Motor starts but runs up to high speed and then slows down, then back up, continuing to hunt for the set speed.
SOURCE: 2 1/2 Briggs......doesn't run smoothly....surges at all speeds.
Hi, Check that you have the correct spark plug fitted or fit a new one as it sounds like your plug is getting hot then shorting out.
Sometimes the magnito can do this as well. but I would start with the plug.
SOURCE: Mower not running at set speed, choking
you should have an air/fuel mixture screw on the carb somewhere. Start the engine and turn it one way then the other a small amount at a time. One way it will get worse and one way it will get better. Keep turning till it smooths out
SOURCE: lawn boy 2 cycle mower won't start
Replace the spark plug and retry.
If a new plug does not work push the spring button on the bottom of the carburetor to make sure fresh fuel is in the fuel bowl.
if this does not work remove the spark plug and squirt some light oil (like wd 40) right into the spark plug hole; roll the engine over slowly a couple times using the starter rope. put the plug back in and snap the plug wire in place. If the mower now starts after a couple pulls it means the rings are worn, replace the rings.
Maybe the engine is running with the fuel from the primer bulb (about few seconds), the carburator is not working and need to be removed checked and cleaned, the most common fail is a jet clogged.
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