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Discussion Starter · #1 ·
Engine (which is on a Murray mower) starts and runs, but smokes and runs very rough. I think the fuel mix is probably too rich because the engine runs perfectly just before running out of gas in the tank. I have changed spark plug, the gas cap vent is clear and the engine runs the same when the air cleaner is removed.

Could anyone offer any advice as to what the proble might be? There don't seem to be any adjustments on the carb. This mower is a few years old, but has not been used much. I don't know if it relates to the engine problem in any way, but it started doing this just after an oil change.

Engine codes are:
Model: 10A902
Type: 2291 B1
 

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Discussion Starter · #4 ·
Finally got around to working on the engine today. I replaced the carb diaphram and gasket (about $4) and the engine is running great. Thanks for the help.
 
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