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Why does my Briggs&Stratton lawnmower start, run, then die?
I have had this mower(4.5HP) for years and never had any serious problems with it, until a couple weeks ago. It starts up, runs perfectly for 30 sec-2 min. then just quits. If I press the primer to start the mower it recovers, but then quits again shortly after. I thought it was a clog in my carb. or fuel line, so i cleaned all that stuff out, flushed the tank, new air filter-the works-but today it ran a bit longer but ended up doing the same thing and quit on me. I was sure it was some kind of problem getting gas to the carb since the primer gets it to recover, but Im pretty sure I cleaned just about everything I can before getting into the piston. I checked/cleaned the spark plug and it had some grey buildup on it, but that made no difference. Im at a loss here, and I know it can run since it gives me a good half minute before dying. I dont really want to completely dismantle it but unless someone has an idea, my weekend will be full of little bitty motor parts. Please help!!!
8 Answers
- renpenLv 71 decade ago
As stated this engine has a diaphram type carburetor. You need to remove it. The best way is to remove the gas tank with the carb on it and than remove the carb. You can get a rebuild kit for at $12 at a small engine shop. While you have it apart make sure the tank is clean and that all passages in the carb are also. There is a fine mesh screen on the end of the pick up tube, make sure it is clean. Be sure to take note of how the springs and rods connect to the carb before you take it apart.
- R P ALv 51 decade ago
It must be a fuel system problem. If I remember correctly most Briggs carbs have a thin rubber diaphragm inside. If this is damaged or gunked up it won't suck gas from the tank. I think a carb rebuild kit will fix your problem.
Briggs has parts manuals online for many models.
Source(s): http://www.briggsandstratton.com/ - 1 decade ago
I have a Briggs & Stratton that does the EXACT same thing. I have replaced the spark plug, and also checked & filled the oil. And the EXACT thing happens. I am going to go ahead and spend the money to find out what it is I guess. It has been a great mower for 5 years up until this incident. Thanks for posting this :)
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- Anonymous1 decade ago
Get a new spark plug your old one is getting hot and quitting.
next is the points and condenser under the balancinng ring/magneto head. Try the spark plug first. If that dont do it then replace the condenser,trying NOT to budge the points setting. or if you are a brave then just yank everything out and replace the points and condenser. Make sure to properly gap the points or it will not run.Try the new plug first,thats the cheapest thing.and you can do the labor.
- Anonymous1 decade ago
My recommendation is to take it to a local shop that handles mowers. Rather than spending the time yourself "taking it apart", they can often find it may be a dirty carb and can fix it for 40 bucks or so. They specialize in it, and the time saved outweighs the money.
- 1 decade ago
the most common problem is the fuel needle valve is plugged the engine will run as long as you are priming it--{you are spraying gas directly into carb} most needle valves have have a very small hole in the side easy to overlook, clean it with a very small sewing needle, hope this helps
