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1# Sometimes due to a rich mixture of fuel to air ratio, which means that there is more fuel than air going to your combustion cylinders.
2# Sometimes you just have a plug that does not work well, so make sure you check all your plugs to insure that they are in good working order.
So, I just bought a brand new mower, Briggs & Stratton, and it is idling up and down. It started doing it about a week after I bought it, so I changed the spark plug and it fixed the idling problem momentarily, then started doing it again. I googled it and confirmed that my mower is suffering from a rich mixture as you speak of above.
My problem is....what can I do about that problem? Please advise me, anyone, thanks.
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∙ 13y ago
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Change a spark plug on Yamaha v star 650?
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Three possibilities: The carburetor is set to run too rich, the plug is fouled and is not get sufficient spark, or there is a leak. Start with the leak and work backward: leak, spark, carb.
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Check your spark plugs and spark plug wires. One may be bad. Do you smell gas if you turn your fresh air vent on?
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