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Fixing a Briggs and Stratton Lawn Mower

September 12, 2010

Lawn MowerI just bought a used lawnmower with a 4.5 Hp Briggs and Stratton engine. It doesn't really run properly. It starts fine, but then runs sporadically. The plug is the one that came with it and I can't find the proper gap or right plug specification. It's almost like there is a carburetor issue as it idles up and down. What can I do about it?

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By MikefromGA from Raleigh, NC

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September 15, 20100 found this helpful
Best Answer

The gap should be around .030. Replace the air filter and give it a tune up.

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June 15, 2018

This is a page about diagnosing a mower with a Briggs and Stratton engine that won't start. Before you take your mower to a repair shop, here are some possibilities to look into. Diagnosing the issue yourself can save you time and money, so its worth a try.

Red lawn mower on fresh cut grass.

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ThriftyFun is one of the longest running frugal living communities on the Internet. These are archives of older discussions.

September 12, 2010

My Briggs and Stratton Weedeater push mower is not starting. It seems to not get any spark and I have a new spark plug, new gas, and oil.

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November 13, 2009

I have a 4.5 Hp Briggs and Stratton Engine on my lawn mower. It's only 2 years old, but has never really run properly. It starts fine, but then runs sporadically.

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May 3, 2010

I have 17.5 Briggs and Stratton. I hit something while mowing the lawn and now when you start the engine oil mixed with gas pours into the carburetor.

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Home and Garden Repair Machines Lawn MowersAugust 18, 2017
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