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B+S Engine Trouble?

When I turn the key the B+G 12.5hp engine (lawn tractor) turns and then sticks. The starter is new. Is the next potential suspect battery or solenoid?

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Bronze Post Medal for 2021. 31 Posts
July 1, 20210 found this helpful
Best Answer

If your lawn mower starts, runs briefly, then dies these are the four most common reasons that’s happening:

1. Loose carburetor
A loose carburetor will not let your engine function well because there will be an insufficient flow and atomization of gas due to unstable attachment of the carburetor. Check the carburetor first if it is fixed firmly before determining other problems.

2. Dirty carburetor or clogged carburetor bowl
Your engine needs a steady flow of gasoline to run correctly. The carburetor is responsible for mixing gas with just the right amount of oxygen to create combustion. This combustion supplies a continuous rotation of the crankshaft that is necessary to run the mower's engine. If your carburetor is dirty or the carburetor bowl is clogged, the process above is compromised, and your engine may start up, but it will not run properly - turns and then sticks.

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Unscrew the carburetor bowl and give it a once over with the cleaner - blowout your dirty carburetor with an aerosol of carburetor cleaner. Be sure to clean the screw and hole with the carburetor cleaner as well. When reattaching the bowl, don’t over-tighten the screw. This could strip the threads enough to distort the seal.

3. Old gasoline in your mower
If the gas in your mower has been sitting inactive for a while, evaporation has most likely created a damaging residue. This residue leaves particles that clog your mower's internal parts and the end result is restricted gas flow - your mower can start and die shortly thereafter. Sometimes, your mower won’t start at all.
If your mower tank is less than half full of old gas, you might try adding new gas to dilute the impurities. If the old gas is more than half of a tank, it would be best to siphon it out and fill the tank with fresh gasoline.

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Adding a stabilizer prevent the clogging residue for up to two years. Always read the directions to know the proper fuel to stabilizer ratio for your mower.

4. Dirty or defective spark plugs
Spark plugs supply the “spark” that ignites the air / fuel mixture in your engine. If they are dirty or faulty, they will not spark, and your mower will not start, or may start and then quickly die.
If your spark plugs are not too heavily coated with build-up, you can try cleaning them. You should never clean a spark plug with a shot-blasting cleaner. A wire brush and appropriate cleaner will do the trick if the plug is just dirty. However, if your mower's spark plug looks filthy or appears to have a dark carbon residue, you might be better off replacing.
Spark plugs should be replaced every year or two.
Replacing a spark plug can be a bit more challenging for a first-timer, but it is an easy job. If you have never done this before, there are several videos online that can be of great assistance

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5. Blocked gasoline cap
If this hole gets blocked, this can create a vacuum inside the tank and there will be a disruption of the gas moving downward into the carburetor.
Clean the hole in the cap with a thin wire or if the cap is already beaten up, replace it with a new one.

6. Too much oil in your resevoir
If your carburetor is clean and the spark plugs are firing, the problem might be too much oil. If a lot of smoke is coming out, your mower might be running, but not for long. In this case, the excess oil will eventually drown out the engine and cause it to die.
You just need to drain some. Use a dipstick to measure the amount of oil in the reservoir before removing it, and then again after to make sure you get the right level. Not enough oil is another (and more serious) problem.

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7. Worn-out carburetor
If your lawnmower has served you for years and undergone many repairs, the carburetor will be the first one that must be replaced followed by other replaceable parts.

8. Clogged air filter.
Replace the filter.

If your problem still is not fixed, then call a professional.

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Gold Post Medal for All Time! 677 Posts
June 14, 20210 found this helpful

It looks like the spark plug is the next thing to check www.briggsandstratton.com/.../top-5-mower-troubleshooting-tips...

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