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 plz i need help back fire thro carb

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Poulanmowerman
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PostSubject: plz i need help back fire thro carb   plz i need help  back fire thro carb Icon_minitimeSun Dec 08, 2013 3:58 pm

my 16.5 ic briggs engine back fires thro the carb and when i let off choke it dies plz help i ajusted the valves to factory setting so idk plz help
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TroyBilt Pony
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PostSubject: Re: plz i need help back fire thro carb   plz i need help  back fire thro carb Icon_minitimeSun Dec 08, 2013 4:22 pm

Is it an opposed or OHV or vtwin? It could be alot of things depending on the engine..
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Poulanmowerman
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PostSubject: Re: plz i need help back fire thro carb   plz i need help  back fire thro carb Icon_minitimeSun Dec 08, 2013 4:43 pm

ohv
it also spits up 0
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Doc Sprocket
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PostSubject: Re: plz i need help back fire thro carb   plz i need help  back fire thro carb Icon_minitimeSun Dec 08, 2013 4:57 pm

Sounds to me like you have a number of issues to deal with.

The backfiring can be caused by a number of things. Valve or ignition timing could be off, could have a sticky valve, too. The choke deal is usually a clogged carb, but could be symptomatic of whatever is causing the backfiring.

Let's start here-

How long have you had the engine, how long has it been doing it, and did you do enything to the engine right before the problems started?

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plz i need help  back fire thro carb Facebo12
Put down the wrench, and come out with your hands up!-Doc "Tranny Crusher" Sprocket, ATLTF Forum Admin, Thinkerer and Tinkerer, and all-around good dood. Wink

Gen. Mayhem- https://www.atltf.com/t2597-general-mayhem-race-tractor
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MULEII- https://www.atltf.com/t3328-1970-john-deere-112-the-beginnings-of-mule-ii
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Poulanmowerman
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PostSubject: Re: plz i need help back fire thro carb   plz i need help  back fire thro carb Icon_minitimeSun Dec 08, 2013 5:06 pm

i have had the engine for like 4 months when i got it it smoked i chaged the oil and adjusted the valves it ran good i also resently put 2 cycle gas in it and stated it it started back fireing i cought my self draind the gas and put fresh gas in it and its still back fireing through the carb and spiting up im stumped its a great engine but it seems to always has a prob
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Poulanmowerman
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PostSubject: Re: plz i need help back fire thro carb   plz i need help  back fire thro carb Icon_minitimeSun Dec 08, 2013 5:26 pm

i talked to my dad he had a small engine shop he said fly wheel key i will start with that
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Doc Sprocket
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PostSubject: Re: plz i need help back fire thro carb   plz i need help  back fire thro carb Icon_minitimeSun Dec 08, 2013 5:59 pm

The timing key is indeed something to look at. Have you have the flywheel off at any point?

FWIW- running a 2-cycle mix thru your engine will NOT cause any short-term damage. At the very worst, it will foul the plug after an extended period of time.

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plz i need help  back fire thro carb Facebo12
Put down the wrench, and come out with your hands up!-Doc "Tranny Crusher" Sprocket, ATLTF Forum Admin, Thinkerer and Tinkerer, and all-around good dood. Wink

Gen. Mayhem- https://www.atltf.com/t2597-general-mayhem-race-tractor
MULE- https://www.atltf.com/t2153-lawn-boy-utltv
MULEII- https://www.atltf.com/t3328-1970-john-deere-112-the-beginnings-of-mule-ii
MULEIII https://www.atltf.com/t4263-mule3-brainstorming-ideas-etc#58287
Wrench, Wheel, Wreck, Repeat...
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TroyBilt Pony
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PostSubject: Re: plz i need help back fire thro carb   plz i need help  back fire thro carb Icon_minitimeSun Dec 08, 2013 6:04 pm

@Doc Sprocket wrote:
The timing key is indeed something to look at. Have you have the flywheel off at any point?

FWIW- running a 2-cycle mix thru your engine will NOT cause any short-term damage. At the very worst, it will foul the plug after an extended period of time.
Ive been told running mix every 6 months or so is actually good for the carb and valvetrain..
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Doc Sprocket
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PostSubject: Re: plz i need help back fire thro carb   plz i need help  back fire thro carb Icon_minitimeSun Dec 08, 2013 6:47 pm

Yeah- I dunno. You hear all kinda of stuff that is supposed to help, such as burning ATF periodically.

