How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask PK. Your Own Question

PK.
PK., Small Engine Technician
Category: Small Engine
Satisfied Customers: 1038
Experience:  Retired Owner of a full service shop and national parts sales website.
12056261
Type Your Small Engine Question Here...
PK. is online now
A new question is answered every 9 seconds

I have a Craftsman 18 40cc Chainsaw about two years old.

Resolved Question:

I have a Craftsman 18" 40cc Chainsaw about two years old. It starts fine when cold but once warmed up, and it stalls or I shut it off, it will not re-start until I let it cool all the way back down to "cold start". once running I have to keep the trigger squeezed until I'm done as, it will stall once I release the trigger. I have tried to adjust the Idle speed screw, and, of course, the mixture is set at the factory. I have changed the sparkplug and air cleaner with no results, fuel is fine. I have noticed when removeing the cover to check sparkplug, that a sharp edge on the cover has worn through the Plug wire insulation and you can see the white silicone under the black insulation...but it is not worn all the way through. I was thinking of ordering a new ignition module to replace the plug wire.
Submitted: 4 years ago.
Category: Small Engine
Expert:  PK. replied 4 years ago.

I think you may be running too lean because of a stopped up carburetor. The plug wire, you can tape up with electrical tape, this is pretty common on some of these saws.

 

The part number for the carburetor isNNN-NN-NNNNand is available from any Poulan dealer. I have it listed at about $22 and that's about average. Poulan makes this saw for Sears. You can use any of the part numbers from Sears and save a little money by buying from a Poulan dealer.

 

I don't bother rebuilding these carburetors as for the price, it just doesn't make any sense. You'll spend about the same on a carb kit and cleaner as a new carburetor with none of the fuss of rebuilding.

 

It's very, very important to not run lean in a chainsaw. The carburetors are already adjusted lean from the factory to meet EPA standards so leaning out a little more will result in too little oil reaching the engine and in overheating.

 

Your symptoms could also indicate a vacuum leak from the carburetor seal or even a crank seal. But without the proper tools and block-off plates, you can't check these things. I would feel pretty comfortable in replacing the carburetor myself.

 

Let me know if you have any questions. Thanks, PK.

 

PK., Small Engine Technician
Category: Small Engine
Satisfied Customers: 1038
Experience: Retired Owner of a full service shop and national parts sales website.
PK. and other Small Engine Specialists are ready to help you
Customer: replied 4 years ago.
I was leaning towards the carburator too. just wasn't sure once I saw the worn wire. Have not dissassembled it far enough yet to check for a possible loose screw on the carburator mount. Do you have a website so I can order a carb from you?
Customer: replied 4 years ago.
I "googled" your shop name as listed in your info and found the website and placed order. I felt you took the time to provide answer that sounds like a good probability, I may as well buy the part from you. Thanks

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
< Last | Next >
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • Curtis B.

    Technician

    Satisfied Customers:

    6989
    have worked on and around most engine models for 35 yrs./Polaris ATV expert
< Last | Next >
  • http://ww2.justanswer.com/uploads/KO/koboma/2012-6-6_20917_DSCF1022.64x64.JPG Curtis B.'s Avatar

    Curtis B.

    Technician

    Satisfied Customers:

    6989
    have worked on and around most engine models for 35 yrs./Polaris ATV expert
  • http://ww2.justanswer.com/uploads/SM/SmEngPro/2012-8-5_3564_Rick1206290005Edit.fullres.logo.scrn.64x64.jpg Rick's Avatar

    Rick

    Factory Authorized Trainer

    Satisfied Customers:

    4126
    Outdoor Power Equipment technical trainer since 1990, covering eight states.
  • http://ww2.justanswer.com/uploads/GI/giftindex/2011-11-19_2715_JamesLWells500.64x64.jpg James W's Avatar

    James W

    Small Engine Troubleshooting Expert

    Satisfied Customers:

    2978
    7 years as Mechanic & Parts Manager for Brother who has Owned Lawn & Garden Repair shop for 35 years
  • http://ww2.justanswer.com/uploads/jonrk/2010-1-5_22551_jon.jpg Jon K.'s Avatar

    Jon K.

    Small Engine Diagnostic Expert

    Satisfied Customers:

    2950
    Gold certified Stihl tech, Service Manager for a rental/repair shop.Certified in most small engines
  • http://ww2.justanswer.com/uploads/MR/mr2cycle/2011-3-12_03458_sears.64x64.jpg Vince O.'s Avatar

    Vince O.

    Small Engine Technician

    Satisfied Customers:

    2374
    Over 30 years experience repairing lawn and garden equipment. Chainsaws, mowers,blowers and trimmers
  • http://ww2.justanswer.com/uploads/rheisnger/2010-12-31_010856_41385_100001225699183_7012_q.jpg RUSS's Avatar

    RUSS

    SERVICE TECHNICIAN

    Satisfied Customers:

    1723
    28 YEAR SERVICE TECHNICIAN
  • http://ww2.justanswer.com/uploads/BriggsEngines/2010-02-26_230200_n1834842973_4823.jpg CJBennett's Avatar

    CJBennett

    Small Engine Technician

    Satisfied Customers:

    623
    Briggs and Stratton Master Service Tech, Kohler, Tecumseh, Kawasaki certified. 18 years exp.