Briggs and Stratton lawnmower carburetor spring comparison

A quick comparison between two very similar Briggs and Stratton motors; one 500 series engine and the other a 550 series.
Taking a quick look at the springs on the carburetors and showing that both run great.
One style of carburetor utilizes an internal governor, the other uses a wind vane dependent on the flywheel (multiple springs).



8 thoughts on “Briggs and Stratton lawnmower carburetor spring comparison

  1. I just picked up one of these for free. It's missing the air filter, housing and screw. Do you know the dimensions of the screw? I've read it's 10/32×3.5 but I'm not sure.

  2. 1:12 on that style mine seems to just flip one of two ways. Is their any way to adjust the idle lower? One way revs high the other way it dies. The spring doesn’t really seem to do much. You’d think it would want to be in the middle position not just flipped all the way open.

  3. I cut the big spring i thought I had slack in the spring so I cut some. I think I made a mistake. It can be fix no bigy

  4. I lost my spring while moving under an apple tree. After that it was idling way too low. I didn't know I was missing a spring so I was adjusting the screw at the back of the engine throttle linkage. it is turned all the way clockwise. I got a new single spring and put that on. now it idles a bit too fast. should I adjust that screw again? I have the same motor as the yellow one in your video.

  5. just to add some info… the mower with one big spring has an internal governor that controls the rpms. and the multiple spring mower has a wind vane governor that is controlled by the air from the flywheel.

  6. I have the one with 1 spring. It's about 3-4 years old. It starts very easy. The problem is engine speeds up and down constantly. Now it acts like it has no power, and the idle needs to be higher. It has new filter and new plug. It smells like it's burning very rich too. Uses more gas than it did when it was new. Any ideas?

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