What are the common reasons why lawn mowers won't start?

g-man57 said:
I like to work on small engine 'stuff'. It's fun and rewarding to make then run again. If something turns over, has compression, but will not start, you can buy them dirt cheap. I fix them and give them away. The last one I worked on was a Weed Eater brand with a 4.5hp Tecumseh engine. It was the nicest 'trim' mower ever. So light - no problem working around stuff. I gave it to an 80 yo woman who insists on doing the trimming at her home. Her husband rides around on his big JD. LOL

big snip
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When servicing engines for elderly people go to a multi grade oil
The difference between the effort needed to pull an engine with strait 30 against 5 or 10 W 30 is staggering
Fixwd a few "won't starts" by just changing oil
 
bertsmobile1 said:
When servicing engines for elderly people go to a multi grade oil
The difference between the effort needed to pull an engine with strait 30 against 5 or 10 W 30 is staggering
Fixwd a few "won't starts" by just changing oil
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Never thought about that......Came into this world in March...37.....1937.

Prefer to be addressed as ....Mature
 
Hipa Jeremy said:
Carbs? Spark plugs? Fuel systems? Need more suggestions! Please!
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I’ve found that the carburetor is the most common issue at the shop but after that ignition, whether it’s the plug or the coil.

The FASTTEC method changed my repair life tremendously, Matt from Schrodinger’s Box on YouTube is great. He’s adamant on diagnosing fully before buying parts and ruling everything else out before you assume it’s a certain part.

Video link and definition of acronym below 😁



Fuel
Air
Spark
Timing (engine)
Timing (ignition)
Exhaust
Compression
 
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