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.
J.R., Small Engine Technician
Category: Small Engine
Satisfied Customers: 7444
Experience:  Owner of outdoor power equipment business, repairing all makes and models.
13636126
Type Your Small Engine Question Here...
J.R. is online now
A new question is answered every 9 seconds

Good Morning, I have a 1997 MTD Yard Machines Limited Edition

Resolved Question:

Good Morning,

I have a 1997 MTD Yard Machines Limited Edition riding lawn mower. It has a Briggs and Stratton 18.5 HP engine with a Aisan carburetor. The B&S Model number is: 303777. The Type is: 1032-A1 1880. The Code is 96112211.

The carb sits on the side of the manifold instead of on the top like most carbs do.
My problem is that the engine runs great as long as the air cleaner is removed. As soon as the air cleaner is installed the engine loads up and starts missing and smoking. As soon as the air is removed it clears right up and runs great again. It has this condition at idle or at fast idle and seems to load up about the same in either throttle position.

I used my LED light to check for light coming through the filter and it has good light all the way around. The B&S part number matches as to what it should be. Can this type of carb be so sensitive to dirt in air filter that it can look good but still cause this problem?

Thanks,
Al
Submitted: 5 years ago.
Category: Small Engine
Expert:  J.R. replied 5 years ago.
The problem is most likely a plugged up jet in the carb, not an air filter problem. Pull the carb off and give it a good cleaning.
Customer: replied 5 years ago.
Hi J.R.

I pulled the carb off and completely disasembled it. Then I sprayed cleaner through all of the passages to make sure it came out of the other ends. The I blew through the passages both ways if possible. I did the same thing with the main jet, idle jet, emulsion tube etc.
I also check to make sure all the little holes werent pluged in them.

Thanks,
Al
Expert:  J.R. replied 5 years ago.
If you feel that the carb is clean, then I would replace the air filter. The filter may be dirty enough that it is affecting the air/fuel mixture. Does it have a green pre filter on it?
Customer: replied 5 years ago.
It does have a green pre filter on it but the engine runs the same with or without the pre filter on the air cleaner.
Expert:  J.R. replied 5 years ago.
Change the air cleaner and see if that does not fix it.
J.R., Small Engine Technician
Category: Small Engine
Satisfied Customers: 7444
Experience: Owner of outdoor power equipment business, repairing all makes and models.
J.R. and 3 other Small Engine Specialists are ready to help you
Customer: replied 5 years ago.
I will do that and let you know if it fixes the problem.
Expert:  J.R. replied 5 years ago.
Let me know and we will continue if needed.

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.