Briggs & Stratton

WONT START
Experienced gardeners share their insights in answering this question :
Try new spark plug, fresh fuel, and new air filter.If you have hit something with the blade it may well have sheared the flywheel key knocking the ignition timing out.

How to Identify and Fix Common Gardening Problems ?

We provide a variety of viewpoints on how to identify and fix common gardening problems. Our sources include academic articles, blog posts, and personal essays from experienced gardeners :

Disconnected, dirty or fouled spark plugs are common causes for engines that won`t start. For small engines, spark plugs typically need to be replaced every season or after 25 hours of use. You should also check to make sure the spark plug gap is set correctly.
If your Briggs & Stratton engine has a spark but won`t run, then it is most likely a problem with the gas or air intake in the engine. The spark on the spark plug ignites the gas in the piston, but if the air filter is clogged or the gas can`t flow, then the engine won`t start.
You Lose Power in the Middle of Mowing:

Here`s why this happens and what you can do: Dirty Air Filter on Your Lawn Mower: Clean or replace. Dirty Spark Plug: Clean or replace. Build Up of Clippings & Debris: Clean underside of your lawn mower deck as noted above.

A Dirty Carburetor Can Cause a Lawnmower To Start Then Die

By far, the most common issue that causes a stalled motor is a dirty carburetor. The carburetor on your engine is the thing that draws in air and mixes it with the fuel. Contrary to what the movies might make you think, gasoline itself is not very flammable.

Bad or dead battery

The most common reason cars don`t start is a dead or faulty battery. Even though most cars run on gasoline, they all require electrical power to function. The starter that cranks your engine to start requires an electrical signal to fire.

If the ignition coil does not have spark, it`s time to check its wires. Use a test light to check the continuity on the signal wire and power wire on the ignition coil. If both wires are functional but the coil fails to produce spark, the ignition coil or the ignition control module is bad.
If it won`t start or fire with spray fuel, you probably have an ignition system problem, most likely a bad ignition coil. However, if it starts and dies, that proves the ignition is working and the problem is fuel starvation. Check the fuel filter first by disconnecting the fuel line from the filter to the carb.
A dirty carburetor is one of the most common causes for a lawn mower not being able to start after sitting unused for months or years at a time.
A full gas tank and oil reservoir are the essential first steps when checking why the lawn mower won`t stay running, but the problem could also be a dirty filter, clogged carburetor, improper fuel mixture, or a dirty spark plug.
Your lawn mower turning over but not starting due to several reasons, such as a faulty or disconnected plug, a disconnected spark plug wire, a clogged air filter, or a contaminated fuel tank. A faulty carburetor, a dirty cutting deck, or a dysfunctional flywheel brake can also cause this.
A dirty carburetor is one of the most common causes for a lawn mower not being able to start after sitting unused for months or years at a time.
The most common cause of a mower that runs for thirty minutes and then dies is a faulty armature. A faulty gas cap is the second most likely cause.
A dirty carburetor is one of the most common causes for a lawn mower not being able to start after sitting unused for months or years at a time.
A: Possible causes: a marginal battery, a poor connection in the starting circuit or starter, a charging-system problem, or the battery is being drained while the car`s parked. If this only happens first thing in the morning, a weak battery or a drain in the electrical system are likely causes.

Discover Relevant Questions and Answers for Your Specific Issue

the most relevant questions and answers related to your specific issue

Engine will not run but a few minutes at a time
ANSWER : Check your spark plugs, see if they are failing, if they are then your motor is getting to hot. meaning that you either have the fuel mixture set to high or the setting on the spark plugs are not correct causing you to burn hot.Please rate

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2010 model 20 hp Briggs motor. Fuel going through fuel line, but not going into carberator. Motor runs good for about 15 min, but after heating up this fuel problem starts. After cooling down for an hour it will run again for about 15 min.\r\nThanks for any advice
Tom in AR
ANSWER : Two things:
1 Is fuel coming out of the fuel line. Older mowers have old fuel lines and they tend to get weak and collapse went they warm up with engine heat. Replace the old fuel line.
2 deposits in the carb. take off the air cleaner, start it up and spray a good carb cleaner in the carb until the engine dies. Put some ‘seafoam’ in the gas and a little in the oil and put the air cleaner back on and start the mower and mow on FULL THROTTLE. this should claen out the carb. Yes the mower will run rough for awhile.

these two cheap fixes will solve 85 % of carb problems. GOOD LUCK

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Oil is fine, runs fine for about 10 minutes then bogs down and dies. Let it sit for 10 minutes it will start again and run fine for another 10 minutes. Used to be 20 minutes, then 15. The cooler the weather the longer it runs. Is there some electrical component that may be getting weak? 17.5 hp Briggs. Air cooled. Air filters have been changed but didn’t help. Plug wire?About 5 yrs old. Help – It’s taking six hours to mow………..
ANSWER : It could easily be an electrical issue, or not. Get a spark tester (hooks up to the spark plug). Pep boys, Autozone, and Napa all sell them for less than $10. Check for spark when the mower has quit. If no spark, most likely need to replace the ignition module. Also check the flywheel key, if it is has been sheared or even knicked, the engine will run hot.If you still have spark when engine has failed, check the vent on the gas cap. A clogged vent will cause a vacuum to form in the tank and stall the engine.Good luck!

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42′ Poulan 20 hp-I was mowing & there was a loud pop,mower ideled down & quit. It will turn over but won’t start.
ANSWER : Check compression, should be over 90psi to start. And check spark. The loud pop I am going to assume came from the exhaust, which if you lost spark would cause excess gas to ignite. Causes of no spark, bad coil, or defective and or damaged safty swith.

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My Craftsman Lawn Tractor 18 HP Briggs and Stratton runs about 10-15 minutes and then stalls. Will restart after a cool down period, any ideas?
ANSWER : I had the same problem and talked to 3 different techs. The only solution they would come up with is to replace the carb. I didnt believe this was the problem. If you have a fuel solenoid on the bottom of the float bowl remove it and just put in a float bowl plug that threads in. I just taped up the solenoid connector. It runs better than it ever did. I believe the solenoid gets hot and starts shutting off the fuel. I used a plug from a spare set of 1977 yamaha motorcycle carbs I had sitting around.Go figure. Hope this works

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Can i replace a 17.5 hp mower engine with a 18 hp engine?
ANSWER : You will need to shop carefully. That is not too much of a power jump to worry about ruining axles, gears and the like. BUT, do be mindful that you have to shop an engine to match two very important criteria:Bolt patterns and spacing: This is how the engine will attach to the mower’s deck/chasis.Output shaft length, diameter, taper and if it’s keyed or non-keyed.If looking to just replace a tired old iron horse, similar make and model to the original with slight power upgrade cannot be helped – but the bolts and shafts will be pretty much spot on.

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Will only run with the choke half on – Briggs & Stratton Lawn-Boy 10640 20-Inch 6.5 HP Gas Powered Lawn Mower
ANSWER : The carb is blocked. Remove the barb take out the main jet blow out the holes and make sure they are 100% spotless rebulid clean out your filliter and that should sort your probleml davidson lawn mower tech

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How do I remove and clean air filter? – Briggs & Stratton Lawn-Boy 10640 20-Inch 6.5 HP Gas Powered Lawn Mower
ANSWER : There should be a square of plastic on the side of the engine which is opposite of the muffler. It has a small hex head with a slot cut in it. Remove this plastic cover and the air cleaner should be inside of it.

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