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plz i need help  back fire thro carb Facebo12
Put down the wrench, and come out with your hands up!-Doc "Tranny Crusher" Sprocket, ATLTF Forum Admin, Thinkerer and Tinkerer, and all-around good dood. Wink

Gen. Mayhem- https://www.atltf.com/t2597-general-mayhem-race-tractor
MULE- https://www.atltf.com/t2153-lawn-boy-utltv
MULEII- https://www.atltf.com/t3328-1970-john-deere-112-the-beginnings-of-mule-ii
MULEIII https://www.atltf.com/t4263-mule3-brainstorming-ideas-etc#58287
Wrench, Wheel, Wreck, Repeat...
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Poulanmowerman
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PostSubject: Re: plz i need help back fire thro carb   plz i need help  back fire thro carb Icon_minitimeSun Dec 08, 2013 6:55 pm

Yup the key is almost sheerd all the way off thanks for your time this off roader will be back on the train in no time thanks god bless
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Poulanmowerman
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PostSubject: Re: plz i need help back fire thro carb   plz i need help  back fire thro carb Icon_minitimeSun Dec 08, 2013 6:55 pm

Trail I meen
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willis923
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PostSubject: Re: plz i need help back fire thro carb   plz i need help  back fire thro carb Icon_minitimeSun Dec 08, 2013 7:06 pm

if it still does it after you replace the key, you might have to clean the carb

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plz i need help  back fire thro carb Pbucket

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Doc Sprocket
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PostSubject: Re: plz i need help back fire thro carb   plz i need help  back fire thro carb Icon_minitimeSun Dec 08, 2013 7:14 pm

Now remember- and this is CRITICAL- after replacing that timing key, torque the nut to 150 lbs/ft. Undertighten it, and it will shear again. Seen it a million times.

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plz i need help  back fire thro carb Facebo12
Put down the wrench, and come out with your hands up!-Doc "Tranny Crusher" Sprocket, ATLTF Forum Admin, Thinkerer and Tinkerer, and all-around good dood. Wink

Gen. Mayhem- https://www.atltf.com/t2597-general-mayhem-race-tractor
MULE- https://www.atltf.com/t2153-lawn-boy-utltv
MULEII- https://www.atltf.com/t3328-1970-john-deere-112-the-beginnings-of-mule-ii
MULEIII https://www.atltf.com/t4263-mule3-brainstorming-ideas-etc#58287
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Poulanmowerman
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PostSubject: Re: plz i need help back fire thro carb   plz i need help  back fire thro carb Icon_minitimeSun Dec 08, 2013 7:26 pm

Ok thanks
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T-Dub13
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PostSubject: Re: plz i need help back fire thro carb   plz i need help  back fire thro carb Icon_minitimeMon Dec 09, 2013 10:02 am

Keep in mind that keys don't just shear for no reason. An improperly torqued flywheel is usually the culprit (which will be fixed when you re-assemble), BUT take a moment to think about the motor as a system and how it was running when it first got the problem. You may uncover a different cause which should be fixed or you will keep having the same problem. Lean running or an intermittent Switch or coil or plug could cause the motor to fire at the wrong time and shear a key.... Good luck!
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Poulanmowerman
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PostSubject: Re: plz i need help back fire thro carb   plz i need help  back fire thro carb Icon_minitimeMon Dec 09, 2013 7:02 pm

I put a new key in tried to start it nothing it sounded like the valves where staying shut looked at the rockers and the valve clearence was way off than it started than quickly shut off wasn't starting checked the plug no spark changed it out did a little carb ajusting runs like a top
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Doc Sprocket
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PostSubject: Re: plz i need help back fire thro carb   plz i need help  back fire thro carb Icon_minitimeMon Dec 09, 2013 7:17 pm

While your description would seriously benefit from some punctuation, glad you got it sorted out.

By the way- Didn't you say in your first post that you'd already adjusted the valve lash?

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***Get YOUR official "Doc Locked, And Ready To Rock!" Stickers by clicking here!***
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plz i need help  back fire thro carb Facebo12
Put down the wrench, and come out with your hands up!-Doc "Tranny Crusher" Sprocket, ATLTF Forum Admin, Thinkerer and Tinkerer, and all-around good dood. Wink

Gen. Mayhem- https://www.atltf.com/t2597-general-mayhem-race-tractor
MULE- https://www.atltf.com/t2153-lawn-boy-utltv
MULEII- https://www.atltf.com/t3328-1970-john-deere-112-the-beginnings-of-mule-ii
MULEIII https://www.atltf.com/t4263-mule3-brainstorming-ideas-etc#58287
Wrench, Wheel, Wreck, Repeat...
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PostSubject: Re: plz i need help back fire thro carb   plz i need help  back fire thro carb Icon_minitimeMon Dec 09, 2013 8:05 pm

@Doc Sprocket wrote:
By the way- Didn't you say in your first post that you'd already adjusted the valve lash?
^^^^
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