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Donald, Small Engine Technician
Category: Small Engine
Satisfied Customers: 2086
Experience:  I have 25+ years of experience repairing 2 & 4 cycle engines
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Backfired loudly - stopped - cranks but won't even try to

Customer Question

backfired loudly - stopped - cranks but won't even try to start
JA: Thanks. Can you give me any more details about your issue?
Customer: everything (fuel,plug,spark) ok
JA: OK got it. Last thing — Technicians generally expect a deposit of about $18 to help with your type of question (you only pay if satisfied). Now I'm going to take you to a page to place a secure deposit with JustAnswer. Don't worry, this chat is saved. After that, we will finish helping you.
Submitted: 1 year ago.
Category: Small Engine
Expert:  Donald replied 1 year ago.

Hello, and thank you for choosing Just Answer. My name is***** our problem occur suddenly, as you were out mowing?

Expert:  Donald replied 1 year ago.

Is your engine a single cylinder Briggs & Stratton?

Customer: replied 1 year ago.
intek plus 540cc 21hp
Expert:  Donald replied 1 year ago.

Thanks for this information. There is a possibility that you have either a loose rocker arm, or a bent/broken push rod. To confirm this, you will need to remove your OHV valve cover, and check the movement of your valves. The cover is held in place with four bolts, that requires either a 3/8" socket, or wrench for removal.

Customer: replied 1 year ago.
Was mowing when it happened
Expert:  Donald replied 1 year ago.

When you have an opportunity, I would like for you to check this ...

Customer: replied 1 year ago.
How would I replace pushrod?
Expert:  Donald replied 1 year ago.

This will be a good starting point for you and me. It is not very difficult. If the push rod is our actual problem, I can instruct you on how to replace it.

Customer: replied 1 year ago.
If rocker arm is loose would I just torque it down?
Expert:  Donald replied 1 year ago.

If it is loose, you will need to reset your valve before you torque it down. After you confirm our problem, I can get you a video link, or specific instructions.

Customer: replied 1 year ago.
how will I find you when I check it?
Expert:  Donald replied 1 year ago.

Just type a message into our discussion page, and I will get an alert indicating that you are back.

Customer: replied 1 year ago.
Rockers and pushrods seem ok. Valve lash seems ok.
Customer: replied 1 year ago.
Tried starting fluid but didn't even cough.
Expert:  Donald replied 1 year ago.

Thank you for checking. Did you check your valve lash with a feeler gauge? If not, try using a feeler gauge. Your setting should be:

  • Exhaust Valve (upper valve) - .005" - .007"
  • Intake Valve (lower valve) - .003" - .005"
Expert:  Donald replied 1 year ago.

Also, check to see if you are getting spark to your spark plug. Or, try a new spark plug. We can continue from here. Thanks!