I 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?
By MikefromGA from Raleigh, NC
The gap should be around .030. Replace the air filter and give it a tune up.
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.
ThriftyFun is one of the longest running frugal living communities on the Internet. These are archives of older discussions.
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.
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.
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.
