i found another tag that gave me the info. SERIAL NUM: 05185N400315 MODEL3581050. i went to the website you gave me and found a 4 set piece carb adjustment tool set i am thinking of buying because the pics are not clear enough to see which one i need. what do you think?
by Manage My Life
July 8th, 2011
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Sam A
Thank you for the update. Yes, if you have found the adjustment drivers then go ahead and get them fi they are not to expensive.

Sam A
by Sam A Earned 749 community points in Lawn Mowers
July 8th, 2011
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Manage My Life
error in model numbers model 358791050 i wonder do i need all four of these tools one should be enough??
by Manage My Life
July 8th, 2011
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Sam A
Thank you for the update. If you can figure out which one you need I would only purchase one if you only have one machine to do the adjustments on.

Sam A.
by Sam A Earned 749 community points in Lawn Mowers
July 11th, 2011
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Manage My Life
What does the H and L screw heads look like? Most craftsman will with use the Spline (cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=280704860550&hlp=false) or the Single D (cgi.ebay.com/HOMELITE-POULAN-WALBRO-CARB-ADJUSTING-TOOL-SINGLE-D-/120733905051?pt=LH_DefaultDomain_0&hash=item1c1c4d309b#ht_2426wt_1037). The double D has two flat sides instead of just one
by Manage My Life
July 15th, 2011
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Manage My Life
my craftman 2cyc weed eater model 358791050. serial 06135n. starts but dies on throttle up. information i got from the experts on this site that my slow idle might be a little lead and i need a special adjustment tool to adjust the slow idle. i finally bought the adjustment tool but has taken a month to finally address this problem again. problem i have looking into the carb is finding the slow idle adjustment. if i could downlowd a simple pic of the carb showing the idle adjust i can solve this problem.
by Manage My Life
August 9th, 2011
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Manage My Life
Looking at the carb you should see two screws at the bottom, more than likely they will be spline on this carb. The one on the left, closest to the motor is the slow idle adjustment screw.

Looking at the picture below, the bottom part of that carb there is a metal piece that extends past the rest of the carb and then the piece is slightly bent up. That is where the two adjustment screws are.
by Manage My Life
August 9th, 2011
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Sam A
Hello Tom! The carburetor you have is a Walbro model CIU-W19 and it has both a low and high adjustment screw. Usually the one the left is the low speed adjustment.
If you want to start from scratch with the adjustments, screw both adjustment screws in or closed but not to tight. (Gently) and then back out two full turns of the screws as a starting point.

The idle adjustment screw is located on the throttle plate stop, and after you get the engine to throttle up correctly and run at high speed correctly then you can adjust the idle screw so it will sit alone and idle just slow enough to not make the clutch turn.
If this trimmer has some working hours on it I would suggest cleaning the muffler screens and exhaust port of any carbon deposits.

You will need to take the muffler off to do this.

I am sorry but I do not have a picture of this carburetor to send you.

I hope this information will help.

Sam A.
by Sam A Earned 749 community points in Lawn Mowers
August 9th, 2011
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Manage My Life
actually let me help out here..as I have been repairing/rebuilding these small engines for 35+ years, the only one that will be happy is the company that sells you the tool..... do NOT buy the screw drivers, a simple solution is there , use a short piece of drip tube water system tube 1/4 inch 3 inchs long works great and slips over the spline head screws no matter what one they are , it locks tight enough to move all brands of screws in and out to ajust them...

I am surprise that the "experts " here did not know that.....guess being in the trade for 35 plus years makes up for their lack of expertise.
by Manage My Life
August 27th, 2012
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Sam A
Thank you Anonymous for your suggestions for the josh to use a piece of drip tube to slip over the ends of the adjustment screws. My concern will they know what your are referring to when you say a piece of drip tubing.

There are a lot substitutes for doing this adjustment but whether they have access to such things is quite another issue. As a technician you get creative if you do not have the correct tool.
I have to be careful not to stray to far away from using the right tool for the job when advising consumers.

Thank you for your contribution I am sure it will be helpful to the consumer.

Sam A,
by Sam A Earned 749 community points in Lawn Mowers
August 28th, 2012
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Wayne Parrish
Didn't address model 358-791590
by Wayne Parrish
September 4th, 2014
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