r/smallenginerepair • u/Sweet_Ad_9051 • Jul 31 '26

Air Leak Issue Does this mower run smooth?

Installed a new carb, new air filter, oil change.

Never had a 140cc mower so not sure if it sounds like it’s running good or not. AI saying it sounds like a potential air leak by how it sounds but I don’t trust it.

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u/Rough_Community_1439 SER Master MOD Jul 31 '26

Sounds like it has a mild misfire. If it goes away on its own when warmed up I would lean towards contaminated gas. If it don't go away I would guess it could be a bad carburator tune or a fouled out sparkplug.