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 Curtis B. Your Own Question
Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 28325
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
Type Your Small Engine Question Here...
Curtis B. is online now
A new question is answered every 9 seconds

Have &s 24 hp,modelg5, has 60 hrs on it,2 years old on sears

Customer Question

have b&s 24 hp,model(###) ###-####g5, has 60 hrs on it,2 years old on sears lawn tractor,engine has always run very lean,engine now starts miss and backfire through exhaust .upon removing plugs one is black the other is clean, if i replace plugs will run fine for about 4 hours and then starts again to backfire. our altitude is 3600 feet, any ideas ?. thanks
Submitted: 11 months ago.
Category: Small Engine
Expert:  Curtis B. replied 11 months ago.

Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!

Expert:  Curtis B. replied 11 months ago.

Cylinder with the black look has weak spark or the valves need to be checked. Or the carburetor, has a leaking jet in it. This carburetor has to jets, one for each cylinder. See the link below.

Expert:  Curtis B. replied 10 months ago.

I see question is still open, did you find problem?