After removing a lawn mower's fuel tank to access the carburetor, the carburetor can be cleaned with a carburetor cleaner or a simple brush. Learn about the importance of ventilation when cleaning a lawn mower's carburetor with help from the owner of a small engine repair shop in this free video on lawn mower repair.
Hi, I'm Mark Bauer at Bauer Small Engine Repair and I'm going to show you how to clean a lawn mower carburetor. I'm going to remove the fuel tank on this model. You just simply slide it up; there's little tabs on the engine that hold the tank in place. You want to take off the clamp. It's, this particular clamp typically will break which is one that; so you want to just take your pliers, slide, take it off. And you can take a pair of needle nose pliers and slide it behind the fuel line and that will enable you to pry it off. You know, if you try to take it off by, by squeezing the fuel line, you're just going to pinch it onto the fitting here and you could damage that fitting. Just simply take the nose and pop that off. You want to take the gas that's in the tank and dispose of it properly. Chances are, their dirt came from the tank so you don't want to reuse that fuel that's in the tank. The next thing you want to do is you can get some carburetor cleaner and just put a little bit on a rug and you want to clean off this ball so you don't; when you take the ball off you don't let dirt fall inside the, the carburetor. So you want to lay it, a rug down and, so you don't get gas everywhere. Simply unscrew that jack, that snug is also a main jack and this gas, this gas smells bad and has a yellowish color. It's, it's, it's stale, so you just loosen it up with the wrench. Once you get it loosen up with the wrench and you can grab it, grab and unscrew it; sometimes it takes two fingers. Alright, the most common failure is this; this is the main jack, main jack slash ball knot and what happens is if this gets a little piece of debris in there in the jack; you can see that little green piece of debris and then there's also piece of the old gas, the gas get that little flake right there and you want to simply, clean that gas, get off of there. Get all the old gas get off, just like that. So you want to make sure that's clean and the way you can do that is just simply get a piece of small wire; let's see and you poke it in and out of that hole; make sure that it's clean. It's really, it's imperative that that hole is clean. So you will run the wire through there and you can also run the wire through this hole in the middle. You want to go down the middle. Just spray a little bit out on there, in, on the jack; just do that and if you don't have a carburetor cleaner you can just make it really clean with just using a brush. The carburetor cleaner is just a, helps get a little bit more of it, a little bit more than off there. And you want to make sure you have adequate ventilation; I have a fan going; I had the window open. The, the overhead garage door is open. This stuff is hazardous, you don't want to breathe that in. Once you're sure you have the main jack clean and just set that aside. Now we're going to take the ball off the carburetor. The ball is, is only held on by that knot; so we're just going to take the ball off; sometimes it get stuck on there. On this one we're going to replace the ball. We're not even going to try to clean that. What I'm going to do now is make sure that the float is moving freely and when you bring it up, it'll have a distinct click and that clicking sound tells me that the needle is sealing on it's seat and that's a good thing. That's what you want. So we're going to take the gasket off and you just get a little screwdriver; in this case I'm using a pick and this gasket is really bad. So I'm going to take this off here. I have a compressed air, so I'm going to use, I'm going to blow it, blow that off. Okay, this is a new bolt or ring; we're going to put this on, on the bolt, on the carburetor. You just get the back on first and then work your finger around to the front; then just make sure it's all the way on. So you put it on the back first and then just simply slide your fingers around and it'll go up into where it's suppose to be. The ball has a deep end to it. One end is shallow, one end is deep. You want to place that shallow end right where the hinge pin is. So you just simply put the ball on there; I'm going to pull that away and now we're going to just get that back in place. Now we're going to tighten our knot. And that's how you clean a carburetor on a lawn mower.