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White GT1855 backfiring


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#1 Fdsinozich OFFLINE  

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Posted February 17, 2016 - 03:44 PM

Yesterday started backfiring at low and medium rpm, runs fine at full throttle.
Any ideas?
Thanks

#2 glgrumpy ONLINE  

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Posted February 17, 2016 - 08:08 PM

Air/vacumn leak at carb or intake?  Check bolts in those areas AND, the breather tubes, usually rubber that can split open from oil soaking. OLD, Bad gas? 


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#3 Bill 76 ONLINE  

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Posted February 17, 2016 - 08:10 PM

If it's popping out the carb my guess would be it's running lean at part throttle could be crud in carb or leaking intake gasket --it's running fine at full throttle so I would rule out timing.

I would try a new spark plug first , a bad plug can cause weird things to happen.


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#4 637Yeoman OFFLINE  

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Posted February 17, 2016 - 08:57 PM

Does it start backfiring when shutting down? or just when its running?


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#5 EricFromPa ONLINE  

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Posted February 17, 2016 - 09:36 PM

18hp briggs vanguard V-Twin? Sounds like you might have picked up some water in your gas or the valve lash is set to tight.


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#6 Fdsinozich OFFLINE  

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Posted February 17, 2016 - 10:57 PM

Had the air cleaner off working on the throttle cable. I will check the breather tunes first, then the plugs.
I will let you know.
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#7 Fdsinozich OFFLINE  

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Posted February 18, 2016 - 02:35 PM

Replaced plugs, breather tunes are good, bolts are tight and I have run several tanks through it this week throwing snow.
I will start googling.

#8 EricFromPa ONLINE  

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Posted February 18, 2016 - 03:21 PM

Water and dirt will lay in the bottom of the carb.Pull the top of your carb off and remove the fuel solinoid then spray everything out with Carb and choke cleaner.Let it dry and reassemble.

 

It doesn't take much water or dirt to make it run rough.

 

Valves should be set @ Intake .004-.006  @ exhaust .004-.006  On all OHV Vanguard V-Twin engines.

 

Clean the Carb and Check the valves before spending money on New Coils.

 

Miss firing at lower RPM is a sign of failing Coils according to Briggs troubleshooting manual.



#9 Fdsinozich OFFLINE  

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Posted February 18, 2016 - 04:32 PM

Thanks

#10 Fdsinozich OFFLINE  

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Posted February 18, 2016 - 10:45 PM

I will keep working.
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