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 Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin.

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craftworks125
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Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Empty
PostSubject: Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin.   Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Icon_minitimeThu May 31, 2012 9:30 am

Hey my motor is a 14hp Briggs Vanguard Vtwin. It is straight piped to under the foot rests and exists in front of the rear tires. This motor has never let me down. My last mudding adventure, one cylinder started misfiring. It strarted doing it when i went through deep mud in 5th gear. It sounds like one cyclinder is working a lot harder than the other when i was going fast in the mud. then i would let out the clutch and they would both have the same tone again. Now i can hear the left cylinder missing at idle. That is the only time i can hear it, it still rips at max RPMs (governed). I am thinking i need to adjust my valves. I am really hoping that is all i need to do. If there is anything else you guys think it could be, please let me know. Thank you
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TheRainbowBoxer
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Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Empty
PostSubject: Re: Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin.   Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Icon_minitimeThu May 31, 2012 10:42 am

If you haven't already, replace the spark plugs... That sounds like how my old 14 horse briggs acted when it was time for a new one (except it was a single so it eventually just died).

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craftworks125
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Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Empty
PostSubject: Re: Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin.   Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Icon_minitimeThu May 31, 2012 11:06 am

i replaced them last fall do you think i still need to replace them?
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Stretch44875
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Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Empty
PostSubject: Re: Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin.   Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Icon_minitimeThu May 31, 2012 11:24 am

Yep.
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craftworks125
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Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Empty
PostSubject: Re: Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin.   Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Icon_minitimeThu May 31, 2012 11:41 am

ok that is easy enough but i should replace both right?
and what would cause this that i need to replace them so soon?
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dked41
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Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Empty
PostSubject: Re: Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin.   Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Icon_minitimeThu May 31, 2012 11:57 am

Yes do both, a little oil can foul them fairly quickly, the plug change is the first step, and easiest, in diagnosing a problem. Start with plugs and see if that takes care of it first.
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craftworks125
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Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Empty
PostSubject: Re: Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin.   Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Icon_minitimeThu May 31, 2012 12:01 pm

couldnt i just switch the plugs and see if the other side misfires?
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TheRainbowBoxer
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Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Empty
PostSubject: Re: Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin.   Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Icon_minitimeThu May 31, 2012 2:21 pm

That's a decent idea for troubleshooting... You probably don't need to replace both at the same time IMHO.

_______________________________________________
Proud member of the Mower Cycle Gang... aka the "Mowrons!"

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craftworks125
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Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Empty
PostSubject: Re: Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin.   Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Icon_minitimeFri Jun 01, 2012 7:36 am

it wasn't the spark plugs. Now it only leads me to think it is is my valves. That or i lost compression, but i am really hoping i can just adjust my valves and it will be fine. The reason i think it is my valves and not like the air filter or carb is becasue it only misfires on one cylinder. Please let me know what you think.
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dked41
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Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Empty
PostSubject: Re: Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin.   Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Icon_minitimeFri Jun 01, 2012 11:25 am

Can you check compression, do you have access to a guage? If both sides are close to the same, valves are probably okay.
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craftworks125
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Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Empty
PostSubject: Re: Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin.   Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Icon_minitimeFri Jun 01, 2012 11:28 am

ya i could probably come up with one i will check that then let you know thank you if they arent the same then would it be the valves?
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dked41
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Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Empty
PostSubject: Re: Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin.   Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Icon_minitimeFri Jun 01, 2012 11:37 am

That is a good possibilty.
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TheRainbowBoxer
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Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Empty
PostSubject: Re: Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin.   Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Icon_minitimeFri Jun 01, 2012 2:00 pm

I all of the years of running these engines, the only valve related issue I have ever encountered was a failed push rod on my 14 horse OHV single cylinder. If it was the same thing on your machine, I would think you'd have nothing from that side at all. Not saying your instinct isn't correct on this, but keep your mind open to other possibilities. Just some friendly advice from a guy who is a troubleshooter by trade Wink

_______________________________________________
Proud member of the Mower Cycle Gang... aka the "Mowrons!"

My build (Chaos is one of 3 built like this)
Chaos Build

The Mower Cycle Gang visited 1puglife in May 2014
Check out the pics and vids!

Haspin 2016 was a blast!  Check out pics and vids here
Haspin 2016 Media thread

Join us for the annual Mowron-fest at Haspin Acres!
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craftworks125
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Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Empty
PostSubject: Re: Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin.   Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Icon_minitimeFri Jun 01, 2012 2:33 pm

thank you very much what could it be then?
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TheRainbowBoxer
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Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Empty
PostSubject: Re: Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin.   Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Icon_minitimeFri Jun 01, 2012 4:07 pm

My guess? More likely a bad coil or something plugged up in the carb than valves.

_______________________________________________
Proud member of the Mower Cycle Gang... aka the "Mowrons!"

My build (Chaos is one of 3 built like this)
Chaos Build

The Mower Cycle Gang visited 1puglife in May 2014
Check out the pics and vids!

Haspin 2016 was a blast!  Check out pics and vids here
Haspin 2016 Media thread

Join us for the annual Mowron-fest at Haspin Acres!
Haspin Acres Rally 2019!

Check out my YouTube for more tractor action, my vlog, and my bus build!
TheRainbowBoxer on YouTube
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Stretch44875
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Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Empty
PostSubject: Re: Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin.   Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Icon_minitimeFri Jun 01, 2012 11:22 pm

You need some basic things for any engine to run.

Spark
Spark timing
compression
gas

If you have those, it will run. Unless you have too much gas, or something along those lines.

You have gas.
Compression, pull both plugs and put your finger over the hole while starting. See if both holes feel like they are pushing the same amount of air out.
Spark timing is right, otherwise the other cylinder would not fire.
Even if the spark plug is sparking outside of the engine, it may not fire under compression when installed.

First thing I would do is put new plugs in, regardless of how old they are. Plugs go bad.
If it is still missing, I would suspect the coil is shot.

Good luck
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dked41
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Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Empty
PostSubject: Re: Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin.   Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Icon_minitimeSat Jun 02, 2012 12:03 pm

Does this engine have coils, or electronic ignition system?
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craftworks125
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Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Empty
PostSubject: Re: Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin.   Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Icon_minitimeSat Jun 02, 2012 9:39 pm

it has coils
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PostSubject: Re: Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin.   Misfiring on one cylinder on my 14hp Briggs Vanguard Vtwin. Icon_minitime

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