If your Bolens lawn mower is smoking, especially if it is blowing black smoke, the engine is almost always running rich because the carburetor is letting in too much fuel. The most likely cause is a stuck carburetor float that stays open and floods the engine, followed by a choke that is stuck closed and limits the air needed for the right fuel-air mix. In many cases, a worn or dirty carburetor is the root of the problem, and a carburetor repair kit can help restore proper operation if the internal parts are damaged or sticking. This kind of lawn mower engine smoking problem usually points to the fuel system first, not the ignition system, so checking the carburetor before replacing other small engine parts can save time. If your mower running rich continues to produce smoke after inspection, replacing the carburetor may be the most reliable fix. Enter your Bolens model number on RepairClinic.com to find the exact carburetor or carburetor repair kit that fits your specific lawn mower.
01 - Carburetor is Letting Too Much Fuel In
If the lawn mower engine produces black smoke, this indicates that the carburetor is getting too much fuel (or "running rich"). If the carburetor float is stuck open, the engine will get too much fuel. Similarly, if the carburetor choke is stuck closed, the lawn mower engine will not be able to draw in enough air to create the proper air-fuel mixture.
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02 - Bolens Lawn Mower Carburetor
If the lawn mower engine produces black smoke, this indicates that the carburetor is getting too much fuel (or "running rich"). If the carburetor float is stuck open, the engine will get too much fuel. Similarly, if the carburetor choke is stuck closed, the lawn mower engine will not be able to draw in enough air to create the proper air-fuel mixture.
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If the lawn mower engine produces black smoke, this indicates that the carburetor is getting too much fuel (or "running rich"). If the carburetor float is stuck open, the engine will get too much fuel. Similarly, if the carburetor choke is stuck closed, the lawn mower engine will not be able to draw in enough air to create the proper air-fuel mixture.