MOWER USES A LOT OF GAS BACKFIRES SOMETIMES& TRIES TO STOP BUT PICKS BACK UP

Time for preventiv maint chec....inspect batt connects for titeess n corrosion.....clean carb w an outboard product to relieve filth from ethanol gas

If the unit runs too rich, then replace the carb.

Try changing your fuel filter and add injector cleaner to your gas tank

the best thing to do is to clean or replace carb filter.. check spark plug for fouling clean or replace also if gas has been sitting in unit and stored outside I would drain gas because of water contamination..

There are several additives on the market for gasoline, but only a few of them actually help anything. If the additive is relatively cheap to buy, don't expect much results. Gas that hasn't been treated with fuel stabilizer that is a month or more old loses its volatility and can cause issues with engine performance, small and large.
All you guys on the block need to make sure you're using fresh gas, Clean SAE 30 Weight Oil for the Briggs Engines and good clean air filters. Also you can tell when gas is going stale..it starts smelling kind of like turpentine....a smell you'll never forget.

Make sure you have fresh clean fuel in the mower. Has the mower been setting for a while? Make sure your air cleaner is not plugged. Try starting with fresh fuel and the air cleaner off. Let me know if the cord tries to pull back or you have hit anything with the mower blade recently.

it sounds like its the exhaust is blocked up or/and air filter, its the back fire that makes me think its a blocked exhaust,, iv had it before!
try taking it off and starting it up,,,,and yes its going to be noisy if it go's! untill you clean out the pipe, then put it back on again,

It sounds like your timing's off. Take the sheetmetal cowl off and remove the flywheel on top. Check your shear pin and replace if necessary. It sounds like there is some offset there. The shear pin should get you back running right. Best regards, --W/D-- please feel free to rate this solution! Thanx!

it would be a lot easier if you take the cover off the top of lawn mower.
find the carb, it usually sits near gas tank, there should be a screw sticking out of it. tighten until it runs normal. also adjust the air intake/ throttle arm on carb

you may need to change the oil and/or empty the old gas and replace it with new.

This thing happens when you don't take care of your lawn mower for too long.