Rough running B&S Quantum XTE 6 hp

She is an auto-choker. Easy to get running proper. Someone on here had a manual all about the autochoke system. Had lots of great tips in it. Need to look into yours and make sure it's working proper.

Look into the autochoke first. Then if it is working proper, dive into the carb or filthy fuel tank and stock OEM fuel lines that degrade internally.
 
She is an auto-choker. Easy to get running proper. Someone on here had a manual all about the autochoke system. Had lots of great tips in it. Need to look into yours and make sure it's working proper.

Look into the autochoke first. Then if it is working proper, dive into the carb or filthy fuel tank and stock OEM fuel lines that degrade internally.
You are correct! Unfortunately, it’s not an original Briggs carb. My experience with aftermarket on this engine has been hit and miss. Mostly Miss! The main jets tend to be too large.

I believe the original poster is ordering a new aftermarket carb and hopefully it solves the surge
 
This is somewhat common on engines that have sit for a few weeks. The tiny jets in the carb become clogged from a gummy varnish, clogging (or partly clogging) them. This causes the engine to run lean. The engine is starving for fuel and causes the governor to hunt for a steady speed.

Try putting some 'Sea Foam' to your gastank. (I always mix some into my gas containers before filling them at the station.)

Run the engine to draw it in to the carb, then shut the engine off and let it sit. It will slowly disolve the gum. (Had a snow blower carb that had to sit several days to clear up.)

Another possibility (although less common) is a partially clogged fuel filter. (When was filter changed last.)

And even less common are gaskets which have dried out and shrunk; causing small air leaks. Most common is gasket at carb to engine. Try tightening carb screws.)
 
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This is somewhat common on engines that have sit for a few weeks. The tiny jets in the carb become clogged from a gummy varnish, clogging (or partly clogging) them. This causes the engine to run lean. The engine is starving for fuel and causes the governor to hunt for a steady speed.

Try putting some 'Sea Foam' to your gastank. (I always mix some into my gas containers before filling them at the station.)

Run the engine to draw it in to the carb, then shut the engine off and let it sit. It will slowly disolve the gum. (Had a snow blower carb that had to sit several days to clear up.)

Another possibility (although less common) is a partially clogged fuel filter. (When was filter changed last.)

And even less common are gaskets which have dried out and shrunk; causing small air leaks. Most common is gasket at carb to engine. Try tightening carb screws.)
All wisdom! Unfortunately he has a Made in China carburetor that someone installed. I think the original Briggs carburetors are best
 
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