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About P.K. Jones
Expertise
I can answer most questions about commercial and residential outdoor equipment. I can also help with questions about import atv's, Karts and scooters. I can't help you with generator electrical output however if it's an engine problem, I'm more than happy to help. I'm in the South, so snowblowers and snowmobiles are outside of my area of knowledge. If it's a question about the engine on a snowblower I can help. But I'm just not familiar with the drive systems for snowblowers.

Experience
I own Grand Junction Small Engines and Grandjunctionsmallengines.com, a full service shop and national parts sales site. My shop is an Authorized Repair Center for many brands and we work on equipment from most manufacturers. We are also a dealer and service center for several lines of outdoor sports products such as atv's, utv's and Karts. Personally, I have over 25 years experience working with small engines and outdoor power equipment.

Education/Credentials
I've attended many small engine and power equipment factory schools and seminars. I average 100 plus hours annually in update schools and specialized training schools and am current on all brands my shop is authorized to do warranty and factory service on.

 
   

You are here:  Experts > Home/Garden > Home Appliances > Small Engines (Lawn Mowers, etc.) > Lawn mower won't start, but backfires

Small Engines (Lawn Mowers, etc.) - Lawn mower won't start, but backfires


Expert: P.K. Jones - 6/29/2009

Question
I have a Brigs and Stratton lawn mower that is probably 8 or 9 years old.  If I try to start it, it backfires and won't start.  We just replaced the gas line because we thought it was the issue; however, the lawn mower is acting the same after that.  As far as I know I have not hit anything.  Got any idea?  We have replace the spark plug, checked the filter as well as replaced the gas.

Answer
The first thought is usually to see if the flywheel has moved.  If you pull the covers off the flywheel and the retaining nut, see if the flywheel key is still in place and that the keyways line up.

After that I'd need to know if it's backfiring through the carburetor or exhaust.  

Through the carb might be a very lean fuel air mix or a stuck valve.  Through the exhaust usually means a stuck valve if the engine won't run and the flywheel hasn't moved.

Check the flywheel and let me know where it's backfiring through.  Thanks, PK.

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