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Donald
Donald, Small Engine Technician
Category: Small Engine
Satisfied Customers: 1799
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: 8 months ago.
Category: Small Engine
Expert:  Donald replied 8 months ago.

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

Expert:  Donald replied 8 months ago.

Is your engine a single cylinder Briggs & Stratton?

Customer: replied 8 months ago.
intek plus 540cc 21hp
Expert:  Donald replied 8 months 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 8 months ago.
Was mowing when it happened
Expert:  Donald replied 8 months ago.

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

Customer: replied 8 months ago.
How would I replace pushrod?
Expert:  Donald replied 8 months 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 8 months ago.
If rocker arm is loose would I just torque it down?
Expert:  Donald replied 8 months 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 8 months ago.
how will I find you when I check it?
Expert:  Donald replied 8 months ago.

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

Customer: replied 8 months ago.
Rockers and pushrods seem ok. Valve lash seems ok.
Customer: replied 8 months ago.
Tried starting fluid but didn't even cough.
Expert:  Donald replied 8 months 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 8 months 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!