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 Rick Your Own Question

Rick
Rick, Small Engine Technician
Category: Small Engine
Satisfied Customers: 3844
Experience:  Outdoor Power Equipment technical trainer since 1990, covering eight states.
20444326
Type Your Small Engine Question Here...
Rick is online now

I have a McCulloch 300EX lawn tractor with a 22hp &S engine

Customer Question

I have a McCulloch 300EX lawn tractor with a 22hp B&S engine model 91P677 type 0804-B1 code(###) ###-####D
It will start but refuses to keep running now and for some time (since it had a short block exchange done) has been backfiring when you stop the engine. It is reluctant to start on full throttle - prefers to start with just a little throttle - runs for 15-20 secs then stops. Initially it did not want to start at all. The carburettor seems clean and I'm not sure its at all a fuel problem. Could the timing be flawed since they changed the block? Apart from the backfire it was starting and running fine until last weekend. Stopped to have a cuppa and then it would not start.
Regards,
Bob B.
Submitted: 1 year ago.
Category: Small Engine
Expert:  Curtis B. replied 1 year ago.
31P677? single cylinder Briggs engine. I the carburetor is an electric solenoid, it serves as anti-backfire solenoid. It plugs the main jet when it is relaxed. Sounds like it is not working correctly. It requires 12 volts as soon as the key is turned on and has to stay open for engine to continue to run. Do you have 12 volts to it as soon as key is on? Does it retract fully when it retracts? Should click open as soon as key is turned. It can cause hard start, kill engine if it relaxes, and cause backfiring when key is shutoff!

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
< 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
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C.
  • 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
  • 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
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin
  • 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
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C.
 
 
 

Meet The Experts:

 
 
 
  • Jon K.

    Jon K.

    Small engine diagnostic expert

    Satisfied Customers:

    2823
    Gold certified Stihl tech, Service Manager for a rental/repair shop.Certified in most small engines
< Last | Next >
  • http://ww2.justanswer.com/uploads/jonrk/2010-1-5_22551_jon.jpg Jon K.'s Avatar

    Jon K.

    Small engine diagnostic expert

    Satisfied Customers:

    2823
    Gold certified Stihl tech, Service Manager for a rental/repair shop.Certified in most small engines
  • http://ww2.justanswer.com/uploads/KO/koboma/2012-6-6_20917_DSCF1022.64x64.JPG Curtis B.'s Avatar

    Curtis B.

    Technician

    Satisfied Customers:

    162
    Service manager and technician for all brands of engines with 40 + years of experience.
  • http://ww2.justanswer.com/uploads/HA/HankF/2013-8-27_12514_JAProfilepic.64x64.JPG Hank F.'s Avatar

    Hank F.

    Technician

    Satisfied Customers:

    5359
    Certified on Onan and Generac generators.
  • http://ww2.justanswer.com/uploads/RA/ranwell1/2013-5-23_17421_2fixed3.5x5.64x64.jpg ranwell1's Avatar

    ranwell1

    Small Engine Technician

    Satisfied Customers:

    5039
    Owner of Large Small engine repair business. Over 39 years. Certified both 2-cycle and 4-cycle engines
  • http://ww2.justanswer.com/uploads/SP/spankyjr1/2014-1-16_16395_Leha002.64x64.jpg spankyjr1's Avatar

    spankyjr1

    Small Engine Technician

    Satisfied Customers:

    19
    Journeyman TechnicianWorked on small to large engines for 30 yearsGas,LP,Diesel
  • http://ww2.justanswer.com/uploads/PL/Plumberpro/2014-6-23_6520_image.64x64.jpg Plumberpro's Avatar

    Plumberpro

    Plumber

    Satisfied Customers:

    40
    Fully qualified plumbing , heating and gas engineer 20 years experience
 
 
 

Related Small Engine Questions