Purchase a rebuild kit. Take the carb off the engine. Disassemble the carb. Clean the parts with carb cleaner. Reassemble and install then adjust carb (if applicable) while running the engine.
Briggs straitton
I just rebuilt the carb on a Tecumseh 8hp snowblower engine mounted on a Craftsman frame. It was a 1986 model so it has the adjustable main jet and adjustable idle mixture jet. Screw in both jets to just snug, do not over tighten or you will ruin the jet or the carb. Back out the main jet approximately 2 full turns. It is located on the bottom of the carb float bowel. Back the idle mixture adjust jet out 1 1/4 turns. It is located on the side of the carb and can be accessed through an access hole in the side of the carb shield. It is the lower access hole. Start the engine and let it warm up. Fine tune the main jet by screwing it in until the engine runs rough. Now back it out until the engine runs smoothly at high speed without any choke. You should be good to go. If you wish to adjust the engine speed at low speed set the throttle control lever to just above where it enters the kill switch at the bottom. Now you can adjust the low speed idle by adjusting the screw at the top of the carb right next to the throttle butterfly control. It can be accessed through the top access hole in the side of the carb shield. Turn the screw in (to the right) to increase low idle speed and turn out (to the left) to reduce idle speed. Your engine should now run smoothly at both low and high speed.
Adjust carb on 400 Polaris 4x4 2stroke
Surging is often fixed by replacing the fuel filter. A simple job and most small engine shops will have the part.
"84 is still the carb. There is a small screw right at the throttle cable on the carb. Adjust that.
there is a screw on the carb. be sure to adjust while the engine is running so you can tell by the idle when it is set properly.
It is usually above the float in the little bowl at the bottom of the carb.
Check internet for book form 69590, this is techumsehs carb identification, troubleshoot, and service book. Very helpfull!
there is a set screw on the linkage on the carb that will adjust it.
it's the screw right above the mounting bolt on the left rear of the carb. you'll have to adjust the idle screw as well as you lean it out. then check your timing again
Adjust the throttle stop screw located on the side of the carb that has your throttle linkage connected to it.