New mower cutting out when warm after 1st oil change

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  #1  
Old 09-19-13, 04:37 PM
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Red face New mower cutting out when warm after 1st oil change

Hi,
I have a new (3 month old) Craftsman mower w 7.25 hp briggs n stratton platinum engine. Mower is model 917.370921.

The oil was a little dirty so I changed it and the new oil is a tiny bit over the high mark.

Then I added gas and now it runs for 1 minutes, then cuts out in about 1-2 seconds. I tried the easy stuff based on other posts (new sparkplug and loosen gas cap). But no luck.

I'm not real mechanical, so before I start messing w the carb, i thought I'd get some more input.

More info on the mower - it is a simple pull bar and it starts. No choke or primer

Thanks,
John
 
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  #2  
Old 09-19-13, 05:54 PM
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Check the air filter, it may have gotten soaked with gas and/or oil while the mower was tilted.
 
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Old 09-19-13, 05:57 PM
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Bring it back.
Why would you need to do it? It's still under warranty.
 
  #4  
Old 09-20-13, 01:57 PM
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Generally you change mower oil after the first 5 or 10 hours of operation (consult your manual) to get rid of metal shavings from manufacturing. After that, it's once a year or after x number of hours.

Gasses combine with the oil which gives it that dark color. This is normal and does not require a change, the oil absorbs it while retaining its lubricity.

Now that you've done your first change, change it at the beginning of every season and you should be good to go. If you use it commercially, follow the recommendation in the OM.
 
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Old 09-21-13, 04:06 PM
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Thanks Cheese - The air filter is clean and dry.

Re taking it back - I did consider that, but wanted to make sure i wasnt the culprit. Also, the spark plug looked a lot worse than I expected, almost like it had been burning too hot. I cleaned it, then replaced it when cleaning didnt work. The 2nd one didnt help either. Both were unusual to me )1st had very small post, 2nd had a V over the post. Replaced w old style RJ19LM after reading the newer one malfunctions a lot and can be substituted.
 
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Old 09-21-13, 10:52 PM
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Well, the choke opens when it warms up, so there is likely a fuel issue in the carb. If it's dirt or water in the carb, then the bill will probably be on you.
 
  #7  
Old 09-22-13, 06:34 PM
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Ok thanks. I dont always remember to cover it up after it cools down, so water is certainly a possibility.
 
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