In this video I will be showing you how to remove the carburetor, clean it, replace the gaskets, and replace the primer build on a Yardman Y26SS 4-stroke trimmer. A dirty carburetor will cause hard starting, idling issues, problems with staying running, and poor performance. #oemtools #smallengine #trimmer

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Remove the air filter cover. It clips on at the front towards the pull cord side, then pivots on the rear. Unclip it on the pivot as well. As a tip, use your phone to take photos along the way so you’re able to reference the assembly making sure everything is in its correct location.
Remove the foam filter.

Using a torx driver, remove the two fasteners. This holes the air box and carburetor in place. Remove the plastic air box section off the rubber vent line and then remove. Make note of each full line location, then remove using needle nose pliers.

Then disconnect the throttle linkage.

As you can see the primer bulb has dried out and deteriorated. This will cause engine running issues as well and these are fairly cheap to purchase.

Using a Philips screwdriver, remove the primer bulb plate. There will be four screws in total. For the new primer bulb, make sure the diameter of the base is the same, then push it into place.

Those four screws held most of the assembly together. The black plastic piece is the primer base. Next you’ll have the diaphragm with a gasket on the opposite side. The diaphragm will become hard over time and this is what will cause running issues.

To remove the needle, it’s held on with a single phillips screw that keeps the shaft in place holding in the needle lever and spring. Be extremely careful when removing this, the spring is small and can be easily lost.

Once the screw is out, here is the assembly. The components are very small so don’t lose them. Using a carburetor or solvent, spray it through the ports to clean out any dirt or debris. Make sure you’re wearing safety glasses, some of these ports go in opposite directions and you can risk having the cleaner spray back at you. Follow up with compressed air for added pressure to force out any access cleaner or remove any dirt.

Always closely inspect everything ensuring it’s clean. It doesn’t take much to plug up these small carburetors. There is also a fuel filter screen, make sure that is clean as well. You can hold it up to a light or the sky, make sure you can see light through it.

A razor knife can be used to clean off any old gasket buildup. Do not damage the sealing surface. Then clean away any loose material so it’s not in any ports.

Moving onto the main carburetor body, remove the leftover gasket and diaphragm, and don’t forget to note its position. Scrap away any leftover gasket material if needed. For this portion of the carburetor I’m just using compressed air and torch cleaning tips as some solvents can attack the plastic.

Pick the torch cleaning tips which are slightly smaller than the hole, do not force them inside. These tips are abrasive on the sides and can open up the ports, so don’t become too aggressive with them when cleaning. They’re just intended to help move out any light debris that solvents or air cannot get.

Typically these will come as a gasket kit and you may have a couple of different gaskets to select from. Match up the old gaskets with the new ones.

Now is the new diaphragm and you can see how flexible it is.

That diaphragm gets put off to the side while I install the needle with the level and spring. This part takes patience, needle nose pliers can help with putting those components in place. I’ll try to put the spring in its hole, then place the shaft with lever and needle in its place.

Reinstall everything else in reverse of removal.

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