plz i need help back fire thro carb

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

Is it an opposed or OHV or vtwin? It could be alot of things depending on the engine..

ohv
it also spits up 0

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?

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

i talked to my dad he had a small engine shop he said fly wheel key i will start with that

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.

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..

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

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

Trail I meen

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

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.

Ok thanks

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!

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

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?

Doc Sprocket wrote:

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

^^^^