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Briggs opposed twin blowing out the carb


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#1 CraftsmanGT OFFLINE  

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Posted June 03, 2015 - 01:59 PM

Model 422707. It was running great as always, then started cutting out and wouldn't run with out choke. Figuring it was the carb I pulled it off and gave it a cleaning even though it didn't need it. I put everything back together and same thing, then I noticed it's blowing back out the carb and won't run unless choked or have a hand over the carb to keep all the gas from blowing out. Causes? Fixes? Thanks

#2 WNYTractorTinkerer ONLINE  

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Posted June 03, 2015 - 02:26 PM

Sounds like a sticking Intake valve..  Pull the valve cover to confirm valves are actually closing..  


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#3 superaben OFFLINE  

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Posted June 03, 2015 - 07:30 PM

Do you have new spark plugs?

 

I also fought one with a similar issue that turned out to be bad coils.  However, it would run well sometimes and then die completely other times.

 

Ben W. 



#4 JDBrian OFFLINE  

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Posted June 03, 2015 - 07:34 PM

Maybe running on one cylinder?



#5 CraftsmanGT OFFLINE  

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Posted June 12, 2015 - 02:57 PM

Thank you. I've been busy, I will check it out today



#6 Cvans OFFLINE  

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Posted June 12, 2015 - 07:25 PM

I have to agree with the sticking intake valve. did you notice any screws missing inside the air-cleaner or holding the choke plate to the shaft. These have a habit of getting stuck in the valves. I'm working on a Briggs twin right now where this happened. Usually pull the head and take the screw out from  under the valve and reassemble. Can be under either valve. About 40 minutes and your back on the road again. 


Edited by Cvans, June 12, 2015 - 07:26 PM.





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