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I ended up buying a cheap used mower for $25 I the neighborhood. This should get me through a couple seasons, but I still want to fix my mower. My dad bought this for me when I bought my first house, and I want to keep it going.

By idle speed I was referring to the operating speed. I'm sorry for the confusion. It's still bouncing around.

Yes I checked the intake manifold and the tube that runs to the other side, no noticeable cracks and gaskets are all in good shape include the gaskets I just changed. No, the engine still surges if I place the spring tension higher. I'm not having a low idle issue per se, I'm having a idle...

Happy new year everyone! I'm still stuck with a inop mower, and spring time is just around the corner. Any ideas? I'm about to seek out a local repair shop since I'm at a loss.

I'm sorry to confuse, but you are correct, it doesnt have an idle. The normal operation RPM is not being reached because the RPMs are bouncing and keeping the motor running at a lower RPM than normal. When I tried to pull on the spring to get it into the normal RPM range, it still surged and...

Carb cleaning was one of the first things I did when I put on all these new parts. I did that by manually holding tension on the spring, and it did increase the RMPs, but the idle was still bouncing all over the place. I'm lost what to do.

Looks about the same as mine. Mine had no damage, and no signs of bending. I bent it on my own trying to play with the adjustment, but I out it back to where it was originally.

That's what I'm trying to figure out, how do I correct that low/surging idle?

I tried to pull on the spring to readjust it, and I was able to increase the idle speed, but it was still bouncing around. Something else is off with this engine that wont allow it to idle smooth. Any other ideas?

I checked the bolts and they were still tight. Also, the tube doesnt draw air from the carb, but rather the air filter box, so I dont see how this could cause a bouncy idle.

The engine its surrounded by plastic covers that cover the carb and spring area, (removed when I took the video) and they are not damaged, so I think it's safe to say that the tab is not bent.

Are you referring to the manifold on the carburetor itself? I took it off the engine and cleaned everything out, but I didnt notice any obvious cracks. Do you think it's time for a new carb?

I have a Briggs and Stratton 6.25 HP motor on a yard machines lawn mower. The motor will not go up to the operating RPM, It stays at a low rpm and bounces around a lot. I've already replaced the spark plug, clean and disassembled the carburetor, new fuel line, new air filter and screen, And I...