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 J.R. Your Own Question
J.R., Small Engine Technician
Category: Small Engine
Satisfied Customers: 7445
Experience:  Owner of outdoor power equipment business, repairing all makes and models.
Type Your Small Engine Question Here...
J.R. is online now
A new question is answered every 9 seconds

I have a year 2000 Craftsman riding mower. Model No. 917.271050.

Customer Question

I have a year 2000 Craftsman riding mower. Model No.NNN-NN-NNNN Power plant is the single cylinder 15.5HP Kohler Engine (CV-15) with a Walbro LMK Carb.

I have been trying to get it to run properly for a few days now.

Symptoms: Tractor will start fully choked but die when choke is opened....however...if I drop the throttle bar from fully choked all the way to idle it will remain idling quietly with no issue.....the other symptom worth mentioning is that while fully choked I can stuff a rag in the air intake in an attempt to snuff out the motor and it will continue to run...suggesting its getting air from somewhere else?

I have performed the following maintenance to try and correct my issue:

- fresh oil change to 10w30 Castrol (synthetic)
- new plug Champion RC12YC
- New Kohler brand air filter and pre-cleaner
- new kohler fuel filter
- new kohler oil filter
- new fuel shut off solenoid
- new battery

I have pulled the carb and hit the inlet pickup with carb cleaner and can see the carb cleaner coming out of the sprayer...looks fine? Regardless the carb is bathing in a carb dunk tank as I type this. I ordered a new carb rebuild kit this morning (so it will have fresh gaskets) and got some fresh fuel line to try as well. I also plan on trying brand new high octane fuel (I may have mixed old and new fuel...I don't recall).

Would appreciate it any input to help get this mower working properly. If these final upgrades fail...I suppose my next purchase is a new carb?
Submitted: 6 years ago.
Category: Small Engine
Expert:  J.R. replied 6 years ago.
I think the problem is in the carburetor. Let me know what you find once you have it back together and we will go from there. The carb is the first place to start.
Customer: replied 6 years ago.

I agree the carb is the first place to start...but I'm not ready to rule out other culprits. With respect to the carb....if it idles well (as my tractor does) I'm guessing I really just need to concentrate on the main jet as this is what seems to be not working correctly (although I can watch carb cleaner spray out the main without issue).


I'm letting the carb soak for 2 hours, hitting it with carb cleaner then compressed air...then repeating this process. I plan on doing this for much of the next 24 hours. If I'm gonna clean this bad boy I need to know I did a thorough clean so I can potentially rule the carb out soon.


Any other tips of the trade you can share to help bring this mower back to life?

Expert:  J.R. replied 6 years ago.
The only other thing you may want to check is the valves. With it running with the choke On, but not off still says that it is a carb problem. Let me know.

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... seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like
...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
< Previous | 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.

    Curtis B.


    Satisfied Customers:

    have worked on and around most engine models for 35 yrs./Polaris ATV expert
< Last | Next >
  • Curtis B.'s Avatar

    Curtis B.


    Satisfied Customers:

    have worked on and around most engine models for 35 yrs./Polaris ATV expert
  • Rick's Avatar


    Factory Authorized Trainer

    Satisfied Customers:

    Outdoor Power Equipment technical trainer since 1990, covering eight states.
  • Jon K.'s Avatar

    Jon K.

    Small Engine Diagnostic Expert

    Satisfied Customers:

    Gold certified Stihl tech, Service Manager for a rental/repair shop.Certified in most small engines
  • James W's Avatar

    James W

    Small Engine Troubleshooting Expert

    Satisfied Customers:

    7 years as Mechanic & Parts Manager for Brother who has Owned Lawn & Garden Repair shop for 35 years
  • Vince O.'s Avatar

    Vince O.

    Small Engine Technician

    Satisfied Customers:

    Over 30 years experience repairing lawn and garden equipment. Chainsaws, mowers,blowers and trimmers
  • RUSS's Avatar



    Satisfied Customers:

  • Wayne's Avatar


    Engine Rebuilder

    Satisfied Customers:

    many years on egine rebuilding, lawn mower,roto tiller,Truck,and small engines